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<title>Example for syntax highlight with Pygments</title>
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<body>
<div class="document" id="example-for-syntax-highlight-with-pygments">
<h1 class="title">Example for syntax highlight with Pygments</h1>
<p>Translate this document to HTML with a pygments enhanced frontend:</p>
<pre class="literal-block">
rst2html-pygments --stylesheet=pygments-default.css
</pre>
<p>or to LaTeX with:</p>
<pre class="literal-block">
rst2latex-pygments --stylesheet=pygments-default.sty
</pre>
<p>to gain syntax highlight in the output.</p>
<p>Convert between text <-> code source formats with:</p>
<pre class="literal-block">
pylit --code-block-marker='.. code-block:: python'
</pre>
<p>Run the doctests with:</p>
<pre class="literal-block">
pylit --doctest for-else-test.py
</pre>
<div class="section">
<h1><a id="for-else-test" name="for-else-test">for-else-test</a></h1>
<p>Test the flow in a <cite>for</cite> loop with <cite>else</cite> statement.</p>
<p>First define a simple <cite>for</cite> loop.</p>
<div class="highlight"><pre><span class="k">def</span> <span class="nf">loop1</span><span class="p">(</span><span class="n">iterable</span><span class="p">):</span>
<span class="sd">"""simple for loop with `else` statement"""</span>
<span class="k">for</span> <span class="n">i</span> <span class="ow">in</span> <span class="n">iterable</span><span class="p">:</span>
<span class="k">print</span> <span class="n">i</span>
<span class="k">else</span><span class="p">:</span>
<span class="k">print</span> <span class="s">"iterable empty"</span>
<span class="k">print</span> <span class="s">"Ende"</span>
</pre></div>
<p>Now test it:</p>
<p>The first test runs as I expect: iterator empty -> else clause applies:</p>
<div class="highlight"><pre><span class="gp">>>> </span><span class="nb">execfile</span><span class="p">(</span><span class="s">'for-else-test.py'</span><span class="p">)</span>
<span class="gp">>>> </span><span class="n">loop1</span><span class="p">(</span><span class="nb">range</span><span class="p">(</span><span class="mi">0</span><span class="p">))</span>
<span class="go">iterable empty</span>
<span class="go">Ende</span>
</pre></div>
<p>However, the else clause even runs if the iterator is not empty in the first
place but after it is "spent":</p>
<div class="highlight"><pre><span class="gp">>>> </span><span class="n">loop1</span><span class="p">(</span><span class="nb">range</span><span class="p">(</span><span class="mi">3</span><span class="p">))</span>
<span class="go">0</span>
<span class="go">1</span>
<span class="go">2</span>
<span class="go">iterable empty</span>
<span class="go">Ende</span>
</pre></div>
<p>It seems like the else clause can only be prevented, if we break out of
the loop. Let's try</p>
<div class="highlight"><pre><span class="k">def</span> <span class="nf">loop2</span><span class="p">(</span><span class="n">iterable</span><span class="p">):</span>
<span class="sd">"""for loop with `break` and `else` statement"""</span>
<span class="k">for</span> <span class="n">i</span> <span class="ow">in</span> <span class="n">iterable</span><span class="p">:</span>
<span class="k">print</span> <span class="n">i</span>
<span class="k">break</span>
<span class="k">else</span><span class="p">:</span>
<span class="k">print</span> <span class="s">"iterable empty"</span>
<span class="k">print</span> <span class="s">"Ende"</span>
</pre></div>
<p>And indeed, the else clause is skipped after breaking out of the loop:</p>
<div class="highlight"><pre><span class="gp">>>> </span><span class="n">loop2</span><span class="p">(</span><span class="nb">range</span><span class="p">(</span><span class="mi">3</span><span class="p">))</span>
<span class="go">0</span>
<span class="go">Ende</span>
</pre></div>
<p>The empty iterator runs as expected:</p>
<div class="highlight"><pre><span class="gp">>>> </span><span class="n">loop2</span><span class="p">(</span><span class="nb">range</span><span class="p">(</span><span class="mi">0</span><span class="p">))</span>
<span class="go">iterable empty</span>
<span class="go">Ende</span>
</pre></div>
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Generated on: 2007-06-21.
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