Python class methods

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These three words appear in the Python class, and the self and the CLS can be replaced by other words, and there are three methods of the class.

One is defined by Def, the ordinary general, need to pass at least one parameter, generally with self, such a method must be accessed through an instance of a class, similar to C + + through the object to access;

The second is to add @classmethod in front of Def, this kind of method is a feature that can be called by the class name, but also must pass a parameter, generally with the CLS to represent class, that can be called directly through the class;

The third is to add @staticmethod in front of Def, this class method is static class method, similar to C + + static function, one of his characteristics is that the parameter can be empty, also support the class name and object two kinds of call mode;

Code:

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class A:      member = "this is a test."      def __init__(self):          pass      @classmethod      def Print1(cls):          print "print 1: ", cls.member      def Print2(self):          print "print 2: ", self.member      @classmethod          def Print3(paraTest):          print "print 3: ", paraTest.member      @staticmethod      def print4():          print "hello"  a = A()  A.Print1()    a.Print1()  #A.Print2()  a.Print2()  A.Print3()  a.Print3()   

Python class methods