类相关

@property

class User:
    __key = 'abc'  # 只能在类内调用 

    def __init__(self,name, password):
        self.name = name
        self.__passwd = password  # 只能在类内调用 

    @property
    def passwd(self):
        return self.__passwd

    @passwd.setter
    def passwd(self, value):  # obj.passwd = xxx 的时候执行
        self.__passwd = value
        
    @passwd.deleter
    def passwd(self):  # del obj.passwd 时候执行
        self.__passwd = 0

user = User('lee', 123456)

# print(user.__passwd) 无法调用

print(user.passwd)  # @property

 

user.passwd=1234 # @passwd.setter

print(user.passwd)

 

del user.passwd  # @passwd.deleter

print(user.passwd)

 

@classmethod

class ClassMethod:
    age = 1
    def __init__(self, name):
        self.name = name

    @classmethod
    def tell(cls):
        print('类方法')
        print(cls)
        print(cls.age)

a =ClassMethod('lee')
ClassMethod.tell()

 

@staticmethod

class StaticMethod:
    age = 1
    def __init__(self, name):
        self.name = name

    @staticmethod
    def tell(a, b):
        print(a, b)


a = StaticMethod('lee')
a.tell('165', '18')  # 165 18
StaticMethod.tell('165', '18')  # 165 18

 

自省

class User:
    age = 18
    def __init__(self, name):
        self.name = name

    def tell(self):
        return '请给我打钱'

    def set_age(self, x):
        self.age = x


lee = User('lee')

# hasattr(obj,name)
hasattr(lee, 'age')  # True
hasattr(lee, 'tell')  # True
hasattr(lee, 'height')  # False

# getattr(obj,name)
getattr(lee,'age')  # 18
t = getattr(lee,'tell')
print(t())  # 请给我打钱

# setattr(obj, name, value)
print(lee.age)  # 18
setattr(lee, 'age', 19)
print(lee.age)  # 19

# delattr(obj, name)
delattr(lee, 'age')
# lee.age(10)  # AttributeError: age

 

反射当前模块

import sys

this_module = sys.modules[__name__]
print(hasattr(this_module, 'User'))  # True