我如何解决此名称未定义

Question

我想让我做的程序可以运行我编写这样的代码

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

如果我运行此代码和..

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

Answer 1

如果这段代码在 class 中，请尝试在变量名称前添加 self.：

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 或任何你给它起的名字，是一个 global keyword，在 class 中，你可以访问 class.[=15 中的任何地方的变量=]

如果您不使用 self，您将无法在任何地方访问它，就像您之前遇到的情况一样。

我如何解决此名称未定义

How I can solved this name is not defined

python

get

tkinter

tkinter-entry