minirst: improve layout of field lists
Before, we used the padding following the key to compute where to wrap
the text. Long keys would thus give a big indentation. It also
required careful alignment of the source text, making it cumbersome to
items to the list.
We now compute the maximum key length and use that for all items in
the list. We also put a cap on the indentation: keys longer than 10
characters are put on their own line. This is similar to how rst2html
handles large keys: it uses 14 as the cutoff point, but I felt that 10
was better for monospaced text in the console.
adding primes.py
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<div class="parity0 source"><a href="#l1" id="l1"> 1</a> <span class="c">#!/usr/bin/env python</span></div>
<div class="parity1 source"><a href="#l2" id="l2"> 2</a> </div>
<div class="parity0 source"><a href="#l3" id="l3"> 3</a> <span class="sd">"""Fun with generators. Corresponding Haskell implementation:</span></div>
<div class="parity1 source"><a href="#l4" id="l4"> 4</a> </div>
<div class="parity0 source"><a href="#l5" id="l5"> 5</a> <span class="sd">primes = 2 : sieve [3, 5..]</span></div>
<div class="parity1 source"><a href="#l6" id="l6"> 6</a> <span class="sd"> where sieve (p:ns) = p : sieve [n | n <- ns, mod n p /= 0]</span></div>
<div class="parity0 source"><a href="#l7" id="l7"> 7</a> <span class="sd">"""</span></div>
<div class="parity1 source"><a href="#l8" id="l8"> 8</a> </div>
<div class="parity0 source"><a href="#l9" id="l9"> 9</a> <span class="kn">from</span> <span class="nn">itertools</span> <span class="kn">import</span> <span class="n">dropwhile</span><span class="p">,</span> <span class="n">ifilter</span><span class="p">,</span> <span class="n">islice</span><span class="p">,</span> <span class="n">count</span><span class="p">,</span> <span class="n">chain</span></div>
<div class="parity1 source"><a href="#l10" id="l10"> 10</a> </div>
<div class="parity0 source"><a href="#l11" id="l11"> 11</a> <span class="kn">def</span> <span class="nf">primes</span><span class="p">():</span></div>
<div class="parity1 source"><a href="#l12" id="l12"> 12</a> <span class="sd">"""Generate all primes."""</span></div>
<div class="parity0 source"><a href="#l13" id="l13"> 13</a> <span class="kn">def</span> <span class="nf">sieve</span><span class="p">(</span><span class="n">ns</span><span class="p">):</span></div>
<div class="parity1 source"><a href="#l14" id="l14"> 14</a> <span class="n">p</span> <span class="o">=</span> <span class="n">ns</span><span class="o">.</span><span class="n">next</span><span class="p">()</span></div>
<div class="parity0 source"><a href="#l15" id="l15"> 15</a> <span class="c"># It is important to yield *here* in order to stop the</span></div>
<div class="parity1 source"><a href="#l16" id="l16"> 16</a> <span class="c"># infinite recursion.</span></div>
<div class="parity0 source"><a href="#l17" id="l17"> 17</a> <span class="kn">yield</span> <span class="n">p</span></div>
<div class="parity1 source"><a href="#l18" id="l18"> 18</a> <span class="n">ns</span> <span class="o">=</span> <span class="n">ifilter</span><span class="p">(</span><span class="kn">lambda</span> <span class="n">n</span><span class="p">:</span> <span class="n">n</span> <span class="o">%</span> <span class="n">p</span> <span class="o">!=</span> <span class="mi">0</span><span class="p">,</span> <span class="n">ns</span><span class="p">)</span></div>
<div class="parity0 source"><a href="#l19" id="l19"> 19</a> <span class="kn">for</span> <span class="n">n</span> <span class="ow">in</span> <span class="n">sieve</span><span class="p">(</span><span class="n">ns</span><span class="p">):</span></div>
<div class="parity1 source"><a href="#l20" id="l20"> 20</a> <span class="kn">yield</span> <span class="n">n</span></div>
<div class="parity0 source"><a href="#l21" id="l21"> 21</a> </div>
<div class="parity1 source"><a href="#l22" id="l22"> 22</a> <span class="n">odds</span> <span class="o">=</span> <span class="n">ifilter</span><span class="p">(</span><span class="kn">lambda</span> <span class="n">i</span><span class="p">:</span> <span class="n">i</span> <span class="o">%</span> <span class="mi">2</span> <span class="o">==</span> <span class="mi">1</span><span class="p">,</span> <span class="n">count</span><span class="p">())</span></div>
<div class="parity0 source"><a href="#l23" id="l23"> 23</a> <span class="kn">return</span> <span class="n">chain</span><span class="p">([</span><span class="mi">2</span><span class="p">],</span> <span class="n">sieve</span><span class="p">(</span><span class="n">dropwhile</span><span class="p">(</span><span class="kn">lambda</span> <span class="n">n</span><span class="p">:</span> <span class="n">n</span> <span class="o"><</span> <span class="mi">3</span><span class="p">,</span> <span class="n">odds</span><span class="p">)))</span></div>
<div class="parity1 source"><a href="#l24" id="l24"> 24</a> </div>
<div class="parity0 source"><a href="#l25" id="l25"> 25</a> <span class="kn">if</span> <span class="n">__name__</span> <span class="o">==</span> <span class="s">"__main__"</span><span class="p">:</span></div>
<div class="parity1 source"><a href="#l26" id="l26"> 26</a> <span class="kn">import</span> <span class="nn">sys</span></div>
<div class="parity0 source"><a href="#l27" id="l27"> 27</a> <span class="kn">try</span><span class="p">:</span></div>
<div class="parity1 source"><a href="#l28" id="l28"> 28</a> <span class="n">n</span> <span class="o">=</span> <span class="nb">int</span><span class="p">(</span><span class="n">sys</span><span class="o">.</span><span class="n">argv</span><span class="p">[</span><span class="mi">1</span><span class="p">])</span></div>
<div class="parity0 source"><a href="#l29" id="l29"> 29</a> <span class="kn">except</span> <span class="p">(</span><span class="ne">ValueError</span><span class="p">,</span> <span class="ne">IndexError</span><span class="p">):</span></div>
<div class="parity1 source"><a href="#l30" id="l30"> 30</a> <span class="n">n</span> <span class="o">=</span> <span class="mi">10</span></div>
<div class="parity0 source"><a href="#l31" id="l31"> 31</a> <span class="n">p</span> <span class="o">=</span> <span class="n">primes</span><span class="p">()</span></div>
<div class="parity1 source"><a href="#l32" id="l32"> 32</a> <span class="kn">print</span> <span class="s">"The first </span><span class="si">%d</span><span class="s"> primes: </span><span class="si">%s</span><span class="s">"</span> <span class="o">%</span> <span class="p">(</span><span class="n">n</span><span class="p">,</span> <span class="nb">list</span><span class="p">(</span><span class="n">islice</span><span class="p">(</span><span class="n">p</span><span class="p">,</span> <span class="n">n</span><span class="p">)))</span></div>
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<h3>annotate primes.py @ 0:853dcd4de2a6</h3>
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<td class="source"><a href="#l1" id="l1"> 1</a> <span class="c">#!/usr/bin/env python</span></td>
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<td class="source"><a href="#l2" id="l2"> 2</a> </td>
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<a href="/annotate/853dcd4de2a6/primes.py#3"
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<td class="source"><a href="#l3" id="l3"> 3</a> <span class="sd">"""Fun with generators. Corresponding Haskell implementation:</span></td>
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title="853dcd4de2a6: a">test@0</a>
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<td class="source"><a href="#l4" id="l4"> 4</a> </td>
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<a href="/annotate/853dcd4de2a6/primes.py#5"
title="853dcd4de2a6: a">test@0</a>
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<td class="source"><a href="#l5" id="l5"> 5</a> <span class="sd">primes = 2 : sieve [3, 5..]</span></td>
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<a href="/annotate/853dcd4de2a6/primes.py#6"
title="853dcd4de2a6: a">test@0</a>
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<td class="source"><a href="#l6" id="l6"> 6</a> <span class="sd"> where sieve (p:ns) = p : sieve [n | n <- ns, mod n p /= 0]</span></td>
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<a href="/annotate/853dcd4de2a6/primes.py#7"
title="853dcd4de2a6: a">test@0</a>
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<td class="source"><a href="#l7" id="l7"> 7</a> <span class="sd">"""</span></td>
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<a href="/annotate/853dcd4de2a6/primes.py#8"
title="853dcd4de2a6: a">test@0</a>
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<td class="source"><a href="#l8" id="l8"> 8</a> </td>
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<a href="/annotate/853dcd4de2a6/primes.py#9"
title="853dcd4de2a6: a">test@0</a>
</td>
<td class="source"><a href="#l9" id="l9"> 9</a> <span class="kn">from</span> <span class="nn">itertools</span> <span class="kn">import</span> <span class="n">dropwhile</span><span class="p">,</span> <span class="n">ifilter</span><span class="p">,</span> <span class="n">islice</span><span class="p">,</span> <span class="n">count</span><span class="p">,</span> <span class="n">chain</span></td>
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title="853dcd4de2a6: a">test@0</a>
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<td class="source"><a href="#l10" id="l10"> 10</a> </td>
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<a href="/annotate/853dcd4de2a6/primes.py#11"
title="853dcd4de2a6: a">test@0</a>
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<td class="source"><a href="#l11" id="l11"> 11</a> <span class="kn">def</span> <span class="nf">primes</span><span class="p">():</span></td>
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<a href="/annotate/853dcd4de2a6/primes.py#12"
title="853dcd4de2a6: a">test@0</a>
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<td class="source"><a href="#l12" id="l12"> 12</a> <span class="sd">"""Generate all primes."""</span></td>
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<a href="/annotate/853dcd4de2a6/primes.py#13"
title="853dcd4de2a6: a">test@0</a>
</td>
<td class="source"><a href="#l13" id="l13"> 13</a> <span class="kn">def</span> <span class="nf">sieve</span><span class="p">(</span><span class="n">ns</span><span class="p">):</span></td>
</tr>
<tr class="parity1">
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<a href="/annotate/853dcd4de2a6/primes.py#14"
title="853dcd4de2a6: a">test@0</a>
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<td class="source"><a href="#l14" id="l14"> 14</a> <span class="n">p</span> <span class="o">=</span> <span class="n">ns</span><span class="o">.</span><span class="n">next</span><span class="p">()</span></td>
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<a href="/annotate/853dcd4de2a6/primes.py#15"
title="853dcd4de2a6: a">test@0</a>
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<td class="source"><a href="#l15" id="l15"> 15</a> <span class="c"># It is important to yield *here* in order to stop the</span></td>
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<a href="/annotate/853dcd4de2a6/primes.py#16"
title="853dcd4de2a6: a">test@0</a>
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<td class="source"><a href="#l16" id="l16"> 16</a> <span class="c"># infinite recursion.</span></td>
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<a href="/annotate/853dcd4de2a6/primes.py#17"
title="853dcd4de2a6: a">test@0</a>
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<td class="source"><a href="#l17" id="l17"> 17</a> <span class="kn">yield</span> <span class="n">p</span></td>
</tr>
<tr class="parity1">
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<a href="/annotate/853dcd4de2a6/primes.py#18"
title="853dcd4de2a6: a">test@0</a>
</td>
<td class="source"><a href="#l18" id="l18"> 18</a> <span class="n">ns</span> <span class="o">=</span> <span class="n">ifilter</span><span class="p">(</span><span class="kn">lambda</span> <span class="n">n</span><span class="p">:</span> <span class="n">n</span> <span class="o">%</span> <span class="n">p</span> <span class="o">!=</span> <span class="mf">0</span><span class="p">,</span> <span class="n">ns</span><span class="p">)</span></td>
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<a href="/annotate/853dcd4de2a6/primes.py#19"
title="853dcd4de2a6: a">test@0</a>
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<td class="source"><a href="#l19" id="l19"> 19</a> <span class="kn">for</span> <span class="n">n</span> <span class="ow">in</span> <span class="n">sieve</span><span class="p">(</span><span class="n">ns</span><span class="p">):</span></td>
</tr>
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<td class="annotate">
<a href="/annotate/853dcd4de2a6/primes.py#20"
title="853dcd4de2a6: a">test@0</a>
</td>
<td class="source"><a href="#l20" id="l20"> 20</a> <span class="kn">yield</span> <span class="n">n</span></td>
</tr>
<tr class="parity0">
<td class="annotate">
<a href="/annotate/853dcd4de2a6/primes.py#21"
title="853dcd4de2a6: a">test@0</a>
</td>
<td class="source"><a href="#l21" id="l21"> 21</a> </td>
</tr>
<tr class="parity1">
<td class="annotate">
<a href="/annotate/853dcd4de2a6/primes.py#22"
title="853dcd4de2a6: a">test@0</a>
</td>
<td class="source"><a href="#l22" id="l22"> 22</a> <span class="n">odds</span> <span class="o">=</span> <span class="n">ifilter</span><span class="p">(</span><span class="kn">lambda</span> <span class="n">i</span><span class="p">:</span> <span class="n">i</span> <span class="o">%</span> <span class="mf">2</span> <span class="o">==</span> <span class="mf">1</span><span class="p">,</span> <span class="n">count</span><span class="p">())</span></td>
</tr>
<tr class="parity0">
<td class="annotate">
<a href="/annotate/853dcd4de2a6/primes.py#23"
title="853dcd4de2a6: a">test@0</a>
</td>
<td class="source"><a href="#l23" id="l23"> 23</a> <span class="kn">return</span> <span class="n">chain</span><span class="p">([</span><span class="mf">2</span><span class="p">],</span> <span class="n">sieve</span><span class="p">(</span><span class="n">dropwhile</span><span class="p">(</span><span class="kn">lambda</span> <span class="n">n</span><span class="p">:</span> <span class="n">n</span> <span class="o"><</span> <span class="mf">3</span><span class="p">,</span> <span class="n">odds</span><span class="p">)))</span></td>
</tr>
<tr class="parity1">
<td class="annotate">
<a href="/annotate/853dcd4de2a6/primes.py#24"
title="853dcd4de2a6: a">test@0</a>
</td>
<td class="source"><a href="#l24" id="l24"> 24</a> </td>
</tr>
<tr class="parity0">
<td class="annotate">
<a href="/annotate/853dcd4de2a6/primes.py#25"
title="853dcd4de2a6: a">test@0</a>
</td>
<td class="source"><a href="#l25" id="l25"> 25</a> <span class="kn">if</span> <span class="n">__name__</span> <span class="o">==</span> <span class="s">"__main__"</span><span class="p">:</span></td>
</tr>
<tr class="parity1">
<td class="annotate">
<a href="/annotate/853dcd4de2a6/primes.py#26"
title="853dcd4de2a6: a">test@0</a>
</td>
<td class="source"><a href="#l26" id="l26"> 26</a> <span class="kn">import</span> <span class="nn">sys</span></td>
</tr>
<tr class="parity0">
<td class="annotate">
<a href="/annotate/853dcd4de2a6/primes.py#27"
title="853dcd4de2a6: a">test@0</a>
</td>
<td class="source"><a href="#l27" id="l27"> 27</a> <span class="kn">try</span><span class="p">:</span></td>
</tr>
<tr class="parity1">
<td class="annotate">
<a href="/annotate/853dcd4de2a6/primes.py#28"
title="853dcd4de2a6: a">test@0</a>
</td>
<td class="source"><a href="#l28" id="l28"> 28</a> <span class="n">n</span> <span class="o">=</span> <span class="nb">int</span><span class="p">(</span><span class="n">sys</span><span class="o">.</span><span class="n">argv</span><span class="p">[</span><span class="mf">1</span><span class="p">])</span></td>
</tr>
<tr class="parity0">
<td class="annotate">
<a href="/annotate/853dcd4de2a6/primes.py#29"
title="853dcd4de2a6: a">test@0</a>
</td>
<td class="source"><a href="#l29" id="l29"> 29</a> <span class="kn">except</span> <span class="p">(</span><span class="ne">ValueError</span><span class="p">,</span> <span class="ne">IndexError</span><span class="p">):</span></td>
</tr>
<tr class="parity1">
<td class="annotate">
<a href="/annotate/853dcd4de2a6/primes.py#30"
title="853dcd4de2a6: a">test@0</a>
</td>
<td class="source"><a href="#l30" id="l30"> 30</a> <span class="n">n</span> <span class="o">=</span> <span class="mf">10</span></td>
</tr>
<tr class="parity0">
<td class="annotate">
<a href="/annotate/853dcd4de2a6/primes.py#31"
title="853dcd4de2a6: a">test@0</a>
</td>
<td class="source"><a href="#l31" id="l31"> 31</a> <span class="n">p</span> <span class="o">=</span> <span class="n">primes</span><span class="p">()</span></td>
</tr>
<tr class="parity1">
<td class="annotate">
<a href="/annotate/853dcd4de2a6/primes.py#32"
title="853dcd4de2a6: a">test@0</a>
</td>
<td class="source"><a href="#l32" id="l32"> 32</a> <span class="kn">print</span> <span class="s">"The first </span><span class="si">%d</span><span class="s"> primes: </span><span class="si">%s</span><span class="s">"</span> <span class="o">%</span> <span class="p">(</span><span class="n">n</span><span class="p">,</span> <span class="nb">list</span><span class="p">(</span><span class="n">islice</span><span class="p">(</span><span class="n">p</span><span class="p">,</span> <span class="n">n</span><span class="p">)))</span></td>
</tr>
</table>
</div>
</div>
</div>
</body>
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<div class="parity0 source"><a href="#l1" id="l1"> 1</a> ??</div>
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