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<h1>7. py.io<a class="headerlink" href="#py-io" title="Permalink to this headline"></a></h1>
<p>The &#8216;py&#8217; lib provides helper classes for capturing IO during
execution of a program.</p>
<div class="section" id="io-capturing-examples">
<h2>7.1. IO Capturing examples<a class="headerlink" href="#io-capturing-examples" title="Permalink to this headline"></a></h2>
<div class="section" id="py-io-stdcapture">
<h3>7.1.1. <tt class="docutils literal"><span class="pre">py.io.StdCapture</span></tt><a class="headerlink" href="#py-io-stdcapture" title="Permalink to this headline"></a></h3>
<p>Basic Example:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="kn">import</span> <span class="nn">py</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">capture</span> <span class="o">=</span> <span class="n">py</span><span class="o">.</span><span class="n">io</span><span class="o">.</span><span class="n">StdCapture</span><span class="p">()</span>
<span class="gp">&gt;&gt;&gt; </span><span class="k">print</span> <span class="s">&quot;hello&quot;</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">out</span><span class="p">,</span><span class="n">err</span> <span class="o">=</span> <span class="n">capture</span><span class="o">.</span><span class="n">reset</span><span class="p">()</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">out</span><span class="o">.</span><span class="n">strip</span><span class="p">()</span> <span class="o">==</span> <span class="s">&quot;hello&quot;</span>
<span class="go">True</span>
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<p>For calling functions you may use a shortcut:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="kn">import</span> <span class="nn">py</span>
<span class="gp">&gt;&gt;&gt; </span><span class="k">def</span> <span class="nf">f</span><span class="p">():</span> <span class="k">print</span> <span class="s">&quot;hello&quot;</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">res</span><span class="p">,</span> <span class="n">out</span><span class="p">,</span> <span class="n">err</span> <span class="o">=</span> <span class="n">py</span><span class="o">.</span><span class="n">io</span><span class="o">.</span><span class="n">StdCapture</span><span class="o">.</span><span class="n">call</span><span class="p">(</span><span class="n">f</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">out</span><span class="o">.</span><span class="n">strip</span><span class="p">()</span> <span class="o">==</span> <span class="s">&quot;hello&quot;</span>
<span class="go">True</span>
</pre></div>
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</div>
<div class="section" id="py-io-stdcapturefd">
<h3>7.1.2. <tt class="docutils literal"><span class="pre">py.io.StdCaptureFD</span></tt><a class="headerlink" href="#py-io-stdcapturefd" title="Permalink to this headline"></a></h3>
<p>If you also want to capture writes to the stdout/stderr
filedescriptors you may invoke:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="kn">import</span> <span class="nn">py</span><span class="o">,</span> <span class="nn">sys</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">capture</span> <span class="o">=</span> <span class="n">py</span><span class="o">.</span><span class="n">io</span><span class="o">.</span><span class="n">StdCaptureFD</span><span class="p">()</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">sys</span><span class="o">.</span><span class="n">stderr</span><span class="o">.</span><span class="n">write</span><span class="p">(</span><span class="s">&quot;world&quot;</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">out</span><span class="p">,</span><span class="n">err</span> <span class="o">=</span> <span class="n">capture</span><span class="o">.</span><span class="n">reset</span><span class="p">()</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">err</span>
<span class="go">&#39;world&#39;</span>
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<li><a class="reference external" href="">7. py.io</a><ul>
<li><a class="reference external" href="#io-capturing-examples">7.1. IO Capturing examples</a><ul>
<li><a class="reference external" href="#py-io-stdcapture">7.1.1. <tt class="docutils literal"><span class="pre">py.io.StdCapture</span></tt></a></li>
<li><a class="reference external" href="#py-io-stdcapturefd">7.1.2. <tt class="docutils literal"><span class="pre">py.io.StdCaptureFD</span></tt></a></li>
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