How did Python find 5 in a dictionary containing 5.0? Python does this in constant time without having to scan through every item by using hash functions. When Python looks up a key foo in a dict, it first comp
Python内置函数repr()和str()分别调用object.repr(self)和object.str(self)方法。第一个函数计算对象的官方表示,而第二个函数返回对象的非正式表示。对于整数对象,这两个函数的结果是相同的。>>> x = 1 >>> repr(x) '1' >>> str(x) '1'
What is the difference between __str__ and __repr__? What is __init__.py for? What does ** (double star/asterisk) and * (star/asterisk) do for parameters? What is the difference between Python's list methods append and extend? What does __all__ mean in Python? What doe...
Why reprex? Getting unstuck is hard. Your first step here is usually to create a reprex, or reproducible example. The goal of a reprex is to package your code, and information about your problem so that others can run it…
Python does the following: Is there a__metaclass__attribute inFoo? If yes, create in memory a class object (I said a class object, stay with me here), with the nameFooby using what is in__metaclass__. If Python can't find__metaclass__, it will look for a__metaclass__at the ...
What does if __name__ == "__main__": do? What is the difference between __str__ and __repr__? What is __init__.py for? What is the meaning of single and double underscore before an object name? What does __all__ mean in Python? Use of *args and **...
Just as for function annotations, the Python interpreter does not attach any particular meaning to variable annotations and only stores them in the __annotations__ attribute of a class or module. In contrast to variable declarations in statically typed languages, the goal of annotation syntax is ...
$ python3 manage.py test [...] OK Our refactor of the code is now complete, and the tests mean we’re happy that behaviour is preserved. Now we can change the tests so that they’re no longer testing constants; instead, they should just check that we’re rendering the right template...
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While some of the examples you see below may not be WTFs in the truest sense, but they'll reveal some of the interesting parts of Python that you might be unaware of. I find it a nice way to learn the internals of a programming language, and I believe that you'll find it ...