Python写计算器

    # -*- coding: utf-8 -*-  
    #author: Cullen  
    #import the module  
      
    from Tkinter import *  
    from functools import partial  
    import tkFont  
      
    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()  

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