Init__ and arguments in Python?

Python instance methods require the self argument. Class methods take the class as a first argument. Static methods allow you to have no self/cls argument.

Python instance methods require the self argument. Class methods take the class as a first argument. Static methods allow you to have no self/cls argument.

__init__ is a special function and without overriding __new__ it will always be given the instance of the class as its first argument. An example using the builtin classmethod and staticmethod decorators: import sys class Num: max = sys. Maxint def __init__(self,num): self.

N = num def getn(self): return self. N @staticmethod def getone(): return 1 @classmethod def getmax(cls): return cls. Max myObj = Num(3) # with the appropriate decorator these should work fine myObj.getone() myObj.getmax() myObj.getn() That said, I would try to use @classmethod/@staticmethod sparingly.

If you find yourself creating objects that consist of nothing but staticmethods the more pythonic thing to do would be to create a new module of related functions.

Every method needs to accept one argument: The instance itself (or the class if it is a static method). Read more about classes in Python.

In python you must always pass in at least one argument to class methods, the argument is self and it is not meaningless its a reference to the instance itself.

The fact that your method does not use the self argument (which is a reference to the instance that the method is attached to) doesn't mean you can leave it out. It always has to be there, because Python is always going to try to pass it in.

The current object is explicitly passed to the method as the first parameter. Self is the conventional name. You can call it anything you want but it is strongly advised that you stick with this convention to avoid confusion.

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