python中staticmethod和classmethod的區別

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的相同點:

1.均可以經過類或實例調用

mt = MethodTest()

MethodTest.staticFun()

mt.staticFun()

MethodTest.classFun()

mt.classFun()

2.都沒法訪問實例成員

   @staticmethod

    defstaticFun():
        print var2  //wrong 
   @classmethod

    defclassFun(cls):
       print var2  //wrong

 

staticmethod和classmethod的區別:

1.staticmethod無需參數，classmethod須要類變量做爲參數傳遞（不是類的實例）

    defclassFun(cls):
       print 'class method'  //cls做爲類變量傳遞

2.classmethod能夠訪問類成員，staticmethod則不能夠

   @staticmethod

    defstaticFun():
        print var1  //wrong 
   

    @classmethod

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