python类方法和普通方法区别

class Apple(object):

        def get_apple(self, n):

                print "apple: %s,%s" % (self,n)

        @classmethod

        def get_class_apple(cls, n):

                print "apple: %s,%s" % (cls,n)

a = Apple()

a.get_apple(2)

apple: <__main__.Apple object at 0x7fa3a9202ed0>,2

print (a.get_apple)

<bound method Apple.get_apple of <__main__.Apple object at 0x7fa3a9202ed0>>

Apple.get_apple(2)

Traceback (most recent call last): File "static.py", line 22, in <module> Apple.get_apple(2) TypeError: unbound method get_apple() must be called with Apple instance as first argument (got int instance instead)

a.get_class_apple(3)

Apple.get_class_apple(3)

apple: <class '__main__.Apple'>,3

apple: <class '__main__.Apple'>,3

print (a.get_class_apple) print (Apple.get_class_apple)

<bound method type.get_class_apple of <class '__main__.Apple'>> <bound method type.get_class_apple of <class '__main__.Apple'>>