Python 私有成员

class Parent(object):
    def __init__(self,name,protected,private):
        self.name = name
        self._protected = protected  # _var: 保护成员
        self.__private = private # __var: 私有成员, 在类的外部无法直接访问
        
    def get_private(self):
        print('get private var from parent inner func: ', self.__private) # meth_1
        # print('get private var from inner func: ', self._Parent__private) # meth_2 
    def get_protect(self):
        print('get protect var from parent inner func: ', self._protected)
        
    def __private_func(self):
        print('this is parent private func')

class Child(Parent):
    def get_private(self):
        print('get private var from child inner func: ', self.__private)
    def get_protect(self):
        print('get protect var from child inner func: ', self._protected)
    def get_private_func(self):
        # self.__private_func() # AttributeError
        self._Parent__private_func()
        
parent = Parent(1,2,3)
print(dir(parent))
print(parent.name)
print(parent._protected)
print(parent._Parent__private)
parent.get_protect()
parent.get_private()
# parent.__private_func() # AttributeError
parent._Parent__private_func()


child = Child(4,5,6)
print(dir(child))
print(child.name)
print(child._protected)
print(child._Parent__private)
child.get_protect()
# child.get_private() # AttributeError
child.get_private_func()

['_Parent__private', '_Parent__private_func', '__class__', '__delattr__', '__dict__', '__dir__', '__doc__', '__eq__', '__format__', '__ge__', '__getattribute__', '__gt__', '__hash__', '__init__', '__init_subclass__', '__le__', '__lt__', '__module__', '__ne__', '__new__', '__reduce__', '__reduce_ex__', '__repr__', '__setattr__', '__sizeof__', '__str__', '__subclasshook__', '__weakref__', '_protected', 'get_private', 'get_protect', 'name']
1
2
3
get protect var from parent inner func:  2
get private var from parent inner func:  3
this is parent private func
['_Parent__private', '_Parent__private_func', '__class__', '__delattr__', '__dict__', '__dir__', '__doc__', '__eq__', '__format__', '__ge__', '__getattribute__', '__gt__', '__hash__', '__init__', '__init_subclass__', '__le__', '__lt__', '__module__', '__ne__', '__new__', '__reduce__', '__reduce_ex__', '__repr__', '__setattr__', '__sizeof__', '__str__', '__subclasshook__', '__weakref__', '_protected', 'get_private', 'get_private_func', 'get_protect', 'name']
4
5
6
get protect var from child inner func:  5
this is parent private func