类方法、静态方法、属性

类方法：

@classmethod

添加classmethod的方法，即类方法，无法访问实例中的变量。
例：

class Animal(object):    def __init__(self, name):        self.name = name    @classmethod    def talk(self):        print('%s is talking...' % self.name)d = Animal('Ivien')d.talk()# Traceback (most recent call last):#   File "D:/python/oldboy/DAY07/CPRAC.py", line 11, in <module>#     d.talk()#   File "D:/python/oldboy/DAY07/CPRAC.py", line 7, in talk#     print('%s is talking...' % self.name)# AttributeError: type object 'Animal' has no attribute 'name'## Process finished with exit code 1

静态方法

@staticmethod

添加了@staticmethod的方法为静态方法，既无法访问类变量也无法访问实例变量。
例：

class Animal(object):    def __init__(self, name):        self.name = name    @staticmethod    def walk(self):        print('%s is walking ...' % self.name)d = Animal('Ivien')d.walk()# Traceback (most recent call last):#   File "D:/python/oldboy/DAY07/CPRAC.py", line 9, in <module>#     d.walk()# TypeError: walk() missing 1 required positional argument: 'self'

属性

    @property

将方法转换为属性
例：

class Animal(object):    def __init__(self, name):        self.name = name    animal_number = 9    @property    def count(self):        print('There are %s ' % Animal.animal_number)    @count.setter    def count(self, ani_num):        Animal.animal_number = ani_num        print('ani_num :', Animal.animal_number)    @count.deleter    def count(self):        del Animal.animal_number        print('animal_number deleted')d = Animal('Ivien')d.countd.count = 3d.countdel d.count# There are 9# ani_num : 3# There are 3# animal_number deletedprint(d.count)# Traceback (most recent call last):#   File "D:/python/oldboy/DAY07/CPRAC.py", line 28, in <module>#     print(d.count)#   File "D:/python/oldboy/DAY07/CPRAC.py", line 9, in count#     print('There are %s ' % Animal.animal_number)# AttributeError: type object 'Animal' has no attribute 'animal_number'