python gui

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代码： import tkinter from functools import partial　　def get_input(entry, argu):     input_data = entry.get()

 

    if (input_data[-1:] == '+') and (argu == '+'):         return     if (input_data[-2:] == '+-') and (argu == '-'):         return     if (input_data[-2:] == '--') and (argu in ['-', '+']):         return     if (input_data[-2:] == '**') and (argu in ['*', '/']):         return

 

    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_data = entry.get()     if not input_data:         return

 

    clear(entry)

 

    try:         output_data = str(eval(input_data))     except Exception:         entry.insert("end", "Calculation error")     else:         if len(output_data) > 20:             entry.insert("end", "Value overflow")         else:             entry.insert("end", output_data)

if __name__ == '__main__':

 

    root = tkinter.Tk()     root.title("Calculator")

 

    root.resizable(0, 0)

 

    button_bg = 'orange'     math_sign_bg = 'DarkTurquoise'     cal_output_bg = 'YellowGreen'     button_active_bg = 'gray'

 

    entry = tkinter.Entry(root, justify="right", font=1)     entry.grid(row=0, column=0, columnspan=4, padx=10, pady=10)

 

    def place_button(text, func, func_params, bg=button_bg, **place_params):         my_button = partial(tkinter.Button, root, bg=button_bg, padx=10, pady=3, activebackground=button_active_bg)         button = my_button(text=text, bg=bg, command=lambda: func(*func_params))         button.grid(**place_params)

 

    place_button('7', get_input, (entry, '7'), row=1, column=0, ipadx=5, pady=5)     place_button('8', get_input, (entry, '8'), row=1, column=1, ipadx=5, pady=5)     place_button('9', get_input, (entry, '9'), row=1, column=2, ipadx=5, pady=5)     place_button('4', get_input, (entry, '4'), row=2, column=0, ipadx=5, pady=5)     place_button('5', get_input, (entry, '5'), row=2, column=1, ipadx=5, pady=5)     place_button('6', get_input, (entry, '6'), row=2, column=2, ipadx=5, pady=5)     place_button('1', get_input, (entry, '1'), row=3, column=0, ipadx=5, pady=5)     place_button('2', get_input, (entry, '2'), row=3, column=1, ipadx=5, pady=5)     place_button('3', get_input, (entry, '3'), row=3, column=2, ipadx=5, pady=5)     place_button('0', get_input, (entry, '0'), row=4, column=0, padx=8, pady=5,                  columnspan=2, sticky=tkinter.E + tkinter.W + tkinter.N + tkinter.S)     place_button('.', get_input, (entry, '.'), row=4, column=2, ipadx=7, padx=5, pady=5)

 

    place_button('+', get_input, (entry, '+'), bg=math_sign_bg, row=1, column=3, ipadx=5, pady=5)     place_button('-', get_input, (entry, '-'), bg=math_sign_bg, row=2, column=3, ipadx=5, pady=5)     place_button('*', get_input, (entry, '*'), bg=math_sign_bg, row=3, column=3, ipadx=5, pady=5)     place_button('/', get_input, (entry, '/'), bg=math_sign_bg, row=4, column=3, ipadx=5, pady=5)

 

    place_button('<-', backspace, (entry,), row=5, column=0, ipadx=5, padx=5, pady=5)     place_button('C', clear, (entry,), row=5, column=1, pady=5, ipadx=5)     place_button('=', calc, (entry,), bg=cal_output_bg, row=5, column=2, ipadx=5, padx=5, pady=5,                  columnspan=2, sticky=tkinter.E + tkinter.W + tkinter.N + tkinter.S)

 

    root.mainloop() 运行截图

 

 

 

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