Python中的classmethod和staticmethod有什么具体用途？

 
class Kls(object):
    def __init__(self, data):
        self.data = data
    def printd(self):
        print(self.data)
ik1 = Kls('arun')
ik2 = Kls('seema')
ik1.printd()
ik2.printd()

@classmethod means: when this method is called, we pass the class as the first argument instead of the instance of that class (as we normally do with methods). This means you can use the class and its properties inside that method rather than a particular instance.

@staticmethod means: when this method is called, we don't pass an instance of the class to it (as we normally do with methods). This means you can put a function inside a class but you can't access the instance of that class (this is useful when your method does not use the instance).

class Utility(object):

    @staticmethod
    def list_all_files_in_dir(dir_path):
        ...
 

from random import choice
COLORS = ['Brown','Black','Golden']

class Animal(object):

    def __init__(self,color):
        self.color = color

    @classmethod
    def make_baby(cls):
        color = choice(COLORS)
        print cls
        return cls(color)

    @staticmethod
    def speak():
        print 'Rora'

class Dog(Animal):

    @staticmethod
    def speak():
        print "Bark!"

    @classmethod
    def make_baby(cls):
        print "making dog baby!"
        print cls
        return super(Dog,cls).make_baby()

class Cat(Animal):
    pass

d = Dog('Brown')
print d.color
pup = d.make_baby()
pup
print pup.color


注意 static method 和 class method 在继承中的区别