访问类中方法中的变量 [英] Accessing a variable inside the method of a class

问题描述

我正在使用Tkinter / Python创建一个预算程序。这是我的代码的基础：

I'm creating a budgeting program using Tkinter/Python. This is the basics of my code:

class Expense:
  def __init__(self):
    def Save(self)
       TotalAmount = blah

所以我需要访问 TotalAmount 以外的类，但我不知道我该怎么走这个。

So I need to access TotalAmount outside of the class but I'm not sure how I would go about this.

推荐答案

您可以在 __ init __（）方法中创建一个变量，只要初始化一个类，就可以调用该变量，然后可以更改变量的值

You could simply create a variable inside the __init__() method which gets called as soon as a class is initialized, and then you can change the value of the variable which would get reflected outside the class as well.

似乎你试图创建一个方法 save（）类，所以我做了同样的，如果你不想让你的 save（）方法接受任何参数，那么你也可以使用 def save （self）：

It seems that you were trying to create a method save() for the class so I did the same for you, If you don't want your save() method to take any arguments then you can also use def save(self):

class Expense:
    def __init__(self):
        #Do some initializations here
        self.TotalAmount = 0
    def save(self, amount):
        self.TotalAmount = amount


exp = Expense()
print exp.TotalAmount
>>> 0
exp.save(10)
print exp.TotalAmount
>>> 10

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