【发布时间】：2021-09-17 01:29:53
【问题描述】：
我正在尝试对我的计算器项目进行编程以执行操作。它可以执行加法，我想要它 执行剩下的四个（减号、乘法、除法、幂） 但是因为这个错误我被卡住了：
C:\Users\Admin\PycharmProjects\venv\Scripts\python.exe
"C:/Users/Admin/PycharmProjects/pythonProject/Calculator GUI v1.0.py"
Exception in Tkinter callback
Traceback (most recent call last):
File "C:\Users\Admin\Python3.9\lib\tkinter\__init__.py", line 1892, in __call__
return self.func(*args)
File "C:\Users\Admin\PycharmProjects\pythonProject\Calculator GUI v1.0.py", line 32, in
button_subtract
e.insert(0, f_num + int(second_number))
NameError: name 'f_num' is not defined
Process finished with exit code 0
我的代码：
import tkinter as Tk
from tkinter import *
root_var = Tk()
root_var.title("Calculator")
e = Entry(root_var, width=25, borderwidth=5)
e.grid(row=0, column=0, columnspan=3, padx=10, pady=10)
def button_click(number=None):
#e.delete(0, END)
current = e.get()
e.delete(0, END)
e.insert(0, str(current) + str(number) )
def button_clear():
e.delete(0, END)
def button_add():
first_number = e.get()
global f_num
f_num = int(first_number)
e.delete(0, END)
def button_subtract():
second_number = e.get()
e.delete(0, END)
e.insert(0, f_num + int(second_number))
def button_multiply():
third_number = e.get()
e.delete(0, END)
e.insert(0, f_num + int(third_number))
def button_divide():
fourth_number = e.get()
e.delete(0, END)
e.insert(0, f_num + int(fourth_number))
def button_exponents():
fifth_number = e.get()
e.delete(0, END)
e.insert(0, f_num + int(fifth_number))
def button_equal():
sixth_number = e.get()
e.delete(0, END)
e.insert(0, f_num + int(sixth_number))
button_1 = Button(root_var, text="1", padx=50, pady=10, command=lambda: button_click(1))
button_2 = Button(root_var, text="2", padx=50, pady=10, command=lambda: button_click(2))
button_3 = Button(root_var, text="3", padx=50, pady=10, command=lambda: button_click(3))
button_4 = Button(root_var, text="4", padx=50, pady=10, command=lambda: button_click(4))
button_5 = Button(root_var, text="5", padx=50, pady=10, command=lambda: button_click(5))
button_6 = Button(root_var, text="6", padx=50, pady=10, command=lambda: button_click(6))
button_7 = Button(root_var, text="7", padx=50, pady=10, command=lambda: button_click(7))
button_8 = Button(root_var, text="8", padx=50, pady=10, command=lambda: button_click(8))
button_9 = Button(root_var, text="9", padx=50, pady=10, command=lambda: button_click(9))
button_0 = Button(root_var, text="0", padx=50, pady=10, command=lambda: button_click(0))
button_addition = Button(root_var, text="+", padx=50, pady=10, command=button_add)
button_subtraction = Button(root_var, text="-", padx=50, pady=10, command=button_subtract)
button_multiplication = Button(root_var, text="*", padx=50, pady=10, command=button_multiply)
button_division = Button(root_var, text="/", padx=50, pady=10, command=button_divide)
button_exponents = Button(root_var, text="^", padx=50, pady=10, command=button_exponents)
button_equals = Button(root_var, text="=", padx=50, pady=10, command=button_equal)
button_clear = Button(root_var, text="C", padx=50, pady=10, command=button_clear)
button_1.grid(row=3, column=2)
button_2.grid(row=3, column=1)
button_3.grid(row=3, column=0)
button_4.grid(row=2, column=2)
button_5.grid(row=2, column=1)
button_6.grid(row=2, column=0)
button_7.grid(row=1, column=2)
button_8.grid(row=1, column=1)
button_9.grid(row=1, column=0)
button_0.grid(row=4, column=0)
button_addition.grid(row=4, column=1)
button_subtraction.grid(row=4, column=2)
button_multiplication.grid(row=5, column=0)
button_division.grid(row=5, column=1)
button_exponents.grid(row=5, column=2)
button_equals.grid(row=6, column=0)
button_clear.grid(row=6, column=1)
root_var.mainloop()
加法操作有效。我希望其他操作也能够执行各自的任务。
【问题讨论】：
-
您发布的代码没有正确缩进，因此没有意义。
-
您在函数
button_add()中定义变量f_num。所以它只有在你第一次调用这个函数时才被定义。也许尝试在其他地方定义f_num。 -
你在函数中本地引用
f_num。要么将其设为全局变量（不推荐），要么将其作为参数传递 -
@PCM 拥有一个全局变量并不是那么糟糕，而且没有办法将它作为参数传递。只有当您不记得它们的名称/它们所持有的内容时，拥有全局变量才是一个问题。
-
即使您可以修复
f_num问题，这些函数内部的乘法、除法、减法和指数运算的逻辑也不正确。
标签： python-3.x user-interface tkinter calculator nameerror