在Python中生成私有变量

Question

我只是在学习如何上课，我试图完成我的一个作业，但我有困难，使一个变数私人化。我正在制作一个Account类，它存储ID、余额和年利率。所有这些都有默认值或可以设置。我的代码是这样的

class Account:
def __init__(self, ID=0, balance=100, annualInterestRate=0.0):
    self.ID = int(ID)
    self.balance = float(balance)
    self.annualInterestRate = float(annualInterestRate)
account = Account()
print(account.ID)
print(account.balance)
print(account.annualInterestRate)   

一切正常，但是如果我尝试将变量设为私有（在变量前面加上“uuu”），然后尝试访问这些值，就会得到AttributeError。有人知道我做错了什么吗？在

^{pr2}$

Answer 1

>>> class Foo:
...     def __init__(self, value):
...         self.__value = value
...
>>> foo = Foo(42)
>>> print(foo.value)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
AttributeError: 'Foo' object has no attribute 'value'

You changed their name, why do you expect the old name to keep working? – RemcoGerlich

我想你是说：

^{pr2}$

但它并不起作用：

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
AttributeError: 'Foo' object has no attribute '__value'

最后：

>>> print(foo._Foo__value)
42

Its due to name mangling. – Marcin