Python中的staticmethod和classmethod 的异同

Python中的staticmethod和classmethod 的异同

class MethodTest():
var1 ="class var"

def__init__(self, var2 = "object var"):
self.var2 = var2

@staticmethod

defstaticFun():
print'static method'

@classmethod

defclassFun(cls):
print 'class method'

staticmethod和classmethod的相同点:

1.都可以通过类或实例调用

mt = MethodTest()

MethodTest.staticFun()

mt.staticFun()

MethodTest.classFun()

mt.classFun()

2.都无法访问实例成员

@staticmethod

defstaticFun():
print var2 //wrong
@classmethod

defclassFun(cls):
print var2 //wrong

staticmethod和classmethod的区别:

1.staticmethod无需参数，classmethod需要类变量作为参数传递（不是类的实例）

defclassFun(cls):
print 'class method' //cls作为类变量传递

2.classmethod可以访问类成员，staticmethod则不可以

@staticmethod

defstaticFun():
print var1 //wrong
@classmethod

defclassFun(cls):
print cls.var1 //right