# class Foo:
# __N=1
# def __init__(self,x,y):
# self.x=x
# self.__y=y
#
# def __f1(self):
# print('f1')
#
# def f2(self):
# print(self.__N,self.__y)
# print(Foo.__N)
# print(Foo.__f1)
'''
AttributeError: type object 'Foo' has no attribute '__N'
AttributeError: type object 'Foo' has no attribute '__f1'
'''
# print(Foo.__dict__)
'''
{'__module__': '__main__', '_Foo__N': 1,
'__init__': <function Foo.__init__ at 0x000001C15BE34D38>,
'_Foo__f1': <function Foo.__f1 at 0x000001C15BE34DC8>,
'__dict__': <attribute '__dict__' of 'Foo' objects>,
'__weakref__': <attribute '__weakref__' of 'Foo' objects>, '__doc__': None}
'''
# print(Foo._Foo__N)
# print(Foo._Foo__f1)
'''
1
<function Foo.__f1 at 0x00000292065D4DC8>
'''
# obj=Foo(1,2)
# print(obj.__dict__)
# print(obj._Foo__y)
'''
{'x': 1, '_Foo__y': 2}
2
'''
# Foo.__M=2
# print(Foo.__M)
# print(Foo.__dict__)
'''
2
{'__module__': '__main__', '_Foo__N': 1,
'__init__': <function Foo.__init__ at 0x0000020E43E54D38>,
'_Foo__f1': <function Foo.__f1 at 0x0000020E43E54DC8>,
'__dict__': <attribute '__dict__' of 'Foo' objects>,
'__weakref__': <attribute '__weakref__' of 'Foo' objects>,
'__doc__': None, '__M': 2}
'''
'''
__开头的属性只是一种语法意义上的变形，并不会真的限制外部的访问
这种变形只在类定义阶段才会发生一次，类定义之后再新增的__开头的属性不会变形
这种隐藏只对外不对内，因为类内部定义的属性在类定义阶段统一发生变形
'''
# obj=Foo(1,2)
# print(obj.__dict__)
# obj.__z=3
# print(obj.__dict__)
# print(obj.__z)
'''
{'x': 1, '_Foo__y': 2}
{'x': 1, '_Foo__y': 2, '__z': 3}
3
'''
# obj=Foo(2,2)
# obj.f2()
'''
1 2
'''
# print(obj.__N)
'''
AttributeError: 'Foo' object has no attribute '__N'
'''
# class Foo:
# def f1(self):
# print('Foo f1')
# class Bar(Foo):
# def f1(self):
# print('Bar.f1')
#
# b=Bar()
# b.f1()
'''
Bar.f1
'''
'''
class Foo:
def __f1(self): # _Foo__f1
print('Foo f1')
class Bar(Foo):
def __f1(self): # _Bar__f1
print('Bar.f1')
'''
# class Foo:
# def f1(self):
# print('Foo f1')
#
# def f2(self):
# print('Foo.f2')
# self.f1()
#
# class Bar(Foo):
# def f1(self):
# print('Bar.f1')
#
# b=Bar()
# b.f2()
'''
Foo.f2
Bar.f1
'''
# class Foo:
# def __f1(self):
# print('Foo f1')
#
# def f2(self):
# print('Foo.f2')
# self.__f1()
#
# class Bar(Foo):
# def __f1(self):
# print('Bar.f1')
#
# b=Bar()
# b.f2()
'''
Foo.f2
Foo f1
'''
# class People:
# def __init__(self,name,age):
# self.__name=name
# self.__age=age
# def tell_info(self):
# print('姓名:<%s>年龄:<%s>'%(self.__name,self.__age))
# p=People('rambo',18)
# p.tell_info()
'''
姓名:<rambo>年龄:<18>
'''
# class People:
# def __init__(self,name,age):
# self.set_info(name,age)
# def tell_info(self):
# print('姓名:<%s>年龄:<%s>'%(self.__name,self.__age))
# def set_info(self,name,age):
# self.__name=name
# self.__age=age
#
# p=People('rambo',18)
# p.set_info('Rambo',20)
# p.tell_info()
'''
姓名:<Rambo>年龄:<20>
'''
# class People:
# def __init__(self,name,age):
# self.set_info(name,age)
# def tell_info(self):
# print('姓名:<%s>年龄:<%s>'%(self.__name,self.__age))
# def set_info(self,name,age):
# if type(name)is not str:
# raise TypeError('name must be str')
# if type(age)is not int:
# raise TypeError('age must be int')
# self.__name=name
# self.__age=age
#
# p=People(1,18)
# p.tell_info()
'''
TypeError: name must be str
'''
# class ATM:
# def __card(self):
# print('插卡')
# def __auth(self):
# print('用户认证')
# def __input(self):
# print('输入取款金额')
# def __print_bill(self):
# print('打印账单')
# def __take_money(self):
# print('取款')
# def withdraw(self):
# self.__card()
# self.__auth()
# self.__input()
# self.__print_bill()
# self.__take_money()
# property
# class People:
# def __init__(self,name,age,height,weight):
# self.name=name
# self.age=age
# self.height=height
# self.weight=weight
#
# def bmi(self):
# return self.weight / (self.height ** 2)
#
# rambo=People('rambo',18,1.75,65)
# print(rambo.bmi())
'''
21.224489795918366
'''
# class People:
# def __init__(self,name,age,height,weight):
# self.name=name
# self.age=age
# self.height=height
# self.weight=weight
# @property
# def bmi(self):
# return self.weight / (self.height ** 2)
# rambo=People('rambo',18,1.75,65)
# print(rambo.bmi)
'''
21.224489795918366
'''
# rambo=People('rambo',18,1.75,65)
# rambo.height=1.80
# print(rambo.bmi)
'''
20.061728395061728
'''
# class People:
# def __init__(self,name):
# self.__name=name
#
# def get_name(self):
# return self.__name
#
# rambo=People('rambo')
# print(rambo.get_name())
'''
rambo
'''
# class People:
# def __init__(self,name):
# self.__name=name
# @property
# def get_name(self):
# return self.__name
#
# rambo=People('rambo')
# print(rambo.get_name)
'''
rambo
'''
# class People:
# def __init__(self,name):
# self.__name=name
# @property
# def name(self):
# return self.__name
#
# rambo=People('rambo')
# print(rambo.name)
'''
rambo
'''
# class People:
# def __init__(self,name):
# self.__name=name
# @property
# def name(self):
# return self.__name
# @name.setter
# def name(self,obj):
# self.__name=obj
# rambo=People('rambo')
# rambo.name='Rambo'
# print(rambo.name)
'''
Rambo
'''
# class People:
# def __init__(self,name):
# self.__name=name
# @property
# def name(self):
# return self.__name
# @name.setter
# def name(self,obj):
# if type(obj)is not str:
# raise TypeError('name must be str')
# self.__name=obj
# @name.deleter
# def name(self):
# del self.__name
# rambo=People('rambo')
# del rambo.name
# print(rambo.name)
'''
AttributeError: 'People' object has no attribute '_People__name'
'''
# class People:
# def __init__(self,name):
# self.__name=name
# @property
# def name(self):
# return self.__name
# @name.setter
# def name(self,obj):
# if type(obj)is not str:
# raise TypeError('name must be str')
# self.__name=obj
# @name.deleter
# def name(self):
# raise TypeError('不让删')
# rambo=People('rambo')
# del rambo.name
# print(rambo.name)
'''
TypeError: 不让删
'''