Python只用40行代码编写的计算器实例

from tkinter import *reset=Truedef 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1label=Label(root,text="0",background="white",anchor="e")label['width']=35label['height']=2label.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("<button-1>",buttonCallBack)showText="()"for i in range(2):www.vevb.com  b=Button(root,text=showText[i],width=7)  b.grid(row=6,column=2+i)  b.bind("<button-1>",buttonCallBack)b=Button(root,text="=")b.grid(row=6,columnspan=2,sticky="we")b.bind("<button-1>",buttonCallBack)root.mainloop()</button-1></button-1></button-1>