Python Tkinter实现简易计算器功能

# -*- coding: utf-8 -*- #author: Cullen  #import the module from Tkinter import * import tkFont import os from functools import partial from PIL import Image, ImageTk  def get_input(entry, argu):   entry.insert(END, argu)  def backspace(entry):   input_len = len(entry.get())   entry.delete(input_len - 1)  def clear(entry):   entry.delete(0, END)  def calc(entry):   input = entry.get()   output = str(eval(input.strip()))   clear(entry)   entry.insert(END, output)  def cal():   root = Tk()   root.title("Calc")   root.resizable(0,0)    entry_font = tkFont.Font(size=12)   entry = Entry(root, justify="right", font=entry_font)   entry.grid(row=0, column=0, columnspan=4, sticky=N+W+S+E, padx=5, pady=5)    button_font = tkFont.Font(size=10, weight=tkFont.BOLD)   button_bg = '#D5E0EE'   button_active_bg = '#E5E35B'    myButton = partial(Button, root, bg=button_bg, padx=10, pady=3, activebackground = button_active_bg)    button7 = myButton(text='7', command=lambda : get_input(entry, '7'))   button7.grid(row=1, column=0, pady=5)    button8 = myButton(text='8', command=lambda : get_input(entry, '8'))   button8.grid(row=1, column=1, pady=5)    button9 = myButton(text='9', command=lambda : get_input(entry, '9'))   button9.grid(row=1, column=2, pady=5)    button10 = myButton(text='+', command=lambda : get_input(entry, '+'))   button10.grid(row=1, column=3, pady=5)    button4 = myButton(text='4', command=lambda : get_input(entry, '4'))   button4.grid(row=2, column=0, pady=5)    button5 = myButton(text='5', command=lambda : get_input(entry, '5'))   button5.grid(row=2, column=1, pady=5)    button6 = myButton(text='6', command=lambda : get_input(entry, '6'))   button6.grid(row=2, column=2, pady=5)    button11 = myButton(text='-', command=lambda : get_input(entry, '-'))   button11.grid(row=2, column=3, pady=5)    button1 = myButton(text='1', command=lambda : get_input(entry, '1'))   button1.grid(row=3, column=0, pady=5)    button2 = myButton(text='2', command=lambda : get_input(entry, '2'))   button2.grid(row=3, column=1, pady=5)    button3 = myButton(text='3', command=lambda : get_input(entry, '3'))   button3.grid(row=3, column=2, pady=5)    button12 = myButton(text='*', command=lambda : get_input(entry, '*'))   button12.grid(row=3, column=3, pady=5)    button0 = myButton(text='0', command=lambda : get_input(entry, '0'))   button0.grid(row=4, column=0, columnspan=2, padx=3, pady=5, sticky=N+S+E+W)    button13 = myButton(text='.', command=lambda : get_input(entry, '.'))   button13.grid(row=4, column=2, pady=5)    button14 = Button(root, text='/', bg=button_bg, padx=10, pady=3,            command=lambda : get_input(entry, '/'))   button14.grid(row=4, column=3, pady=5)    button15 = Button(root, text='<-', bg=button_bg, padx=10, pady=3,            command=lambda : backspace(entry), activebackground = button_active_bg)   button15.grid(row=5, column=0, pady=5)    button16 = Button(root, text='C', bg=button_bg, padx=10, pady=3,            command=lambda : clear(entry), activebackground = button_active_bg)   button16.grid(row=5, column=1, pady=5)    button17 = Button(root, text='=', bg=button_bg, padx=10, pady=3,            command=lambda : calc(entry), activebackground = button_active_bg)   button17.grid(row=5, column=2, columnspan=2, padx=3, pady=5, sticky=N+S+E+W)    root.mainloop()  if __name__ == '__main__':   cal()