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python - 我如何解决此名称未定义

问题描述

我想让我制作的程序可以运行我制作这样的代码

def cafe_food(self):
    friedrice_items = tk.Entry(F_FItems)
    friedrice_items.config(width=7, borderwidth=4, relief="sunken", font=("calibri", 10,"bold"),foreground="white", background="#248aa2")
    friedrice_items.place(x=81, y=1)

def Total_Biil(self):
    friedrice_price = 10
    pizza_price = 20

    if friedrice_items.get() != "":
        friedrice_cost = friedrice_price * int(friedrice_items.get())
    else:
        friedrice_cost = 0

    if pizza_items.get() != "":
        friedrice_cost = pizza_price * int(pizza_items.get())
    else:
        pizza_cost = 0

    total_bills = friedrice_cost + pizza_cost

如果我运行此代码并且..

Exception in Tkinter callback
Traceback (most recent call last):
  File "C:\Users\kisah tegar\AppData\Local\Programs\Python\Python39\lib\tkinter\__init__.py", line 1885, in __call__
    return self.func(*args)
  File "D:\Code\Python\Project\restaurant_mg\main.py", line 498, in Total_Bill
    if friedrice_items.get() != "":
NameError: name 'friedrice_items' is not defined
[Finished in 6.3s]

这是我的问题:(我怎样才能在那个函数中得到friedrice_items

标签： pythontkintergettkinter-entry

解决方案

如果这段代码在一个类中，self.请尝试在变量名之前添加：

def cafe_food(self):
    self.friedrice_items = tk.Entry(F_FItems)
    self.friedrice_items.config(width=7, borderwidth=4, relief="sunken", font=("calibri", 10,"bold"),foreground="white", background="#248aa2")
    self.friedrice_items.place(x=81, y=1)

def Total_Biil(self):
    self.friedrice_price = 10
    self.pizza_price = 20

    if self.friedrice_items.get() != "":
        self.friedrice_cost = self.friedrice_price * int(self.friedrice_items.get())
    else:
        self.friedrice_cost = 0

    if self.pizza_items.get() != "":
        self.friedrice_cost = self.pizza_price * int(self.pizza_items.get())
    else:
        self.pizza_cost = 0

    self.total_bills = self.friedrice_cost + self.pizza_cost

self或任何你命名的，是一个全局关键字，在一个类中，你可以在类中的任何地方访问变量。

如果您不使用self，您将无法在任何地方访问它，就像您之前发生的那样。

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