methods in python

Methods:

• It is possible to define two kinds of methods with-in a class that can be called without an instance.

Class Method:

• A class method takes cls as first parameter.
• A class method can access or modify class state.
• We use @classmethod decorator in python to create a class method.
• We generally use class method to create factory methods.

Syntax:

class C(object):

    @classmethod

    def fun(cls, arg1, arg2, ...):

       ........................

       ........................

       ........................

Static Method:

• A static method needs no specific parameters.
• A static method can’t access or modify it.
• We use @staticmethod decorator to create a static method in python.
• We generally use static methods to create utility functions.

Syntax:

class C(object):

    @staticmethod

    def fun( arg1, arg2, ...):

       ....................

       ....................

       ....................

Example:

class Test(object):

    x=20

    def m1(self):

        print"hai,i am in instance method"

        print(Test.x)

 

    @classmethod

    def m2(cls):

        print "hai,i am in class method"

        print(Test.x)

 

    @staticmethod

    def m3():

        print "hai,i am in static method"

        print(Test.x)

 

Test.m2()

Test.m3()

Test.m1()