from tkinter import *

reset=True

def buttonCallBack(event):

global label

global reset

num=event.widget['text']

if num=='C':

label['text']="0"

return

if num in "=":

label['text']=str(eval(label['text']))

reset=True

return

s=label['text']

if s=='0' or reset==True:

s=""

reset=False

label['text']=s+num #主窗口

root=Tk() root.wm_title(" 计算器 ") #显示栏 1 label=Label(root,text="0",background="white",anchor="e")

label['width']=35

label['height']=2

label.grid(row=1,columnspan=4,sticky=W) #按钮

showText="789/456*123-0.C+"

for i in range(4):

for j in range(4):

b=Button(root,text=showText[i*4+j],width=7)

b.grid(row=i+2,column=j)

b.bind("",buttonCallBack) showText="()"

for i in range(2):www.jb51.net

b=Button(root,text=showText[i],width=7)

b.grid(row=6,column=2+i)

b.bind("",buttonCallBack) b=Button(root,text="=")

b.grid(row=6,columnspan=2,sticky="we")

b.bind("",buttonCallBack)

root.mainloop()