view tests/test-highlight.out @ 11736:c00f03a4982e stable 1.6.2

i18n-pt_BR: synchronized with 87dcf758309d
author Wagner Bruna <wbruna@yahoo.com>
date Mon, 02 Aug 2010 13:18:32 -0300
parents 4d9dea174b84
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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">&quot;&quot;&quot;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 &lt;- ns, mod n p /= 0]</span></div>
<div class="parity0 source"><a href="#l7" id="l7">     7</a> <span class="sd">&quot;&quot;&quot;</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">&quot;&quot;&quot;Generate all primes.&quot;&quot;&quot;</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">&lt;</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">&quot;__main__&quot;</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">&quot;The first </span><span class="si">%d</span><span class="s"> primes: </span><span class="si">%s</span><span class="s">&quot;</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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<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"
title="853dcd4de2a6: a">test@0</a>
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<td class="source"><a href="#l3" id="l3">     3</a> <span class="sd">&quot;&quot;&quot;Fun with generators. Corresponding Haskell implementation:</span></td>
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<a href="/annotate/853dcd4de2a6/primes.py#4"
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<td class="source"><a href="#l4" id="l4">     4</a> </td>
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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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<td class="source"><a href="#l6" id="l6">     6</a> <span class="sd">    where sieve (p:ns) = p : sieve [n | n &lt;- ns, mod n p /= 0]</span></td>
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<td class="source"><a href="#l7" id="l7">     7</a> <span class="sd">&quot;&quot;&quot;</span></td>
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<a href="/annotate/853dcd4de2a6/primes.py#8"
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<td class="source"><a href="#l8" id="l8">     8</a> </td>
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title="853dcd4de2a6: a">test@0</a>
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<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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<td class="source"><a href="#l10" id="l10">    10</a> </td>
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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">&quot;&quot;&quot;Generate all primes.&quot;&quot;&quot;</span></td>
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<a href="/annotate/853dcd4de2a6/primes.py#13"
title="853dcd4de2a6: a">test@0</a>
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<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>
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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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<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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<td class="source"><a href="#l16" id="l16">    16</a>         <span class="c"># infinite recursion.</span></td>
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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>
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<a href="/annotate/853dcd4de2a6/primes.py#18"
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<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>
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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>
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<a href="/annotate/853dcd4de2a6/primes.py#21"
title="853dcd4de2a6: a">test@0</a>
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<td class="source"><a href="#l21" id="l21">    21</a> </td>
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<a href="/annotate/853dcd4de2a6/primes.py#22"
title="853dcd4de2a6: a">test@0</a>
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<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>
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<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">&lt;</span> <span class="mf">3</span><span class="p">,</span> <span class="n">odds</span><span class="p">)))</span></td>
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<a href="/annotate/853dcd4de2a6/primes.py#24"
title="853dcd4de2a6: a">test@0</a>
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<td class="source"><a href="#l24" id="l24">    24</a> </td>
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<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">&quot;__main__&quot;</span><span class="p">:</span></td>
</tr>
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<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">&quot;The first </span><span class="si">%d</span><span class="s"> primes: </span><span class="si">%s</span><span class="s">&quot;</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>



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