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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