简易计算器界面制作python

# coding=utf-8
from Tkinter import *

def frame(root,side): #创建条形框架
    w = Frame(root)
    w.pack(side=side, expand=YES,fill=BOTH)
    return w

def button(root,side,text,command=None):#创建按钮
    w= Button(root,text=text, command=command)
    w.pack(side=side, expand=YES, fill=BOTH)
    return w

class Calculator(Frame):

    def __init__(self):
        Frame.__init__(self)
        self.pack(expand=YES, fill=BOTH)
        self.master.title('计算器')  #表示顶层
        display = StringVar()
        Entry(self,textvariable=display).pack(side=TOP,expand=YES, fill=BOTH)

        for key in ('123','456','789','-0.'):
            keyf = frame(self, TOP)
            for char in key:
                button(keyf,LEFT,char,lambda w=display,c=char:w.set(w.get()+c))

        opsf = frame(self, TOP)
        for char in '+*/=':
            if char == '=':
                btn=button(opsf,LEFT,char)
                btn.bind('',lambda w=display,s=self:s.calc(w))
            else:
                btn=button(opsf, LEFT, char, lambda w=display, c=char:w.set(w.get()+c))

        clearf = frame(self, BOTTOM)
        button(clearf,LEFT,'c',lambda w=display:w.set(''))

    def calc(self, display):
        try:
            display.set(eval(display.get()))
        except:
            print 1

if __name__ == '__main__':
    Calculator().mainloop()