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compared python 2 and 3 speeds

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rasbt 2014-05-25 11:44:17 -04:00
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tutorials/key_differences_between_python_2_and_3.html
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<p><strong>Note</strong><br />Some people pointed out the speed difference between Python 3's <code>range()</code> and Python2's <code>xrange()</code>. Since they are implemented the same way one would expect the same speed. However the difference here just comes from the fact that Python 3 generally tends to run slower than Python 2.</p>
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<div class="highlight"><pre><span class="k">def</span> <span class="nf">test_while</span><span class="p">():</span>
<span class="n">i</span> <span class="o">=</span> <span class="mi">0</span>
<span class="k">while</span> <span class="n">i</span> <span class="o">&lt;</span> <span class="mi">20000</span><span class="p">:</span>
<span class="n">i</span> <span class="o">+=</span> <span class="mi">1</span>
<span class="k">return</span>
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<div class="highlight"><pre><span class="k">print</span><span class="p">(</span><span class="s">&#39;Python&#39;</span><span class="p">,</span> <span class="n">python_version</span><span class="p">())</span>
<span class="o">%</span><span class="k">timeit</span> <span class="n">test_while</span><span class="p">()</span>
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Python 3.4.1
100 loops, best of 3: 2.68 ms per loop
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<div class="highlight"><pre><span class="k">print</span> <span class="s">&#39;Python&#39;</span><span class="p">,</span> <span class="n">python_version</span><span class="p">()</span>
<span class="o">%</span><span class="k">timeit</span> <span class="n">test_while</span><span class="p">()</span>
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Python 2.7.6
1000 loops, best of 3: 1.72 ms per loop
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tutorials/key_differences_between_python_2_and_3.ipynb
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