두근두근파이썬 10장 2번

from tkinter import *
 
total = 0
 
window = Tk()
label = Label(window, text = "현재 합계:" + str(total))
label.grid(row = 0, column = 0, columnspan = 3)
entry = Entry(window)
entry.grid(row = 1, column = 0, columnspan = 3)
 
def plus():
    global total
    total = total + float(entry.get())
    label = Label(window, text = "현재 합계:" + str(total))
    label.grid(row = 0, column = 0, columnspan = 3)
 
def minus():
    global total
    total = total - float(entry.get())
    label = Label(window, text = "현재 합계:" + str(total))
    label.grid(row = 0, column = 0, columnspan = 3)
 
def reset():
    global total
    total = 0
    label = Label(window, text = "현재 합계:" + str(total))
    label.grid(row = 0, column = 0, columnspan = 3)
 
 
 
b1 = Button(window, text = "더하기(+)", command = plus).grid(row=2, column = 0)
b2 = Button(window, text = "빼기(-)", command = minus).grid(row=2, column = 1)
b3 = Button(window, text = "초기화", command = reset).grid(row=2, column = 2)