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476 | 476 | <num> = sum(<collection>) <span class="hljs-comment"># Also math.prod(<collection>).</span>
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477 | 477 | </code></pre></div>
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478 | 478 |
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479 |
| -<div><h3 id="math">Math</h3><pre><code class="python language-python hljs"><span class="hljs-keyword">from</span> math <span class="hljs-keyword">import</span> e, pi, inf, nan, isnan <span class="hljs-comment"># `inf*0` and `nan+1` return nan.</span> |
| 479 | +<div><h3 id="math">Math</h3><pre><code class="python language-python hljs"><span class="hljs-keyword">from</span> math <span class="hljs-keyword">import</span> pi, inf, nan, isnan <span class="hljs-comment"># `inf*0` and `nan+1` return nan.</span> |
480 | 480 | <span class="hljs-keyword">from</span> math <span class="hljs-keyword">import</span> sqrt, factorial <span class="hljs-comment"># `sqrt(-1)` raises ValueError.</span>
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481 | 481 | <span class="hljs-keyword">from</span> math <span class="hljs-keyword">import</span> sin, cos, tan <span class="hljs-comment"># Also: asin, degrees, radians.</span>
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482 | 482 | <span class="hljs-keyword">from</span> math <span class="hljs-keyword">import</span> log, log10, log2 <span class="hljs-comment"># Log accepts base as second arg.</span>
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523 | 523 | </code></pre>
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524 | 524 | <pre><code class="python language-python hljs"><span class="hljs-meta">>>> </span>list(it.combinations(<span class="hljs-string">'abc'</span>, <span class="hljs-number">2</span>)) <span class="hljs-comment"># a b c</span>
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525 | 525 | [(<span class="hljs-string">'a'</span>, <span class="hljs-string">'b'</span>), (<span class="hljs-string">'a'</span>, <span class="hljs-string">'c'</span>), <span class="hljs-comment"># a . x x</span>
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526 |
| - (<span class="hljs-string">'b'</span>, <span class="hljs-string">'c'</span>), <span class="hljs-comment"># b . . x</span> |
| 526 | + (<span class="hljs-string">'b'</span>, <span class="hljs-string">'c'</span>) <span class="hljs-comment"># b . . x</span> |
527 | 527 | ] <span class="hljs-comment"># c . . .</span>
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528 | 528 | </code></pre>
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529 | 529 | <div><h2 id="datetime"><a href="#datetime" name="datetime">#</a>Datetime</h2><p><strong>Provides 'date', 'time', 'datetime' and 'timedelta' classes. All are immutable and hashable.</strong></p><pre><code class="python language-python hljs"><span class="hljs-comment"># $ pip3 install python-dateutil</span>
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