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13638960
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2012-11-30T04:22:03.457
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2012-11-30T04:22:03.457
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2012-11-30T04:22:03.457
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13638898
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259
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text
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You can read about the changes in <a href="http://docs.python.org/3.0/whatsnew/3.0.html">What's New In Python 3.0</a>. You should read it thoroughly when you move from 2.x to 3.x since a lot has been changed. The whole answer here are quotes from the documentation. <a href="http://docs.python.org/3.0/whatsnew/3.0.html#views-and-iterators-instead-of-lists">Views And Iterators Instead Of Lists</a> <blockquote> Some well-known APIs no longer return lists: <ul> <li>[...]</li> <li><a href="http://docs.python.org/3.0/library/functions.html#map"><code>map()</code></a> and <a href="http://docs.python.org/3.0/library/functions.html#filter"><code>filter()</code></a> return iterators. If you really need a list, a quick fix is e.g. <code>list(map(...))</code>, but a better fix is often to use a list comprehension (especially when the original code uses lambda), or rewriting the code so it doesn’t need a list at all. Particularly tricky is <code>map()</code> invoked for the side effects of the function; the correct transformation is to use a regular <code>for</code> loop (since creating a list would just be wasteful).</li> <li>[...]</li> </ul> </blockquote> <a href="http://docs.python.org/3.0/whatsnew/3.0.html#builtins">Builtins</a> <blockquote> <ul> <li>[...]</li> <li>Removed <code>reduce()</code>. Use <a href="http://docs.python.org/3.0/library/functools.html#functools.reduce"><code>functools.reduce()</code></a> if you really need it; however, 99 percent of the time an explicit <code>for</code> loop is more readable.</li> <li>[...]</li> </ul> </blockquote>
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