python 面向对象 私有属性

Posted 2020-11-06 minger_lcm

 

 

__init__构造函数

self.name = name  # 属性， 实例变量，成员变量，字段

def sayhi()# 方法， 动态属性

私有属性不对外看到  前面加上__

class role(): # 传参数

    def __init__(self,name,role,weapon,life_value=100,moneny=15000):
        # 构造函数
        # 实例化过程中做一些类的初始化工作
        self.name = name
        self.role = role
        self.weapon = weapon
        self.life_value = life_value
        self.moneny = moneny
        self.__heart = ‘normal‘   # 私有属性

    def shot(self):  # 类的方法，功能（动态属性）
        print("shotting")

    def got_shot(self):
        print("on,%s got shoot..." % self.name)

    def buy_gun(self,gun_name):
        print("%s just bought %s" %(self.name,gun_name))
        self.weapon = gun_name

b1 = role(‘mike‘,‘police‘,‘AK47‘)

print(b1.name)
print(b1.__heart)

# 私有属性不对外公开
‘‘‘
mike
Traceback (most recent call last):
  File "C:/Users/Administrator/PycharmProjects/ss/SSS/day6/私有属性1.py", line 32, in <module>
    print(b1.__heart)
AttributeError: ‘role‘ object has no attribute ‘__heart‘
‘‘‘

 

在内部方法使用

class role(): # 传参数

    def __init__(self,name,role,weapon,life_value=100,moneny=15000):
        # 构造函数
        # 实例化过程中做一些类的初始化工作
        self.name = name
        self.role = role
        self.weapon = weapon
        self.life_value = life_value
        self.moneny = moneny
        self.__heart = ‘normal‘   # 私有属性

    def shot(self):  # 类的方法，功能（动态属性）
        print("shotting")
        print("私有属性", self.__heart)
        self.__heart = ‘dddd‘

        print("私有属性", self.__heart)

    def got_shot(self):
        print("on,%s got shoot..." % self.name)

    def buy_gun(self,gun_name):
        print("%s just bought %s" %(self.name,gun_name))
        self.weapon = gun_name

b1 = role(‘mike‘,‘police‘,‘AK47‘)

print(b1.shot())


‘‘‘
shotting
私有属性 normal
私有属性 dddd
None
‘‘‘

如果想强制对外能访问

class role(): # 传参数

    def __init__(self,name,role,weapon,life_value=100,moneny=15000):
        # 构造函数
        # 实例化过程中做一些类的初始化工作
        self.name = name
        self.role = role
        self.weapon = weapon
        self.life_value = life_value
        self.moneny = moneny
        self.__heart = ‘normal‘   # 私有属性

    def shot(self):  # 类的方法，功能（动态属性）
        print("shotting")
        print("私有属性", self.__heart)
        self.__heart = ‘dddd‘

        print("私有属性", self.__heart)

    # 定义一个方法用来对外访问
    def show_heart(self):
        return self.__heart

    def got_shot(self):
        print("on,%s got shoot..." % self.name)

    def buy_gun(self,gun_name):
        print("%s just bought %s" %(self.name,gun_name))
        self.weapon = gun_name

b1 = role(‘mike‘,‘police‘,‘AK47‘)

print(b1.show_heart())

# normal

 

强制访问私有属性

class role(): # 传参数

    def __init__(self,name,role,weapon,life_value=100,moneny=15000):
        # 构造函数
        # 实例化过程中做一些类的初始化工作
        self.name = name
        self.role = role
        self.weapon = weapon
        self.life_value = life_value
        self.moneny = moneny
        self.__heart = ‘normal‘   # 私有属性

    def shot(self):  # 类的方法，功能（动态属性）
        print("shotting")

    def got_shot(self):
        print("on,%s got shoot..." % self.name)

    def buy_gun(self,gun_name):
        print("%s just bought %s" %(self.name,gun_name))
        self.weapon = gun_name

b1 = role(‘mike‘,‘police‘,‘AK47‘)

# 强制访问私有属性
print(b1._role__heart)

b1._role__heart

# normal

 

 私有属性 继承重构方法不能访问 父类的私有属性

class Foo(object):


    def __init__(self, name):
        self.__name = name

    def f1(self):
        print(self.__name)

class Bar(Foo):

    def f2(self):
        print(self.__name)

obj = Bar("mike")
obj.f2()

‘‘‘
Traceback (most recent call last):
  File "C:/Users/Administrator.QH-20170325TNQR/PycharmProjects/SSSSS/SS/day7/S13 面向对象/私有属性 继承1.py", line 21, in <module>
    obj.f2()
  File "C:/Users/Administrator.QH-20170325TNQR/PycharmProjects/SSSSS/SS/day7/S13 面向对象/私有属性 继承1.py", line 18, in f2
    print(self.__name)
AttributeErr

 

只有父类自己才能访问

class Foo(object):


    def __init__(self, name):
        self.__name = name

    def f1(self):
        print(self.__name)

class Bar(Foo):

    def f2(self):
        print(self.__name)

obj = Bar("mike")
obj.f1()

# mike