计算器(python Tk编写)

from __future__ import division   
from Tkinter import Tk, Entry, Button, Label, mainloop  
from tkFont import Font  


def pp(ev=None):  
    foodl = ''  
    try: foodl = eval( text.get())  
    except : pass  
    if isinstance(foodl, (int,float,long)): pass  
    else: foodl = 'Error..'  
    label.config(text=foodl)  


#主窗口  
top = Tk()  
top.title('compute')  

ft = Font(family = ('Verdana'), size = 8 ) #字体  
#注册组件  
text = Entry(top, font= ft)  
button = Button(top, text='计算(注意先后运算)', command=pp)  
label = Label(text='运算符: + - * / % **', font=ft)  


Enter = lambda x: x.keycode == 13 and pp()  

Key = lambda x: label.config(text='运算符: + - * / % **')  

text.bind('', Enter)#回车事件  
text.focus()  #获得焦点  

#  

text.bind('', Key)  
text.pack()  
button.pack()   
label.pack()  
mainloop()