By Luciano Ramalho
Python's simplicity helps you to develop into efficient quick, yet this frequently capacity you are not utilizing every little thing it has to supply. With this hands-on advisor, you are going to how to write powerful, idiomatic Python code by way of leveraging its most sensible - and doubtless such a lot ignored - gains. writer Luciano Ramalho takes you thru Python's center language positive factors and libraries, and indicates you the way to make your code shorter, quicker, and extra readable whilst. Many skilled programmers try and bend Python to slot styles they realized from different languages, and not become aware of Python gains outdoor in their event. With this publication, these Python programmers will completely how to develop into expert in Python three.
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So you can build multi-line lists, listcomps, genexps, dictionaries etc. without using the ugly \ line continuation escape. x, variables assigned in the for clauses in list comprehensions were set in the surrounding scope, sometimes with tragic consequences. 2] on linux2 Type "help", "copyright", "credits" or "license" for more information. >>> x = 'my precious' >>> dummy = [x for x in 'ABC'] >>> x 'C' As you can see, the initial value of x was clobbered. This no longer happens in Python 3. List comprehensions, generator expressions and their siblings set and dict comprehen‐ sions now have their own local scope, like functions.
2. choice function. But it gets better. _cards, our deck auto‐ matically supports slicing. Here’s how we look at the top three cards from a brand new deck, and then pick just the aces by starting on index 12 and skipping 13 cards at a time: >>> deck[:3] [Card(rank='2', suit='spades'), Card(rank='3', suit='spades'), Card(rank='4', suit='spades')] >>> deck[12::13] [Card(rank='A', suit='spades'), Card(rank='A', suit='diamonds'), Card(rank='A', suit='clubs'), Card(rank='A', suit='hearts')] Just by implementing the __getitem__ special method, our deck is also iterable: >>> for card in deck: # doctest: +ELLIPSIS ...
Y * scalar) Note that although we implemented four special methods (apart from __init__), none of them is directly called within the class or in the typical usage of the class illustrated by the console listings. info caller of most special methods. In the next sections we discuss the code for each special method. String representation The __repr__ special method is called by the repr built-in to get string representation of the object for inspection. If we did not implement __repr__, vector instances would be shown in the console like