python嵌套类
python嵌套类
提问于 2013-01-30 22:37:47
首先，这是我的测试代码，我使用的是python 3.2.x：
class account:
def __init__(self):
pass
class bank:
def __init__(self):
self.balance = 100000
def balance(self):
self.balance
def whitdraw(self, amount):
self.balance -= amount
def deposit(self, amount):
self.balance += amount当我这样做的时候：
a = account()
a.bank.balance我期望得到balance的返回值，但是我得到了"balance“函数，为什么会这样？当我这样做时，它返回balance的值：
class bank:
def __init__(self):
self.balance = 100000
def balance(self):
self.balance
def whitdraw(self, amount):
self.balance -= amount
def deposit(self, amount):
self.balance += amount
a = bank()
a.balance所以我想知道这是为什么，如果有人能想出一种方法，在嵌套版本中给我平衡的值，那就太好了。
回答 1
Stack Overflow用户
回答已采纳
发布于 2013-01-30 23:06:48
我的代码版本，带有注释：
#
# 1. CamelCasing for classes
#
class Account:
def __init__(self):
# 2. to refer to the inner class, you must use self.Bank
# 3. no need to use an inner class here
self.bank = self.Bank()
class Bank:
def __init__(self):
self.balance = 100000
# 4. in your original code, you had a method with the same name as
# the attribute you set in the constructor. That meant that the
# method was replaced with a value every time the constructor was
# called. No need for a method to do a simple attribute lookup. This
# is Python, not Java.
def withdraw(self, amount):
self.balance -= amount
def deposit(self, amount):
self.balance += amount
a = Account()
print(a.bank.balance)页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/14606559
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