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  <div class="section" id="development-tools">
<span id="development"></span><h1>26. Development Tools<a class="headerlink" href="#development-tools" title="Permalink to this headline">ΒΆ</a></h1>
<p>The modules described in this chapter help you write software.  For example, the
<a title="Documentation generator and online help system." class="reference external" href="pydoc.html#module-pydoc"><tt class="xref docutils literal"><span class="pre">pydoc</span></tt></a> module takes a module and generates documentation based on the
module&#8217;s contents.  The <a title="Test pieces of code within docstrings." class="reference external" href="doctest.html#module-doctest"><tt class="xref docutils literal"><span class="pre">doctest</span></tt></a> and <a title="Unit testing framework for Python." class="reference external" href="unittest.html#module-unittest"><tt class="xref docutils literal"><span class="pre">unittest</span></tt></a> modules contains
frameworks for writing unit tests that automatically exercise code and verify
that the expected output is produced.  <strong>2to3</strong> can translate Python 2.x
source code into valid Python 3.x code.</p>
<p>The list of modules described in this chapter is:</p>
<ul>
<li class="toctree-l1"><a class="reference external" href="pydoc.html">26.1. <tt class="docutils literal"><span class="pre">pydoc</span></tt> &#8212; Documentation generator and online help system</a></li>
<li class="toctree-l1"><a class="reference external" href="doctest.html">26.2. <tt class="docutils literal"><span class="pre">doctest</span></tt> &#8212; Test interactive Python examples</a><ul>
<li class="toctree-l2"><a class="reference external" href="doctest.html#simple-usage-checking-examples-in-docstrings">26.2.1. Simple Usage: Checking Examples in Docstrings</a></li>
<li class="toctree-l2"><a class="reference external" href="doctest.html#simple-usage-checking-examples-in-a-text-file">26.2.2. Simple Usage: Checking Examples in a Text File</a></li>
<li class="toctree-l2"><a class="reference external" href="doctest.html#how-it-works">26.2.3. How It Works</a><ul>
<li class="toctree-l3"><a class="reference external" href="doctest.html#which-docstrings-are-examined">26.2.3.1. Which Docstrings Are Examined?</a></li>
<li class="toctree-l3"><a class="reference external" href="doctest.html#how-are-docstring-examples-recognized">26.2.3.2. How are Docstring Examples Recognized?</a></li>
<li class="toctree-l3"><a class="reference external" href="doctest.html#what-s-the-execution-context">26.2.3.3. What&#8217;s the Execution Context?</a></li>
<li class="toctree-l3"><a class="reference external" href="doctest.html#what-about-exceptions">26.2.3.4. What About Exceptions?</a></li>
<li class="toctree-l3"><a class="reference external" href="doctest.html#option-flags-and-directives">26.2.3.5. Option Flags and Directives</a></li>
<li class="toctree-l3"><a class="reference external" href="doctest.html#warnings">26.2.3.6. Warnings</a></li>
</ul>
</li>
<li class="toctree-l2"><a class="reference external" href="doctest.html#basic-api">26.2.4. Basic API</a></li>
<li class="toctree-l2"><a class="reference external" href="doctest.html#unittest-api">26.2.5. Unittest API</a></li>
<li class="toctree-l2"><a class="reference external" href="doctest.html#advanced-api">26.2.6. Advanced API</a><ul>
<li class="toctree-l3"><a class="reference external" href="doctest.html#doctest-objects">26.2.6.1. DocTest Objects</a></li>
<li class="toctree-l3"><a class="reference external" href="doctest.html#example-objects">26.2.6.2. Example Objects</a></li>
<li class="toctree-l3"><a class="reference external" href="doctest.html#doctestfinder-objects">26.2.6.3. DocTestFinder objects</a></li>
<li class="toctree-l3"><a class="reference external" href="doctest.html#doctestparser-objects">26.2.6.4. DocTestParser objects</a></li>
<li class="toctree-l3"><a class="reference external" href="doctest.html#doctestrunner-objects">26.2.6.5. DocTestRunner objects</a></li>
<li class="toctree-l3"><a class="reference external" href="doctest.html#outputchecker-objects">26.2.6.6. OutputChecker objects</a></li>
</ul>
</li>
<li class="toctree-l2"><a class="reference external" href="doctest.html#debugging">26.2.7. Debugging</a></li>
<li class="toctree-l2"><a class="reference external" href="doctest.html#soapbox">26.2.8. Soapbox</a></li>
</ul>
</li>
<li class="toctree-l1"><a class="reference external" href="unittest.html">26.3. <tt class="docutils literal"><span class="pre">unittest</span></tt> &#8212; Unit testing framework</a><ul>
<li class="toctree-l2"><a class="reference external" href="unittest.html#basic-example">26.3.1. Basic example</a></li>
<li class="toctree-l2"><a class="reference external" href="unittest.html#organizing-test-code">26.3.2. Organizing test code</a></li>
<li class="toctree-l2"><a class="reference external" href="unittest.html#re-using-old-test-code">26.3.3. Re-using old test code</a></li>
<li class="toctree-l2"><a class="reference external" href="unittest.html#classes-and-functions">26.3.4. Classes and functions</a></li>
<li class="toctree-l2"><a class="reference external" href="unittest.html#testcase-objects">26.3.5. TestCase Objects</a></li>
<li class="toctree-l2"><a class="reference external" href="unittest.html#testsuite-objects">26.3.6. TestSuite Objects</a></li>
<li class="toctree-l2"><a class="reference external" href="unittest.html#testresult-objects">26.3.7. TestResult Objects</a></li>
<li class="toctree-l2"><a class="reference external" href="unittest.html#testloader-objects">26.3.8. TestLoader Objects</a></li>
</ul>
</li>
<li class="toctree-l1"><a class="reference external" href="2to3.html">26.4. 2to3 - Automated Python 2 to 3 code translation</a><ul>
<li class="toctree-l2"><a class="reference external" href="2to3.html#using-2to3">26.4.1. Using 2to3</a></li>
<li class="toctree-l2"><a class="reference external" href="2to3.html#fixers">26.4.2. Fixers</a></li>
<li class="toctree-l2"><a class="reference external" href="2to3.html#module-lib2to3">26.4.3. <tt class="docutils literal"><span class="pre">lib2to3</span></tt> - 2to3&#8217;s library</a></li>
</ul>
</li>
<li class="toctree-l1"><a class="reference external" href="test.html">26.5. <tt class="docutils literal"><span class="pre">test</span></tt> &#8212; Regression tests package for Python</a><ul>
<li class="toctree-l2"><a class="reference external" href="test.html#writing-unit-tests-for-the-test-package">26.5.1. Writing Unit Tests for the <tt class="docutils literal"><span class="pre">test</span></tt> package</a></li>
<li class="toctree-l2"><a class="reference external" href="test.html#running-tests-using-test-regrtest">26.5.2. Running tests using <tt class="docutils literal"><span class="pre">test.regrtest</span></tt></a></li>
</ul>
</li>
<li class="toctree-l1"><a class="reference external" href="test.html#module-test.test_support">26.6. <tt class="docutils literal"><span class="pre">test.test_support</span></tt> &#8212; Utility functions for tests</a></li>
</ul>
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