import decimal

import math

from tkinter import Tk, StringVar, Button, Label, Menu, messagebox

top = Tk()

top.title('计算器')

top.resizable(0, 0)

global cun_cu, var_text, result, fu_hao

result, fu_hao = None, None

var_text = StringVar()

cun_cu = []

class AnJianZhi(object):

global cun_cu, var_text, result, fu_hao

def __init__(self, an_jian):

self.an_jian = an_jian

def jia(self):

cun_cu.append(self.an_jian)

var_text.set(''.join(cun_cu))

def tui(self):

if cun_cu is not None and cun_cu.__len__() > 0:

cun_cu.pop()

var_text.set(''.join(cun_cu))

def clear(self):

cun_cu.clear()

var_text.set('')

result = None

fu_hao = None

def zheng_fu(self):

if cun_cu is None or cun_cu.__len__() == 0:

var_text.set(''.join(cun_cu))

return

if cun_cu[0]:

if cun_cu[0] == '-':

cun_cu[0] = '+'

elif cun_cu[0] == '+':

cun_cu[0] = '-'

else:

cun_cu.insert(0, '-')

var_text.set(''.join(cun_cu))

def xiao_shu_dian(self):

if cun_cu.count('.') >= 1:

pass

else:

if cun_cu.__len__() == 0:

cun_cu.append('0')

cun_cu.append('.')

var_text.set(''.join(cun_cu))

def yun_suan(self):

global cun_cu, var_text, result, fu_hao

if var_text.get() == '':

pass

else:

get1 = decimal.Decimal(var_text.get())

if self.an_jian in ('1/x', 'sqrt'):

if self.an_jian == '1/x':

try:

result = 1/get1

except ZeroDivisionError as ex:

result = 0

messagebox.showinfo('异常', '被除数等于:{}'.format(get1))

elif self.an_jian == 'sqrt':

result = math.sqrt(get1)

elif self.an_jian in ('+', '-', '*', '/', '=', '%'):

if fu_hao is not None:

get1 = decimal.Decimal(result)

get2 = decimal.Decimal(var_text.get())

if fu_hao == '+':

result = get1 + get2

elif fu_hao == '-':

result = get1 - get2

elif fu_hao == '*':

result = get1 * get2

elif fu_hao == '/':

try:

result = get1 / get2

except ZeroDivisionError:

result = 0

messagebox.showerror('异常', '被除数等于:{}'.format(get2))

except Exception as et:

result = 0

messagebox.showerror('异常', '异常信息:{}'.format(et))

elif fu_hao == '%':

result = get1 % get2

else:

result = get1

if self.an_jian == '=':

fu_hao = None

else:

fu_hao = self.an_jian

print(fu_hao)

print(result)

var_text.set(str(result))

cun_cu.clear()

def bu_ju(top_var):

global cun_cu, var_text, result, fu_hao

entry1 = Label(top_var, width=30, height=2, bg='white', anchor='se', textvariable=var_text)

entry1.grid(row=0, columnspan=5)

button_mc = Button(top_var, text='MC', width=5)

button_mr = Button(top_var, text='MR', width=5)

button_ms = Button(top_var, text='MS', width=5)

button_m1 = Button(top_var, text='M+', width=5)

button_m2 = Button(top_var, text='M-', width=5)

button_mc.grid(row=1,column=0)

button_mr.grid(row=1,column=1)

button_ms.grid(row=1,column=2)

button_m1.grid(row=1,column=3)

button_m2.grid(row=1,column=4)

button_j = Button(top_var, text='←', width=5, command=AnJianZhi('c').tui)

button_ce = Button(top_var, text='CE', width=5)

button_c = Button(top_var, text=' C ', width=5, command=AnJianZhi('c').clear)

button12 = Button(top_var, text='±', width=5, command=AnJianZhi('c').zheng_fu)

button_d = Button(top_var, text='√', width=5, command=AnJianZhi('sqrt').yun_suan)

button_j.grid(row=2,column=0)

button_ce.grid(row=2,column=1)

button_c.grid(row=2,column=2)

button12.grid(row=2,column=3)

button_d.grid(row=2,column=4)

button7 = Button(top_var, text=' 7 ', width=5, command=AnJianZhi('7').jia)

button8 = Button(top_var, text=' 8 ', width=5, command=AnJianZhi('8').jia)

button9 = Button(top_var, text=' 9 ', width=5, command=AnJianZhi('9').jia)

button_c = Button(top_var, text=' / ', width=5, command=AnJianZhi('/').yun_suan)

button_f = Button(top_var, text=' % ', width=5, command=AnJianZhi('%').yun_suan)

button7.grid(row=3,column=0)

button8.grid(row=3,column=1)

button9.grid(row=3,column=2)

button_c.grid(row=3,column=3)

button_f.grid(row=3,column=4)

button4 = Button(top_var, text=' 4 ', width=5, command=AnJianZhi('4').jia)

button5 = Button(top_var, text=' 5 ', width=5, command=AnJianZhi('5').jia)

button6 = Button(top_var, text=' 6 ', width=5, command=AnJianZhi('6').jia)

button_x = Button(top_var, text=' * ', width=5, command=AnJianZhi('*').yun_suan)

button_fs = Button(top_var, text='1/x', width=5, command=AnJianZhi('1/x').yun_suan)

button4.grid(row=4,column=0)

button5.grid(row=4,column=1)

button6.grid(row=4,column=2)

button_x.grid(row=4,column=3)

button_fs.grid(row=4,column=4)

button1 = Button(top_var, text=' 1 ', width=5, command=AnJianZhi('1').jia)

button2 = Button(top_var, text=' 2 ', width=5, command=AnJianZhi('2').jia)

button3 = Button(top_var, text=' 3 ', width=5, command=AnJianZhi('3').jia)

button_ = Button(top_var, text=' - ', width=5, command=AnJianZhi('-').yun_suan)

button_dy = Button(top_var, text=' \n = \n ', width=5, command=AnJianZhi('=').yun_suan)

button1.grid(row=5, column=0)

button2.grid(row=5, column=1)

button3.grid(row=5, column=2)

button_.grid(row=5, column=3)

button_dy.grid(row=5, column=4,rowspan=2)

button0 = Button(top_var, text=' 0 ', width=11, command=AnJianZhi('0').jia)

button_jh = Button(top_var, text=' . ', width=5, command=AnJianZhi('c').xiao_shu_dian)

button_jia = Button(top_var, text=' + ', width=5, command=AnJianZhi('+').yun_suan)

button0.grid(row=6,column=0,columnspan=2)

button_jh.grid(row=6,column=2)

button_jia.grid(row=6,column=3)

def cai_dan(top_var):

menu = Menu(top_var)

sub_menu_1 = Menu(menu,tearoff=0)

menu.add_cascade(label='查看',menu=sub_menu_1)

sub_menu_2 = Menu(menu, tearoff=0)

sub_menu_2.add_command(label='复制')

sub_menu_2.add_command(label='粘贴')

menu.add_cascade(label='编辑',menu=sub_menu_2)

sub_menu = Menu(menu, tearoff=0)

sub_menu.add_command(label='查看帮助')

sub_menu.add_separator()

sub_menu.add_command(label='关于计算机')

menu.add_cascade(label='帮助',menu=sub_menu)

top_var.config(menu=menu)

if __name__ == "__main__":

bu_ju(top)

cai_dan(top)

top.mainloop()