第13章 面向对象编程(7)

13.8 静态方法和类方法

13.8.1 staticmethod()和classmethod()内建函数

>>> class C(object):
... 	def M1(self):
... 		pass
... 	
>>> C.M1()
Traceback (most recent call last):
  File "<interactive input>", line 1, in <module>
TypeError: unbound method M1() must be called with C instance as first argument (got nothing instead)
>>> C().M1()
>>> 

>>> class TestStaticMethod:
... 	@staticmethod
... 	def foo():
... 		print 'calling static method foo()'
... 		
>>> TestStaticMethod.foo()
calling static method foo()
>>> class TestClassMethod(object):
... 	@classmethod
... 	def foo(cls):
... 		print 'calling class method foo()'
... 		print 'foo() is a part of class ', cls.__name__ 
... 		
>>> TestClassMethod.foo()
calling class method foo()
foo() is a part of class  TestClassMethod
>>> 

类方法必须传入一个cls参数。