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  <div class="section" id="argparse-tutorial">
<h1>Argparse Tutorial<a class="headerlink" href="#argparse-tutorial" title="Permalink to this headline">¶</a></h1>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">author:</th><td class="field-body">Tshepang Lekhonkhobe</td>
</tr>
</tbody>
</table>
<p id="id1">This tutorial is intended to be a gentle introduction to <a class="reference internal" href="../library/argparse.html#module-argparse" title="argparse: Command-line option and argument parsing library."><tt class="xref py py-mod docutils literal"><span class="pre">argparse</span></tt></a>, the
recommended command-line parsing module in the Python standard library.</p>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last">There are two other modules that fulfill the same task, namely
<a class="reference internal" href="../library/getopt.html#module-getopt" title="getopt: Portable parser for command line options; support both short and long option names."><tt class="xref py py-mod docutils literal"><span class="pre">getopt</span></tt></a> (an equivalent for <tt class="xref c c-func docutils literal"><span class="pre">getopt()</span></tt> from the C
language) and the deprecated <a class="reference internal" href="../library/optparse.html#module-optparse" title="optparse: Command-line option parsing library. (deprecated)"><tt class="xref py py-mod docutils literal"><span class="pre">optparse</span></tt></a>.
Note also that <a class="reference internal" href="../library/argparse.html#module-argparse" title="argparse: Command-line option and argument parsing library."><tt class="xref py py-mod docutils literal"><span class="pre">argparse</span></tt></a> is based on <a class="reference internal" href="../library/optparse.html#module-optparse" title="optparse: Command-line option parsing library. (deprecated)"><tt class="xref py py-mod docutils literal"><span class="pre">optparse</span></tt></a>,
and therefore very similar in terms of usage.</p>
</div>
<div class="section" id="concepts">
<h2>Concepts<a class="headerlink" href="#concepts" title="Permalink to this headline">¶</a></h2>
<p>Let&#8217;s show the sort of functionality that we are going to explore in this
introductory tutorial by making use of the <strong class="command">ls</strong> command:</p>
<div class="highlight-sh"><div class="highlight"><pre><span class="nv">$ </span>ls
cpython  devguide  prog.py  pypy  rm-unused-function.patch
<span class="nv">$ </span>ls pypy
ctypes_configure  demo  dotviewer  include  lib_pypy  lib-python ...
<span class="nv">$ </span>ls -l
total 20
drwxr-xr-x 19 wena wena 4096 Feb 18 18:51 cpython
drwxr-xr-x  4 wena wena 4096 Feb  8 12:04 devguide
-rwxr-xr-x  1 wena wena  535 Feb 19 00:05 prog.py
drwxr-xr-x 14 wena wena 4096 Feb  7 00:59 pypy
-rw-r--r--  1 wena wena  741 Feb 18 01:01 rm-unused-function.patch
<span class="nv">$ </span>ls --help
Usage: ls <span class="o">[</span>OPTION<span class="o">]</span>... <span class="o">[</span>FILE<span class="o">]</span>...
List information about the FILEs <span class="o">(</span>the current directory by default<span class="o">)</span>.
Sort entries alphabetically <span class="k">if </span>none of -cftuvSUX nor --sort is specified.
...
</pre></div>
</div>
<p>A few concepts we can learn from the four commands:</p>
<ul class="simple">
<li>The <strong class="command">ls</strong> command is useful when run without any options at all. It defaults
to displaying the contents of the current directory.</li>
<li>If we want beyond what it provides by default, we tell it a bit more. In
this case, we want it to display a different directory, <tt class="docutils literal"><span class="pre">pypy</span></tt>.
What we did is specify what is known as a positional argument. It&#8217;s named so
because the program should know what to do with the value, solely based on
where it appears on the command line. This concept is more relevant
to a command like <strong class="command">cp</strong>, whose most basic usage is <tt class="docutils literal"><span class="pre">cp</span> <span class="pre">SRC</span> <span class="pre">DEST</span></tt>.
The first position is <em>what you want copied,</em> and the second
position is <em>where you want it copied to</em>.</li>
<li>Now, say we want to change behaviour of the program. In our example,
we display more info for each file instead of just showing the file names.
The <tt class="docutils literal"><span class="pre">-l</span></tt> in that case is known as an optional argument.</li>
<li>That&#8217;s a snippet of the help text. It&#8217;s very useful in that you can
come across a program you have never used before, and can figure out
how it works simply by reading it&#8217;s help text.</li>
</ul>
</div>
<div class="section" id="the-basics">
<h2>The basics<a class="headerlink" href="#the-basics" title="Permalink to this headline">¶</a></h2>
<p>Let us start with a very simple example which does (almost) nothing:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="kn">import</span> <span class="nn">argparse</span>
<span class="n">parser</span> <span class="o">=</span> <span class="n">argparse</span><span class="o">.</span><span class="n">ArgumentParser</span><span class="p">()</span>
<span class="n">parser</span><span class="o">.</span><span class="n">parse_args</span><span class="p">()</span>
</pre></div>
</div>
<p>Following is a result of running the code:</p>
<div class="highlight-sh"><div class="highlight"><pre><span class="nv">$ </span>python prog.py
<span class="nv">$ </span>python prog.py --help
usage: prog.py <span class="o">[</span>-h<span class="o">]</span>

optional arguments:
  -h, --help  show this <span class="nb">help </span>message and <span class="nb">exit</span>
<span class="nv">$ </span>python prog.py --verbose
usage: prog.py <span class="o">[</span>-h<span class="o">]</span>
prog.py: error: unrecognized arguments: --verbose
<span class="nv">$ </span>python prog.py foo
usage: prog.py <span class="o">[</span>-h<span class="o">]</span>
prog.py: error: unrecognized arguments: foo
</pre></div>
</div>
<p>Here is what is happening:</p>
<ul class="simple">
<li>Running the script without any options results in nothing displayed to
stdout. Not so useful.</li>
<li>The second one starts to display the usefulness of the <a class="reference internal" href="../library/argparse.html#module-argparse" title="argparse: Command-line option and argument parsing library."><tt class="xref py py-mod docutils literal"><span class="pre">argparse</span></tt></a>
module. We have done almost nothing, but already we get a nice help message.</li>
<li>The <tt class="docutils literal"><span class="pre">--help</span></tt> option, which can also be shortened to <tt class="docutils literal"><span class="pre">-h</span></tt>, is the only
option we get for free (i.e. no need to specify it). Specifying anything
else results in an error. But even then, we do get a useful usage message,
also for free.</li>
</ul>
</div>
<div class="section" id="introducing-positional-arguments">
<h2>Introducing Positional arguments<a class="headerlink" href="#introducing-positional-arguments" title="Permalink to this headline">¶</a></h2>
<p>An example:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="kn">import</span> <span class="nn">argparse</span>
<span class="n">parser</span> <span class="o">=</span> <span class="n">argparse</span><span class="o">.</span><span class="n">ArgumentParser</span><span class="p">()</span>
<span class="n">parser</span><span class="o">.</span><span class="n">add_argument</span><span class="p">(</span><span class="s">&quot;echo&quot;</span><span class="p">)</span>
<span class="n">args</span> <span class="o">=</span> <span class="n">parser</span><span class="o">.</span><span class="n">parse_args</span><span class="p">()</span>
<span class="k">print</span> <span class="n">args</span><span class="o">.</span><span class="n">echo</span>
</pre></div>
</div>
<p>And running the code:</p>
<div class="highlight-sh"><div class="highlight"><pre><span class="nv">$ </span>python prog.py
usage: prog.py <span class="o">[</span>-h<span class="o">]</span> <span class="nb">echo</span>
prog.py: error: the following arguments are required: <span class="nb">echo</span>
<span class="nv">$ </span>python prog.py --help
usage: prog.py <span class="o">[</span>-h<span class="o">]</span> <span class="nb">echo</span>

positional arguments:
  <span class="nb">echo</span>

optional arguments:
  -h, --help  show this <span class="nb">help </span>message and <span class="nb">exit</span>
<span class="nv">$ </span>python prog.py foo
foo
</pre></div>
</div>
<p>Here is what&#8217;s happening:</p>
<ul class="simple">
<li>We&#8217;ve added the <tt class="xref py py-meth docutils literal"><span class="pre">add_argument()</span></tt> method, which is what we use to specify
which command-line options the program is willing to accept. In this case,
I&#8217;ve named it <tt class="docutils literal"><span class="pre">echo</span></tt> so that it&#8217;s in line with its function.</li>
<li>Calling our program now requires us to specify an option.</li>
<li>The <tt class="xref py py-meth docutils literal"><span class="pre">parse_args()</span></tt> method actually returns some data from the
options specified, in this case, <tt class="docutils literal"><span class="pre">echo</span></tt>.</li>
<li>The variable is some form of &#8216;magic&#8217; that <a class="reference internal" href="../library/argparse.html#module-argparse" title="argparse: Command-line option and argument parsing library."><tt class="xref py py-mod docutils literal"><span class="pre">argparse</span></tt></a> performs for free
(i.e. no need to specify which variable that value is stored in).
You will also notice that its name matches the string argument given
to the method, <tt class="docutils literal"><span class="pre">echo</span></tt>.</li>
</ul>
<p>Note however that, although the help display looks nice and all, it currently
is not as helpful as it can be. For example we see that we got <tt class="docutils literal"><span class="pre">echo</span></tt> as a
positional argument, but we don&#8217;t know what it does, other than by guessing or
by reading the source code. So, let&#8217;s make it a bit more useful:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="kn">import</span> <span class="nn">argparse</span>
<span class="n">parser</span> <span class="o">=</span> <span class="n">argparse</span><span class="o">.</span><span class="n">ArgumentParser</span><span class="p">()</span>
<span class="n">parser</span><span class="o">.</span><span class="n">add_argument</span><span class="p">(</span><span class="s">&quot;echo&quot;</span><span class="p">,</span> <span class="n">help</span><span class="o">=</span><span class="s">&quot;echo the string you use here&quot;</span><span class="p">)</span>
<span class="n">args</span> <span class="o">=</span> <span class="n">parser</span><span class="o">.</span><span class="n">parse_args</span><span class="p">()</span>
<span class="k">print</span> <span class="n">args</span><span class="o">.</span><span class="n">echo</span>
</pre></div>
</div>
<p>And we get:</p>
<div class="highlight-sh"><div class="highlight"><pre><span class="nv">$ </span>python prog.py -h
usage: prog.py <span class="o">[</span>-h<span class="o">]</span> <span class="nb">echo</span>

positional arguments:
  <span class="nb">echo        echo </span>the string you use here

optional arguments:
  -h, --help  show this <span class="nb">help </span>message and <span class="nb">exit</span>
</pre></div>
</div>
<p>Now, how about doing something even more useful:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="kn">import</span> <span class="nn">argparse</span>
<span class="n">parser</span> <span class="o">=</span> <span class="n">argparse</span><span class="o">.</span><span class="n">ArgumentParser</span><span class="p">()</span>
<span class="n">parser</span><span class="o">.</span><span class="n">add_argument</span><span class="p">(</span><span class="s">&quot;square&quot;</span><span class="p">,</span> <span class="n">help</span><span class="o">=</span><span class="s">&quot;display a square of a given number&quot;</span><span class="p">)</span>
<span class="n">args</span> <span class="o">=</span> <span class="n">parser</span><span class="o">.</span><span class="n">parse_args</span><span class="p">()</span>
<span class="k">print</span> <span class="n">args</span><span class="o">.</span><span class="n">square</span><span class="o">**</span><span class="mi">2</span>
</pre></div>
</div>
<p>Following is a result of running the code:</p>
<div class="highlight-sh"><div class="highlight"><pre><span class="nv">$ </span>python prog.py 4
Traceback <span class="o">(</span>most recent call last<span class="o">)</span>:
  File <span class="s2">&quot;prog.py&quot;</span>, line 5, in &lt;module&gt;
    print args.square**2
TypeError: unsupported operand <span class="nb">type</span><span class="o">(</span>s<span class="o">)</span> <span class="k">for</span> ** or pow<span class="o">()</span>: <span class="s1">&#39;str&#39;</span> and <span class="s1">&#39;int&#39;</span>
</pre></div>
</div>
<p>That didn&#8217;t go so well. That&#8217;s because <a class="reference internal" href="../library/argparse.html#module-argparse" title="argparse: Command-line option and argument parsing library."><tt class="xref py py-mod docutils literal"><span class="pre">argparse</span></tt></a> treats the options we
give it as strings, unless we tell it otherwise. So, let&#8217;s tell
<a class="reference internal" href="../library/argparse.html#module-argparse" title="argparse: Command-line option and argument parsing library."><tt class="xref py py-mod docutils literal"><span class="pre">argparse</span></tt></a> to treat that input as an integer:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="kn">import</span> <span class="nn">argparse</span>
<span class="n">parser</span> <span class="o">=</span> <span class="n">argparse</span><span class="o">.</span><span class="n">ArgumentParser</span><span class="p">()</span>
<span class="n">parser</span><span class="o">.</span><span class="n">add_argument</span><span class="p">(</span><span class="s">&quot;square&quot;</span><span class="p">,</span> <span class="n">help</span><span class="o">=</span><span class="s">&quot;display a square of a given number&quot;</span><span class="p">,</span>
                    <span class="nb">type</span><span class="o">=</span><span class="nb">int</span><span class="p">)</span>
<span class="n">args</span> <span class="o">=</span> <span class="n">parser</span><span class="o">.</span><span class="n">parse_args</span><span class="p">()</span>
<span class="k">print</span> <span class="n">args</span><span class="o">.</span><span class="n">square</span><span class="o">**</span><span class="mi">2</span>
</pre></div>
</div>
<p>Following is a result of running the code:</p>
<div class="highlight-sh"><div class="highlight"><pre><span class="nv">$ </span>python prog.py 4
16
<span class="nv">$ </span>python prog.py four
usage: prog.py <span class="o">[</span>-h<span class="o">]</span> square
prog.py: error: argument square: invalid int value: <span class="s1">&#39;four&#39;</span>
</pre></div>
</div>
<p>That went well. The program now even helpfully quits on bad illegal input
before proceeding.</p>
</div>
<div class="section" id="introducing-optional-arguments">
<h2>Introducing Optional arguments<a class="headerlink" href="#introducing-optional-arguments" title="Permalink to this headline">¶</a></h2>
<p>So far we, have been playing with positional arguments. Let us
have a look on how to add optional ones:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="kn">import</span> <span class="nn">argparse</span>
<span class="n">parser</span> <span class="o">=</span> <span class="n">argparse</span><span class="o">.</span><span class="n">ArgumentParser</span><span class="p">()</span>
<span class="n">parser</span><span class="o">.</span><span class="n">add_argument</span><span class="p">(</span><span class="s">&quot;--verbosity&quot;</span><span class="p">,</span> <span class="n">help</span><span class="o">=</span><span class="s">&quot;increase output verbosity&quot;</span><span class="p">)</span>
<span class="n">args</span> <span class="o">=</span> <span class="n">parser</span><span class="o">.</span><span class="n">parse_args</span><span class="p">()</span>
<span class="k">if</span> <span class="n">args</span><span class="o">.</span><span class="n">verbosity</span><span class="p">:</span>
    <span class="k">print</span> <span class="s">&quot;verbosity turned on&quot;</span>
</pre></div>
</div>
<p>And the output:</p>
<div class="highlight-sh"><div class="highlight"><pre><span class="nv">$ </span>python prog.py --verbosity 1
verbosity turned on
<span class="nv">$ </span>python prog.py
<span class="nv">$ </span>python prog.py --help
usage: prog.py <span class="o">[</span>-h<span class="o">]</span> <span class="o">[</span>--verbosity VERBOSITY<span class="o">]</span>

optional arguments:
  -h, --help            show this <span class="nb">help </span>message and <span class="nb">exit</span>
  --verbosity VERBOSITY
                        increase output verbosity
<span class="nv">$ </span>python prog.py --verbosity
usage: prog.py <span class="o">[</span>-h<span class="o">]</span> <span class="o">[</span>--verbosity VERBOSITY<span class="o">]</span>
prog.py: error: argument --verbosity: expected one argument
</pre></div>
</div>
<p>Here is what is happening:</p>
<ul class="simple">
<li>The program is written so as to display something when <tt class="docutils literal"><span class="pre">--verbosity</span></tt> is
specified and display nothing when not.</li>
<li>To show that the option is actually optional, there is no error when running
the program without it. Note that by default, if an optional argument isn&#8217;t
used, the relevant variable, in this case <tt class="xref py py-attr docutils literal"><span class="pre">args.verbosity</span></tt>, is
given <tt class="docutils literal"><span class="pre">None</span></tt> as a value, which is the reason it fails the truth
test of the <a class="reference internal" href="../reference/compound_stmts.html#if"><tt class="xref std std-keyword docutils literal"><span class="pre">if</span></tt></a> statement.</li>
<li>The help message is a bit different.</li>
<li>When using the <tt class="docutils literal"><span class="pre">--verbosity</span></tt> option, one must also specify some value,
any value.</li>
</ul>
<p>The above example accepts arbitrary integer values for <tt class="docutils literal"><span class="pre">--verbosity</span></tt>, but for
our simple program, only two values are actually useful, <tt class="docutils literal"><span class="pre">True</span></tt> or <tt class="docutils literal"><span class="pre">False</span></tt>.
Let&#8217;s modify the code accordingly:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="kn">import</span> <span class="nn">argparse</span>
<span class="n">parser</span> <span class="o">=</span> <span class="n">argparse</span><span class="o">.</span><span class="n">ArgumentParser</span><span class="p">()</span>
<span class="n">parser</span><span class="o">.</span><span class="n">add_argument</span><span class="p">(</span><span class="s">&quot;--verbose&quot;</span><span class="p">,</span> <span class="n">help</span><span class="o">=</span><span class="s">&quot;increase output verbosity&quot;</span><span class="p">,</span>
                    <span class="n">action</span><span class="o">=</span><span class="s">&quot;store_true&quot;</span><span class="p">)</span>
<span class="n">args</span> <span class="o">=</span> <span class="n">parser</span><span class="o">.</span><span class="n">parse_args</span><span class="p">()</span>
<span class="k">if</span> <span class="n">args</span><span class="o">.</span><span class="n">verbose</span><span class="p">:</span>
   <span class="k">print</span> <span class="s">&quot;verbosity turned on&quot;</span>
</pre></div>
</div>
<p>And the output:</p>
<div class="highlight-sh"><div class="highlight"><pre><span class="nv">$ </span>python prog.py --verbose
verbosity turned on
<span class="nv">$ </span>python prog.py --verbose 1
usage: prog.py <span class="o">[</span>-h<span class="o">]</span> <span class="o">[</span>--verbose<span class="o">]</span>
prog.py: error: unrecognized arguments: 1
<span class="nv">$ </span>python prog.py --help
usage: prog.py <span class="o">[</span>-h<span class="o">]</span> <span class="o">[</span>--verbose<span class="o">]</span>

optional arguments:
  -h, --help  show this <span class="nb">help </span>message and <span class="nb">exit</span>
  --verbose   increase output verbosity
</pre></div>
</div>
<p>Here is what is happening:</p>
<ul class="simple">
<li>The option is now more of a flag than something that requires a value.
We even changed the name of the option to match that idea.
Note that we now specify a new keyword, <tt class="docutils literal"><span class="pre">action</span></tt>, and give it the value
<tt class="docutils literal"><span class="pre">&quot;store_true&quot;</span></tt>. This means that, if the option is specified,
assign the value <tt class="docutils literal"><span class="pre">True</span></tt> to <tt class="xref py py-data docutils literal"><span class="pre">args.verbose</span></tt>.
Not specifying it implies <tt class="docutils literal"><span class="pre">False</span></tt>.</li>
<li>It complains when you specify a value, in true spirit of what flags
actually are.</li>
<li>Notice the different help text.</li>
</ul>
<div class="section" id="short-options">
<h3>Short options<a class="headerlink" href="#short-options" title="Permalink to this headline">¶</a></h3>
<p>If you are familiar with command line usage,
you will notice that I haven&#8217;t yet touched on the topic of short
versions of the options. It&#8217;s quite simple:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="kn">import</span> <span class="nn">argparse</span>
<span class="n">parser</span> <span class="o">=</span> <span class="n">argparse</span><span class="o">.</span><span class="n">ArgumentParser</span><span class="p">()</span>
<span class="n">parser</span><span class="o">.</span><span class="n">add_argument</span><span class="p">(</span><span class="s">&quot;-v&quot;</span><span class="p">,</span> <span class="s">&quot;--verbose&quot;</span><span class="p">,</span> <span class="n">help</span><span class="o">=</span><span class="s">&quot;increase output verbosity&quot;</span><span class="p">,</span>
                    <span class="n">action</span><span class="o">=</span><span class="s">&quot;store_true&quot;</span><span class="p">)</span>
<span class="n">args</span> <span class="o">=</span> <span class="n">parser</span><span class="o">.</span><span class="n">parse_args</span><span class="p">()</span>
<span class="k">if</span> <span class="n">args</span><span class="o">.</span><span class="n">verbose</span><span class="p">:</span>
    <span class="k">print</span> <span class="s">&quot;verbosity turned on&quot;</span>
</pre></div>
</div>
<p>And here goes:</p>
<div class="highlight-sh"><div class="highlight"><pre><span class="nv">$ </span>python prog.py -v
verbosity turned on
<span class="nv">$ </span>python prog.py --help
usage: prog.py <span class="o">[</span>-h<span class="o">]</span> <span class="o">[</span>-v<span class="o">]</span>

optional arguments:
  -h, --help     show this <span class="nb">help </span>message and <span class="nb">exit</span>
  -v, --verbose  increase output verbosity
</pre></div>
</div>
<p>Note that the new ability is also reflected in the help text.</p>
</div>
</div>
<div class="section" id="combining-positional-and-optional-arguments">
<h2>Combining Positional and Optional arguments<a class="headerlink" href="#combining-positional-and-optional-arguments" title="Permalink to this headline">¶</a></h2>
<p>Our program keeps growing in complexity:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="kn">import</span> <span class="nn">argparse</span>
<span class="n">parser</span> <span class="o">=</span> <span class="n">argparse</span><span class="o">.</span><span class="n">ArgumentParser</span><span class="p">()</span>
<span class="n">parser</span><span class="o">.</span><span class="n">add_argument</span><span class="p">(</span><span class="s">&quot;square&quot;</span><span class="p">,</span> <span class="nb">type</span><span class="o">=</span><span class="nb">int</span><span class="p">,</span>
                    <span class="n">help</span><span class="o">=</span><span class="s">&quot;display a square of a given number&quot;</span><span class="p">)</span>
<span class="n">parser</span><span class="o">.</span><span class="n">add_argument</span><span class="p">(</span><span class="s">&quot;-v&quot;</span><span class="p">,</span> <span class="s">&quot;--verbose&quot;</span><span class="p">,</span> <span class="n">action</span><span class="o">=</span><span class="s">&quot;store_true&quot;</span><span class="p">,</span>
                    <span class="n">help</span><span class="o">=</span><span class="s">&quot;increase output verbosity&quot;</span><span class="p">)</span>
<span class="n">args</span> <span class="o">=</span> <span class="n">parser</span><span class="o">.</span><span class="n">parse_args</span><span class="p">()</span>
<span class="n">answer</span> <span class="o">=</span> <span class="n">args</span><span class="o">.</span><span class="n">square</span><span class="o">**</span><span class="mi">2</span>
<span class="k">if</span> <span class="n">args</span><span class="o">.</span><span class="n">verbose</span><span class="p">:</span>
    <span class="k">print</span> <span class="s">&quot;the square of {} equals {}&quot;</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="n">args</span><span class="o">.</span><span class="n">square</span><span class="p">,</span> <span class="n">answer</span><span class="p">)</span>
<span class="k">else</span><span class="p">:</span>
    <span class="k">print</span> <span class="n">answer</span>
</pre></div>
</div>
<p>And now the output:</p>
<div class="highlight-sh"><div class="highlight"><pre><span class="nv">$ </span>python prog.py
usage: prog.py <span class="o">[</span>-h<span class="o">]</span> <span class="o">[</span>-v<span class="o">]</span> square
prog.py: error: the following arguments are required: square
<span class="nv">$ </span>python prog.py 4
16
<span class="nv">$ </span>python prog.py 4 --verbose
the square of 4 equals 16
<span class="nv">$ </span>python prog.py --verbose 4
the square of 4 equals 16
</pre></div>
</div>
<ul class="simple">
<li>We&#8217;ve brought back a positional argument, hence the complaint.</li>
<li>Note that the order does not matter.</li>
</ul>
<p>How about we give this program of ours back the ability to have
multiple verbosity values, and actually get to use them:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="kn">import</span> <span class="nn">argparse</span>
<span class="n">parser</span> <span class="o">=</span> <span class="n">argparse</span><span class="o">.</span><span class="n">ArgumentParser</span><span class="p">()</span>
<span class="n">parser</span><span class="o">.</span><span class="n">add_argument</span><span class="p">(</span><span class="s">&quot;square&quot;</span><span class="p">,</span> <span class="nb">type</span><span class="o">=</span><span class="nb">int</span><span class="p">,</span>
                    <span class="n">help</span><span class="o">=</span><span class="s">&quot;display a square of a given number&quot;</span><span class="p">)</span>
<span class="n">parser</span><span class="o">.</span><span class="n">add_argument</span><span class="p">(</span><span class="s">&quot;-v&quot;</span><span class="p">,</span> <span class="s">&quot;--verbosity&quot;</span><span class="p">,</span> <span class="nb">type</span><span class="o">=</span><span class="nb">int</span><span class="p">,</span>
                    <span class="n">help</span><span class="o">=</span><span class="s">&quot;increase output verbosity&quot;</span><span class="p">)</span>
<span class="n">args</span> <span class="o">=</span> <span class="n">parser</span><span class="o">.</span><span class="n">parse_args</span><span class="p">()</span>
<span class="n">answer</span> <span class="o">=</span> <span class="n">args</span><span class="o">.</span><span class="n">square</span><span class="o">**</span><span class="mi">2</span>
<span class="k">if</span> <span class="n">args</span><span class="o">.</span><span class="n">verbosity</span> <span class="o">==</span> <span class="mi">2</span><span class="p">:</span>
    <span class="k">print</span> <span class="s">&quot;the square of {} equals {}&quot;</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="n">args</span><span class="o">.</span><span class="n">square</span><span class="p">,</span> <span class="n">answer</span><span class="p">)</span>
<span class="k">elif</span> <span class="n">args</span><span class="o">.</span><span class="n">verbosity</span> <span class="o">==</span> <span class="mi">1</span><span class="p">:</span>
    <span class="k">print</span> <span class="s">&quot;{}^2 == {}&quot;</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="n">args</span><span class="o">.</span><span class="n">square</span><span class="p">,</span> <span class="n">answer</span><span class="p">)</span>
<span class="k">else</span><span class="p">:</span>
    <span class="k">print</span> <span class="n">answer</span>
</pre></div>
</div>
<p>And the output:</p>
<div class="highlight-sh"><div class="highlight"><pre><span class="nv">$ </span>python prog.py 4
16
<span class="nv">$ </span>python prog.py 4 -v
usage: prog.py <span class="o">[</span>-h<span class="o">]</span> <span class="o">[</span>-v VERBOSITY<span class="o">]</span> square
prog.py: error: argument -v/--verbosity: expected one argument
<span class="nv">$ </span>python prog.py 4 -v 1
4^2 <span class="o">==</span> 16
<span class="nv">$ </span>python prog.py 4 -v 2
the square of 4 equals 16
<span class="nv">$ </span>python prog.py 4 -v 3
16
</pre></div>
</div>
<p>These all look good except the last one, which exposes a bug in our program.
Let&#8217;s fix it by restricting the values the <tt class="docutils literal"><span class="pre">--verbosity</span></tt> option can accept:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="kn">import</span> <span class="nn">argparse</span>
<span class="n">parser</span> <span class="o">=</span> <span class="n">argparse</span><span class="o">.</span><span class="n">ArgumentParser</span><span class="p">()</span>
<span class="n">parser</span><span class="o">.</span><span class="n">add_argument</span><span class="p">(</span><span class="s">&quot;square&quot;</span><span class="p">,</span> <span class="nb">type</span><span class="o">=</span><span class="nb">int</span><span class="p">,</span>
                    <span class="n">help</span><span class="o">=</span><span class="s">&quot;display a square of a given number&quot;</span><span class="p">)</span>
<span class="n">parser</span><span class="o">.</span><span class="n">add_argument</span><span class="p">(</span><span class="s">&quot;-v&quot;</span><span class="p">,</span> <span class="s">&quot;--verbosity&quot;</span><span class="p">,</span> <span class="nb">type</span><span class="o">=</span><span class="nb">int</span><span class="p">,</span> <span class="n">choices</span><span class="o">=</span><span class="p">[</span><span class="mi">0</span><span class="p">,</span> <span class="mi">1</span><span class="p">,</span> <span class="mi">2</span><span class="p">],</span>
                    <span class="n">help</span><span class="o">=</span><span class="s">&quot;increase output verbosity&quot;</span><span class="p">)</span>
<span class="n">args</span> <span class="o">=</span> <span class="n">parser</span><span class="o">.</span><span class="n">parse_args</span><span class="p">()</span>
<span class="n">answer</span> <span class="o">=</span> <span class="n">args</span><span class="o">.</span><span class="n">square</span><span class="o">**</span><span class="mi">2</span>
<span class="k">if</span> <span class="n">args</span><span class="o">.</span><span class="n">verbosity</span> <span class="o">==</span> <span class="mi">2</span><span class="p">:</span>
    <span class="k">print</span> <span class="s">&quot;the square of {} equals {}&quot;</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="n">args</span><span class="o">.</span><span class="n">square</span><span class="p">,</span> <span class="n">answer</span><span class="p">)</span>
<span class="k">elif</span> <span class="n">args</span><span class="o">.</span><span class="n">verbosity</span> <span class="o">==</span> <span class="mi">1</span><span class="p">:</span>
    <span class="k">print</span> <span class="s">&quot;{}^2 == {}&quot;</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="n">args</span><span class="o">.</span><span class="n">square</span><span class="p">,</span> <span class="n">answer</span><span class="p">)</span>
<span class="k">else</span><span class="p">:</span>
    <span class="k">print</span> <span class="n">answer</span>
</pre></div>
</div>
<p>And the output:</p>
<div class="highlight-sh"><div class="highlight"><pre><span class="nv">$ </span>python prog.py 4 -v 3
usage: prog.py <span class="o">[</span>-h<span class="o">]</span> <span class="o">[</span>-v <span class="o">{</span>0,1,2<span class="o">}]</span> square
prog.py: error: argument -v/--verbosity: invalid choice: 3 <span class="o">(</span>choose from 0, 1, 2<span class="o">)</span>
<span class="nv">$ </span>python prog.py 4 -h
usage: prog.py <span class="o">[</span>-h<span class="o">]</span> <span class="o">[</span>-v <span class="o">{</span>0,1,2<span class="o">}]</span> square

positional arguments:
  square                display a square of a given number

optional arguments:
  -h, --help            show this <span class="nb">help </span>message and <span class="nb">exit</span>
  -v <span class="o">{</span>0,1,2<span class="o">}</span>, --verbosity <span class="o">{</span>0,1,2<span class="o">}</span>
                        increase output verbosity
</pre></div>
</div>
<p>Note that the change also reflects both in the error message as well as the
help string.</p>
<p>Now, let&#8217;s use a different approach of playing with verbosity, which is pretty
common. It also matches the way the CPython executable handles its own
verbosity argument (check the output of <tt class="docutils literal"><span class="pre">python</span> <span class="pre">--help</span></tt>):</p>
<div class="highlight-python"><div class="highlight"><pre><span class="kn">import</span> <span class="nn">argparse</span>
<span class="n">parser</span> <span class="o">=</span> <span class="n">argparse</span><span class="o">.</span><span class="n">ArgumentParser</span><span class="p">()</span>
<span class="n">parser</span><span class="o">.</span><span class="n">add_argument</span><span class="p">(</span><span class="s">&quot;square&quot;</span><span class="p">,</span> <span class="nb">type</span><span class="o">=</span><span class="nb">int</span><span class="p">,</span>
                    <span class="n">help</span><span class="o">=</span><span class="s">&quot;display the square of a given number&quot;</span><span class="p">)</span>
<span class="n">parser</span><span class="o">.</span><span class="n">add_argument</span><span class="p">(</span><span class="s">&quot;-v&quot;</span><span class="p">,</span> <span class="s">&quot;--verbosity&quot;</span><span class="p">,</span> <span class="n">action</span><span class="o">=</span><span class="s">&quot;count&quot;</span><span class="p">,</span>
                    <span class="n">help</span><span class="o">=</span><span class="s">&quot;increase output verbosity&quot;</span><span class="p">)</span>
<span class="n">args</span> <span class="o">=</span> <span class="n">parser</span><span class="o">.</span><span class="n">parse_args</span><span class="p">()</span>
<span class="n">answer</span> <span class="o">=</span> <span class="n">args</span><span class="o">.</span><span class="n">square</span><span class="o">**</span><span class="mi">2</span>
<span class="k">if</span> <span class="n">args</span><span class="o">.</span><span class="n">verbosity</span> <span class="o">==</span> <span class="mi">2</span><span class="p">:</span>
    <span class="k">print</span> <span class="s">&quot;the square of {} equals {}&quot;</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="n">args</span><span class="o">.</span><span class="n">square</span><span class="p">,</span> <span class="n">answer</span><span class="p">)</span>
<span class="k">elif</span> <span class="n">args</span><span class="o">.</span><span class="n">verbosity</span> <span class="o">==</span> <span class="mi">1</span><span class="p">:</span>
    <span class="k">print</span> <span class="s">&quot;{}^2 == {}&quot;</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="n">args</span><span class="o">.</span><span class="n">square</span><span class="p">,</span> <span class="n">answer</span><span class="p">)</span>
<span class="k">else</span><span class="p">:</span>
    <span class="k">print</span> <span class="n">answer</span>
</pre></div>
</div>
<p>We have introduced another action, &#8220;count&#8221;,
to count the number of occurences of a specific optional arguments:</p>
<div class="highlight-sh"><div class="highlight"><pre><span class="nv">$ </span>python prog.py 4
16
<span class="nv">$ </span>python prog.py 4 -v
4^2 <span class="o">==</span> 16
<span class="nv">$ </span>python prog.py 4 -vv
the square of 4 equals 16
<span class="nv">$ </span>python prog.py 4 --verbosity --verbosity
the square of 4 equals 16
<span class="nv">$ </span>python prog.py 4 -v 1
usage: prog.py <span class="o">[</span>-h<span class="o">]</span> <span class="o">[</span>-v<span class="o">]</span> square
prog.py: error: unrecognized arguments: 1
<span class="nv">$ </span>python prog.py 4 -h
usage: prog.py <span class="o">[</span>-h<span class="o">]</span> <span class="o">[</span>-v<span class="o">]</span> square

positional arguments:
  square           display a square of a given number

optional arguments:
  -h, --help       show this <span class="nb">help </span>message and <span class="nb">exit</span>
  -v, --verbosity  increase output verbosity
<span class="nv">$ </span>python prog.py 4 -vvv
16
</pre></div>
</div>
<ul class="simple">
<li>Yes, it&#8217;s now more of a flag (similar to <tt class="docutils literal"><span class="pre">action=&quot;store_true&quot;</span></tt>) in the
previous version of our script. That should explain the complaint.</li>
<li>It also behaves similar to &#8220;store_true&#8221; action.</li>
<li>Now here&#8217;s a demonstration of what the &#8220;count&#8221; action gives. You&#8217;ve probably
seen this sort of usage before.</li>
<li>And, just like the &#8220;store_true&#8221; action, if you don&#8217;t specify the <tt class="docutils literal"><span class="pre">-v</span></tt> flag,
that flag is considered to have <tt class="docutils literal"><span class="pre">None</span></tt> value.</li>
<li>As should be expected, specifying the long form of the flag, we should get
the same output.</li>
<li>Sadly, our help output isn&#8217;t very informative on the new ability our script
has acquired, but that can always be fixed by improving the documentation for
out script (e.g. via the <tt class="docutils literal"><span class="pre">help</span></tt> keyword argument).</li>
<li>That last output exposes a bug in our program.</li>
</ul>
<p>Let&#8217;s fix:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="kn">import</span> <span class="nn">argparse</span>
<span class="n">parser</span> <span class="o">=</span> <span class="n">argparse</span><span class="o">.</span><span class="n">ArgumentParser</span><span class="p">()</span>
<span class="n">parser</span><span class="o">.</span><span class="n">add_argument</span><span class="p">(</span><span class="s">&quot;square&quot;</span><span class="p">,</span> <span class="nb">type</span><span class="o">=</span><span class="nb">int</span><span class="p">,</span>
                    <span class="n">help</span><span class="o">=</span><span class="s">&quot;display a square of a given number&quot;</span><span class="p">)</span>
<span class="n">parser</span><span class="o">.</span><span class="n">add_argument</span><span class="p">(</span><span class="s">&quot;-v&quot;</span><span class="p">,</span> <span class="s">&quot;--verbosity&quot;</span><span class="p">,</span> <span class="n">action</span><span class="o">=</span><span class="s">&quot;count&quot;</span><span class="p">,</span>
                    <span class="n">help</span><span class="o">=</span><span class="s">&quot;increase output verbosity&quot;</span><span class="p">)</span>
<span class="n">args</span> <span class="o">=</span> <span class="n">parser</span><span class="o">.</span><span class="n">parse_args</span><span class="p">()</span>
<span class="n">answer</span> <span class="o">=</span> <span class="n">args</span><span class="o">.</span><span class="n">square</span><span class="o">**</span><span class="mi">2</span>

<span class="c"># bugfix: replace == with &gt;=</span>
<span class="k">if</span> <span class="n">args</span><span class="o">.</span><span class="n">verbosity</span> <span class="o">&gt;=</span> <span class="mi">2</span><span class="p">:</span>
    <span class="k">print</span> <span class="s">&quot;the square of {} equals {}&quot;</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="n">args</span><span class="o">.</span><span class="n">square</span><span class="p">,</span> <span class="n">answer</span><span class="p">)</span>
<span class="k">elif</span> <span class="n">args</span><span class="o">.</span><span class="n">verbosity</span> <span class="o">&gt;=</span> <span class="mi">1</span><span class="p">:</span>
    <span class="k">print</span> <span class="s">&quot;{}^2 == {}&quot;</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="n">args</span><span class="o">.</span><span class="n">square</span><span class="p">,</span> <span class="n">answer</span><span class="p">)</span>
<span class="k">else</span><span class="p">:</span>
    <span class="k">print</span> <span class="n">answer</span>
</pre></div>
</div>
<p>And this is what it gives:</p>
<div class="highlight-sh"><div class="highlight"><pre><span class="nv">$ </span>python prog.py 4 -vvv
the square of 4 equals 16
<span class="nv">$ </span>python prog.py 4 -vvvv
the square of 4 equals 16
<span class="nv">$ </span>python prog.py 4
Traceback <span class="o">(</span>most recent call last<span class="o">)</span>:
  File <span class="s2">&quot;prog.py&quot;</span>, line 11, in &lt;module&gt;
    <span class="k">if </span>args.verbosity &gt;<span class="o">=</span> 2:
TypeError: unorderable types: NoneType<span class="o">()</span> &gt;<span class="o">=</span> int<span class="o">()</span>
</pre></div>
</div>
<ul class="simple">
<li>First output went well, and fixes the bug we had before.
That is, we want any value &gt;= 2 to be as verbose as possible.</li>
<li>Third output not so good.</li>
</ul>
<p>Let&#8217;s fix that bug:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="kn">import</span> <span class="nn">argparse</span>
<span class="n">parser</span> <span class="o">=</span> <span class="n">argparse</span><span class="o">.</span><span class="n">ArgumentParser</span><span class="p">()</span>
<span class="n">parser</span><span class="o">.</span><span class="n">add_argument</span><span class="p">(</span><span class="s">&quot;square&quot;</span><span class="p">,</span> <span class="nb">type</span><span class="o">=</span><span class="nb">int</span><span class="p">,</span>
                    <span class="n">help</span><span class="o">=</span><span class="s">&quot;display a square of a given number&quot;</span><span class="p">)</span>
<span class="n">parser</span><span class="o">.</span><span class="n">add_argument</span><span class="p">(</span><span class="s">&quot;-v&quot;</span><span class="p">,</span> <span class="s">&quot;--verbosity&quot;</span><span class="p">,</span> <span class="n">action</span><span class="o">=</span><span class="s">&quot;count&quot;</span><span class="p">,</span> <span class="n">default</span><span class="o">=</span><span class="mi">0</span><span class="p">,</span>
                    <span class="n">help</span><span class="o">=</span><span class="s">&quot;increase output verbosity&quot;</span><span class="p">)</span>
<span class="n">args</span> <span class="o">=</span> <span class="n">parser</span><span class="o">.</span><span class="n">parse_args</span><span class="p">()</span>
<span class="n">answer</span> <span class="o">=</span> <span class="n">args</span><span class="o">.</span><span class="n">square</span><span class="o">**</span><span class="mi">2</span>
<span class="k">if</span> <span class="n">args</span><span class="o">.</span><span class="n">verbosity</span> <span class="o">&gt;=</span> <span class="mi">2</span><span class="p">:</span>
    <span class="k">print</span> <span class="s">&quot;the square of {} equals {}&quot;</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="n">args</span><span class="o">.</span><span class="n">square</span><span class="p">,</span> <span class="n">answer</span><span class="p">)</span>
<span class="k">elif</span> <span class="n">args</span><span class="o">.</span><span class="n">verbosity</span> <span class="o">&gt;=</span> <span class="mi">1</span><span class="p">:</span>
    <span class="k">print</span> <span class="s">&quot;{}^2 == {}&quot;</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="n">args</span><span class="o">.</span><span class="n">square</span><span class="p">,</span> <span class="n">answer</span><span class="p">)</span>
<span class="k">else</span><span class="p">:</span>
    <span class="k">print</span> <span class="n">answer</span>
</pre></div>
</div>
<p>We&#8217;ve just introduced yet another keyword, <tt class="docutils literal"><span class="pre">default</span></tt>.
We&#8217;ve set it to <tt class="docutils literal"><span class="pre">0</span></tt> in order to make it comparable to the other int values.
Remember that by default,
if an optional argument isn&#8217;t specified,
it gets the <tt class="docutils literal"><span class="pre">None</span></tt> value, and that cannot be compared to an int value
(hence the <a class="reference internal" href="../library/exceptions.html#exceptions.TypeError" title="exceptions.TypeError"><tt class="xref py py-exc docutils literal"><span class="pre">TypeError</span></tt></a> exception).</p>
<p>And:</p>
<div class="highlight-sh"><div class="highlight"><pre><span class="nv">$ </span>python prog.py 4
16
</pre></div>
</div>
<p>You can go quite far just with what we&#8217;ve learned so far,
and we have only scratched the surface.
The <a class="reference internal" href="../library/argparse.html#module-argparse" title="argparse: Command-line option and argument parsing library."><tt class="xref py py-mod docutils literal"><span class="pre">argparse</span></tt></a> module is very powerful,
and we&#8217;ll explore a bit more of it before we end this tutorial.</p>
</div>
<div class="section" id="getting-a-little-more-advanced">
<h2>Getting a little more advanced<a class="headerlink" href="#getting-a-little-more-advanced" title="Permalink to this headline">¶</a></h2>
<p>What if we wanted to expand our tiny program to perform other powers,
not just squares:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="kn">import</span> <span class="nn">argparse</span>
<span class="n">parser</span> <span class="o">=</span> <span class="n">argparse</span><span class="o">.</span><span class="n">ArgumentParser</span><span class="p">()</span>
<span class="n">parser</span><span class="o">.</span><span class="n">add_argument</span><span class="p">(</span><span class="s">&quot;x&quot;</span><span class="p">,</span> <span class="nb">type</span><span class="o">=</span><span class="nb">int</span><span class="p">,</span> <span class="n">help</span><span class="o">=</span><span class="s">&quot;the base&quot;</span><span class="p">)</span>
<span class="n">parser</span><span class="o">.</span><span class="n">add_argument</span><span class="p">(</span><span class="s">&quot;y&quot;</span><span class="p">,</span> <span class="nb">type</span><span class="o">=</span><span class="nb">int</span><span class="p">,</span> <span class="n">help</span><span class="o">=</span><span class="s">&quot;the exponent&quot;</span><span class="p">)</span>
<span class="n">parser</span><span class="o">.</span><span class="n">add_argument</span><span class="p">(</span><span class="s">&quot;-v&quot;</span><span class="p">,</span> <span class="s">&quot;--verbosity&quot;</span><span class="p">,</span> <span class="n">action</span><span class="o">=</span><span class="s">&quot;count&quot;</span><span class="p">,</span> <span class="n">default</span><span class="o">=</span><span class="mi">0</span><span class="p">)</span>
<span class="n">args</span> <span class="o">=</span> <span class="n">parser</span><span class="o">.</span><span class="n">parse_args</span><span class="p">()</span>
<span class="n">answer</span> <span class="o">=</span> <span class="n">args</span><span class="o">.</span><span class="n">x</span><span class="o">**</span><span class="n">args</span><span class="o">.</span><span class="n">y</span>
<span class="k">if</span> <span class="n">args</span><span class="o">.</span><span class="n">verbosity</span> <span class="o">&gt;=</span> <span class="mi">2</span><span class="p">:</span>
    <span class="k">print</span> <span class="s">&quot;{} to the power {} equals {}&quot;</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="n">args</span><span class="o">.</span><span class="n">x</span><span class="p">,</span> <span class="n">args</span><span class="o">.</span><span class="n">y</span><span class="p">,</span> <span class="n">answer</span><span class="p">)</span>
<span class="k">elif</span> <span class="n">args</span><span class="o">.</span><span class="n">verbosity</span> <span class="o">&gt;=</span> <span class="mi">1</span><span class="p">:</span>
    <span class="k">print</span> <span class="s">&quot;{}^{} == {}&quot;</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="n">args</span><span class="o">.</span><span class="n">x</span><span class="p">,</span> <span class="n">args</span><span class="o">.</span><span class="n">y</span><span class="p">,</span> <span class="n">answer</span><span class="p">)</span>
<span class="k">else</span><span class="p">:</span>
    <span class="k">print</span> <span class="n">answer</span>
</pre></div>
</div>
<p>Output:</p>
<div class="highlight-sh"><div class="highlight"><pre><span class="nv">$ </span>python prog.py
usage: prog.py <span class="o">[</span>-h<span class="o">]</span> <span class="o">[</span>-v<span class="o">]</span> x y
prog.py: error: the following arguments are required: x, y
<span class="nv">$ </span>python prog.py -h
usage: prog.py <span class="o">[</span>-h<span class="o">]</span> <span class="o">[</span>-v<span class="o">]</span> x y

positional arguments:
  x                the base
  y                the exponent

optional arguments:
  -h, --help       show this <span class="nb">help </span>message and <span class="nb">exit</span>
  -v, --verbosity
<span class="nv">$ </span>python prog.py 4 2 -v
4^2 <span class="o">==</span> 16
</pre></div>
</div>
<p>Notice that so far we&#8217;ve been using verbosity level to <em>change</em> the text
that gets displayed. The following example instead uses verbosity level
to display <em>more</em> text instead:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="kn">import</span> <span class="nn">argparse</span>
<span class="n">parser</span> <span class="o">=</span> <span class="n">argparse</span><span class="o">.</span><span class="n">ArgumentParser</span><span class="p">()</span>
<span class="n">parser</span><span class="o">.</span><span class="n">add_argument</span><span class="p">(</span><span class="s">&quot;x&quot;</span><span class="p">,</span> <span class="nb">type</span><span class="o">=</span><span class="nb">int</span><span class="p">,</span> <span class="n">help</span><span class="o">=</span><span class="s">&quot;the base&quot;</span><span class="p">)</span>
<span class="n">parser</span><span class="o">.</span><span class="n">add_argument</span><span class="p">(</span><span class="s">&quot;y&quot;</span><span class="p">,</span> <span class="nb">type</span><span class="o">=</span><span class="nb">int</span><span class="p">,</span> <span class="n">help</span><span class="o">=</span><span class="s">&quot;the exponent&quot;</span><span class="p">)</span>
<span class="n">parser</span><span class="o">.</span><span class="n">add_argument</span><span class="p">(</span><span class="s">&quot;-v&quot;</span><span class="p">,</span> <span class="s">&quot;--verbosity&quot;</span><span class="p">,</span> <span class="n">action</span><span class="o">=</span><span class="s">&quot;count&quot;</span><span class="p">,</span> <span class="n">default</span><span class="o">=</span><span class="mi">0</span><span class="p">)</span>
<span class="n">args</span> <span class="o">=</span> <span class="n">parser</span><span class="o">.</span><span class="n">parse_args</span><span class="p">()</span>
<span class="n">answer</span> <span class="o">=</span> <span class="n">args</span><span class="o">.</span><span class="n">x</span><span class="o">**</span><span class="n">args</span><span class="o">.</span><span class="n">y</span>
<span class="k">if</span> <span class="n">args</span><span class="o">.</span><span class="n">verbosity</span> <span class="o">&gt;=</span> <span class="mi">2</span><span class="p">:</span>
    <span class="k">print</span> <span class="s">&quot;Running &#39;{}&#39;&quot;</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="n">__file__</span><span class="p">)</span>
<span class="k">if</span> <span class="n">args</span><span class="o">.</span><span class="n">verbosity</span> <span class="o">&gt;=</span> <span class="mi">1</span><span class="p">:</span>
    <span class="k">print</span> <span class="s">&quot;{}^{} ==&quot;</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="n">args</span><span class="o">.</span><span class="n">x</span><span class="p">,</span> <span class="n">args</span><span class="o">.</span><span class="n">y</span><span class="p">),</span>
<span class="k">print</span> <span class="n">answer</span>
</pre></div>
</div>
<p>Output:</p>
<div class="highlight-sh"><div class="highlight"><pre><span class="nv">$ </span>python prog.py 4 2
16
<span class="nv">$ </span>python prog.py 4 2 -v
4^2 <span class="o">==</span> 16
<span class="nv">$ </span>python prog.py 4 2 -vv
Running <span class="s1">&#39;prog.py&#39;</span>
4^2 <span class="o">==</span> 16
</pre></div>
</div>
<div class="section" id="conflicting-options">
<h3>Conflicting options<a class="headerlink" href="#conflicting-options" title="Permalink to this headline">¶</a></h3>
<p>So far, we have been working with two methods of an
<a class="reference internal" href="../library/argparse.html#argparse.ArgumentParser" title="argparse.ArgumentParser"><tt class="xref py py-class docutils literal"><span class="pre">argparse.ArgumentParser</span></tt></a> instance. Let&#8217;s introduce a third one,
<tt class="xref py py-meth docutils literal"><span class="pre">add_mutually_exclusive_group()</span></tt>. It allows for us to specify options that
conflict with each other. Let&#8217;s also change the rest of the program so that
the new functionality makes more sense:
we&#8217;ll introduce the <tt class="docutils literal"><span class="pre">--quiet</span></tt> option,
which will be the opposite of the <tt class="docutils literal"><span class="pre">--verbose</span></tt> one:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="kn">import</span> <span class="nn">argparse</span>

<span class="n">parser</span> <span class="o">=</span> <span class="n">argparse</span><span class="o">.</span><span class="n">ArgumentParser</span><span class="p">()</span>
<span class="n">group</span> <span class="o">=</span> <span class="n">parser</span><span class="o">.</span><span class="n">add_mutually_exclusive_group</span><span class="p">()</span>
<span class="n">group</span><span class="o">.</span><span class="n">add_argument</span><span class="p">(</span><span class="s">&quot;-v&quot;</span><span class="p">,</span> <span class="s">&quot;--verbose&quot;</span><span class="p">,</span> <span class="n">action</span><span class="o">=</span><span class="s">&quot;store_true&quot;</span><span class="p">)</span>
<span class="n">group</span><span class="o">.</span><span class="n">add_argument</span><span class="p">(</span><span class="s">&quot;-q&quot;</span><span class="p">,</span> <span class="s">&quot;--quiet&quot;</span><span class="p">,</span> <span class="n">action</span><span class="o">=</span><span class="s">&quot;store_true&quot;</span><span class="p">)</span>
<span class="n">parser</span><span class="o">.</span><span class="n">add_argument</span><span class="p">(</span><span class="s">&quot;x&quot;</span><span class="p">,</span> <span class="nb">type</span><span class="o">=</span><span class="nb">int</span><span class="p">,</span> <span class="n">help</span><span class="o">=</span><span class="s">&quot;the base&quot;</span><span class="p">)</span>
<span class="n">parser</span><span class="o">.</span><span class="n">add_argument</span><span class="p">(</span><span class="s">&quot;y&quot;</span><span class="p">,</span> <span class="nb">type</span><span class="o">=</span><span class="nb">int</span><span class="p">,</span> <span class="n">help</span><span class="o">=</span><span class="s">&quot;the exponent&quot;</span><span class="p">)</span>
<span class="n">args</span> <span class="o">=</span> <span class="n">parser</span><span class="o">.</span><span class="n">parse_args</span><span class="p">()</span>
<span class="n">answer</span> <span class="o">=</span> <span class="n">args</span><span class="o">.</span><span class="n">x</span><span class="o">**</span><span class="n">args</span><span class="o">.</span><span class="n">y</span>

<span class="k">if</span> <span class="n">args</span><span class="o">.</span><span class="n">quiet</span><span class="p">:</span>
    <span class="k">print</span> <span class="n">answer</span>
<span class="k">elif</span> <span class="n">args</span><span class="o">.</span><span class="n">verbose</span><span class="p">:</span>
    <span class="k">print</span> <span class="s">&quot;{} to the power {} equals {}&quot;</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="n">args</span><span class="o">.</span><span class="n">x</span><span class="p">,</span> <span class="n">args</span><span class="o">.</span><span class="n">y</span><span class="p">,</span> <span class="n">answer</span><span class="p">)</span>
<span class="k">else</span><span class="p">:</span>
    <span class="k">print</span> <span class="s">&quot;{}^{} == {}&quot;</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="n">args</span><span class="o">.</span><span class="n">x</span><span class="p">,</span> <span class="n">args</span><span class="o">.</span><span class="n">y</span><span class="p">,</span> <span class="n">answer</span><span class="p">)</span>
</pre></div>
</div>
<p>Our program is now simpler, and we&#8217;ve lost some functionality for the sake of
demonstration. Anyways, here&#8217;s the output:</p>
<div class="highlight-sh"><div class="highlight"><pre><span class="nv">$ </span>python prog.py 4 2
4^2 <span class="o">==</span> 16
<span class="nv">$ </span>python prog.py 4 2 -q
16
<span class="nv">$ </span>python prog.py 4 2 -v
4 to the power 2 equals 16
<span class="nv">$ </span>python prog.py 4 2 -vq
usage: prog.py <span class="o">[</span>-h<span class="o">]</span> <span class="o">[</span>-v | -q<span class="o">]</span> x y
prog.py: error: argument -q/--quiet: not allowed with argument -v/--verbose
<span class="nv">$ </span>python prog.py 4 2 -v --quiet
usage: prog.py <span class="o">[</span>-h<span class="o">]</span> <span class="o">[</span>-v | -q<span class="o">]</span> x y
prog.py: error: argument -q/--quiet: not allowed with argument -v/--verbose
</pre></div>
</div>
<p>That should be easy to follow. I&#8217;ve added that last output so you can see the
sort of flexibility you get, i.e. mixing long form options with short form
ones.</p>
<p>Before we conclude, you probably want to tell your users the main purpose of
your program, just in case they don&#8217;t know:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="kn">import</span> <span class="nn">argparse</span>

<span class="n">parser</span> <span class="o">=</span> <span class="n">argparse</span><span class="o">.</span><span class="n">ArgumentParser</span><span class="p">(</span><span class="n">description</span><span class="o">=</span><span class="s">&quot;calculate X to the power of Y&quot;</span><span class="p">)</span>
<span class="n">group</span> <span class="o">=</span> <span class="n">parser</span><span class="o">.</span><span class="n">add_mutually_exclusive_group</span><span class="p">()</span>
<span class="n">group</span><span class="o">.</span><span class="n">add_argument</span><span class="p">(</span><span class="s">&quot;-v&quot;</span><span class="p">,</span> <span class="s">&quot;--verbose&quot;</span><span class="p">,</span> <span class="n">action</span><span class="o">=</span><span class="s">&quot;store_true&quot;</span><span class="p">)</span>
<span class="n">group</span><span class="o">.</span><span class="n">add_argument</span><span class="p">(</span><span class="s">&quot;-q&quot;</span><span class="p">,</span> <span class="s">&quot;--quiet&quot;</span><span class="p">,</span> <span class="n">action</span><span class="o">=</span><span class="s">&quot;store_true&quot;</span><span class="p">)</span>
<span class="n">parser</span><span class="o">.</span><span class="n">add_argument</span><span class="p">(</span><span class="s">&quot;x&quot;</span><span class="p">,</span> <span class="nb">type</span><span class="o">=</span><span class="nb">int</span><span class="p">,</span> <span class="n">help</span><span class="o">=</span><span class="s">&quot;the base&quot;</span><span class="p">)</span>
<span class="n">parser</span><span class="o">.</span><span class="n">add_argument</span><span class="p">(</span><span class="s">&quot;y&quot;</span><span class="p">,</span> <span class="nb">type</span><span class="o">=</span><span class="nb">int</span><span class="p">,</span> <span class="n">help</span><span class="o">=</span><span class="s">&quot;the exponent&quot;</span><span class="p">)</span>
<span class="n">args</span> <span class="o">=</span> <span class="n">parser</span><span class="o">.</span><span class="n">parse_args</span><span class="p">()</span>
<span class="n">answer</span> <span class="o">=</span> <span class="n">args</span><span class="o">.</span><span class="n">x</span><span class="o">**</span><span class="n">args</span><span class="o">.</span><span class="n">y</span>

<span class="k">if</span> <span class="n">args</span><span class="o">.</span><span class="n">quiet</span><span class="p">:</span>
    <span class="k">print</span> <span class="n">answer</span>
<span class="k">elif</span> <span class="n">args</span><span class="o">.</span><span class="n">verbose</span><span class="p">:</span>
    <span class="k">print</span> <span class="s">&quot;{} to the power {} equals {}&quot;</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="n">args</span><span class="o">.</span><span class="n">x</span><span class="p">,</span> <span class="n">args</span><span class="o">.</span><span class="n">y</span><span class="p">,</span> <span class="n">answer</span><span class="p">)</span>
<span class="k">else</span><span class="p">:</span>
    <span class="k">print</span> <span class="s">&quot;{}^{} == {}&quot;</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="n">args</span><span class="o">.</span><span class="n">x</span><span class="p">,</span> <span class="n">args</span><span class="o">.</span><span class="n">y</span><span class="p">,</span> <span class="n">answer</span><span class="p">)</span>
</pre></div>
</div>
<p>Note that slight difference in the usage text. Note the <tt class="docutils literal"><span class="pre">[-v</span> <span class="pre">|</span> <span class="pre">-q]</span></tt>,
which tells us that we can either use <tt class="docutils literal"><span class="pre">-v</span></tt> or <tt class="docutils literal"><span class="pre">-q</span></tt>,
but not both at the same time:</p>
<div class="highlight-sh"><div class="highlight"><pre><span class="nv">$ </span>python prog.py --help
usage: prog.py <span class="o">[</span>-h<span class="o">]</span> <span class="o">[</span>-v | -q<span class="o">]</span> x y

calculate X to the power of Y

positional arguments:
  x              the base
  y              the exponent

optional arguments:
  -h, --help     show this <span class="nb">help </span>message and <span class="nb">exit</span>
  -v, --verbose
  -q, --quiet
</pre></div>
</div>
</div>
</div>
<div class="section" id="conclusion">
<h2>Conclusion<a class="headerlink" href="#conclusion" title="Permalink to this headline">¶</a></h2>
<p>The <a class="reference internal" href="../library/argparse.html#module-argparse" title="argparse: Command-line option and argument parsing library."><tt class="xref py py-mod docutils literal"><span class="pre">argparse</span></tt></a> module offers a lot more than shown here.
Its docs are quite detailed and thorough, and full of examples.
Having gone through this tutorial, you should easily digest them
without feeling overwhelmed.</p>
</div>
</div>


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  <h3><a href="../contents.html">Table Of Contents</a></h3>
  <ul>
<li><a class="reference internal" href="#">Argparse Tutorial</a><ul>
<li><a class="reference internal" href="#concepts">Concepts</a></li>
<li><a class="reference internal" href="#the-basics">The basics</a></li>
<li><a class="reference internal" href="#introducing-positional-arguments">Introducing Positional arguments</a></li>
<li><a class="reference internal" href="#introducing-optional-arguments">Introducing Optional arguments</a><ul>
<li><a class="reference internal" href="#short-options">Short options</a></li>
</ul>
</li>
<li><a class="reference internal" href="#combining-positional-and-optional-arguments">Combining Positional and Optional arguments</a></li>
<li><a class="reference internal" href="#getting-a-little-more-advanced">Getting a little more advanced</a><ul>
<li><a class="reference internal" href="#conflicting-options">Conflicting options</a></li>
</ul>
</li>
<li><a class="reference internal" href="#conclusion">Conclusion</a></li>
</ul>
</li>
</ul>

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