Python Tkinter实现简易计算器功能

闲暇时间用tkinter写了个简易计算器，可实现简单的加减乘除运算，用了Button和Entry2个控件，下面是代码，只是简单的用了偏函数partial，因为那么多button的大部分参数都是一样的，使用偏函数可以简化参数传递，避免同样的参数传递写N次。

# -*- 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()

下面是运行结果：

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