python函数-classmethod()

classmethod(function)

中文说明：

classmethod是用来指定一个类的方法为类方法，没有此参数指定的类的方法为实例方法，使用方法如下：

class C:
    @classmethod
    def f(cls, arg1, arg2, ...): ... 

英文说明：

Return a class method for function.

A class method receives the class as implicit first argument, just like an instance method receives the instance. To declare a class method, use this idiom:

class C:
    @classmethod
    def f(cls, arg1, arg2, ...): ... 

代码实例：

>>> class C:
...     @classmethod
...     def f(self):
...             print "This is a class method"
...
>>> C.f()
This is a class method
>>> c = C()
>>> c.f()
This is a class method
>>> class D:
...     def f(self):
...             print " This is not a class method "
...
>>> D.f()
Traceback (most recent call last):
  File " ", line 1, in  
TypeError: unbound method f() must be called with D instance as first argument (got nothing instead)
>>> d = D()
>>> d.f()
This is not a class method 

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