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<div class="section" id="other-utilities">
<h1>Other utilities<a class="headerlink" href="#other-utilities" title="Permalink to this headline">¶</a></h1>
<div class="section" id="filetype-objects">
<h2>FileType objects<a class="headerlink" href="#filetype-objects" title="Permalink to this headline">¶</a></h2>
<dl class="class">
<dt id="FileType">
<em class="property">
class </em><tt class="descname">FileType</tt><big>(</big><em>mode='r'</em>, <em>bufsize=None</em><big>)</big><a class="headerlink" href="#FileType" title="Permalink to this definition">¶</a></dt>
<dd><p>The <a title="FileType" class="reference internal" href="#FileType"><tt class="xref docutils literal"><span class="pre">FileType</span></tt></a> factory creates objects that can be passed to the type argument of <a title="add_argument" class="reference external" href="add_argument.html#add_argument"><tt class="xref docutils literal"><span class="pre">add_argument()</span></tt></a>. Arguments that have <a title="FileType" class="reference internal" href="#FileType"><tt class="xref docutils literal"><span class="pre">FileType</span></tt></a> objects as their type will open command-line args as files with the requested modes and buffer sizes:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">>>> </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="gp">>>> </span><span class="n">parser</span><span class="o">.</span><span class="n">add_argument</span><span class="p">(</span><span class="s">'--output'</span><span class="p">,</span> <span class="nb">type</span><span class="o">=</span><span class="n">argparse</span><span class="o">.</span><span class="n">FileType</span><span class="p">(</span><span class="s">'wb'</span><span class="p">,</span> <span class="mf">0</span><span class="p">))</span>
<span class="gp">>>> </span><span class="n">parser</span><span class="o">.</span><span class="n">parse_args</span><span class="p">([</span><span class="s">'--output'</span><span class="p">,</span> <span class="s">'out'</span><span class="p">])</span>
<span class="go">Namespace(output=<open file 'out', mode 'wb' at 0x...>)</span>
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<p>FileType objects understand the pseudo-argument <tt class="docutils literal"><span class="pre">'-'</span></tt> and automatically convert this into <tt class="docutils literal"><span class="pre">sys.stdin</span></tt> for readable <a title="FileType" class="reference internal" href="#FileType"><tt class="xref docutils literal"><span class="pre">FileType</span></tt></a> objects and <tt class="docutils literal"><span class="pre">sys.stdout</span></tt> for writable <a title="FileType" class="reference internal" href="#FileType"><tt class="xref docutils literal"><span class="pre">FileType</span></tt></a> objects:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">>>> </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="gp">>>> </span><span class="n">parser</span><span class="o">.</span><span class="n">add_argument</span><span class="p">(</span><span class="s">'infile'</span><span class="p">,</span> <span class="nb">type</span><span class="o">=</span><span class="n">argparse</span><span class="o">.</span><span class="n">FileType</span><span class="p">(</span><span class="s">'r'</span><span class="p">))</span>
<span class="gp">>>> </span><span class="n">parser</span><span class="o">.</span><span class="n">parse_args</span><span class="p">([</span><span class="s">'-'</span><span class="p">])</span>
<span class="go">Namespace(infile=<open file '<stdin>', mode 'r' at 0x...>)</span>
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