Python classmethod装饰器原理及用法解析

英文文档:

classmethod(function)

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, ...): ...
The @classmethod form is a function decorator – see the description of function definitions in Function definitions for details.

It can be called either> >>> class C: @classmethod def f(cls,arg1): print(cls) print(arg1) >>> C.f('类对象调用类方法') <class '__main__.C'> 类对象调用类方法 >>> c = C() >>> c.f('类实例对象调用类方法') <class '__main__.C'> 类实例对象调用类方法

  4. 类被继承后,子类也可以调用父类的类方法,但是第一个参数传入的是子类的类对象

>>> class D(C):
  pass

>>> D.f("子类的类对象调用父类的类方法")
<class '__main__.D'>
子类的类对象调用父类的类方法

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Python classmethod装饰器原理及用法解析

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