猫史档案馆

import tkinter as tk
import time
import tkinter.messagebox as box
from math import *

root = tk.Tk()
root.title('模拟计算机')
root.geometry('330x390')
var_value = tk.StringVar()
var_count = tk.StringVar()
var_value.set('0')

def click(value = ''):
    try:
        entry_value.insert('insert',str(value))
    except:
        pass

def count():
    try:
        if entry_value.get() == '':
            var_value.set('0')
        else:
            var_value.set(str(eval(entry_value.get())))
    except:
        box.showerror(title = '错误提示',message = '表达式错误')

def delete():
    try:
        var_count.set(var_count.get()[0:-1])
    except:
        pass

def clean(mode = 'end'):
    try:
        entry_value.delete(0,'end')
    except:
        pass


entry_value = tk.Entry(root,textvariable = var_count,bd = 4,width = 20,font = ('Arial',20))
label_value = tk.Label(root,textvariable = var_value,font = ('Arial',20))


#第一行（x = 0,y = 90）
tk.Button(root,text = 'C',font = ('Arial',20),width = 3,height = 1,command = clean).place(x = 0,y = 90)
tk.Button(root,text = '⇦',font = ('Arial',20),width = 3,height = 1,command = delete).place(x = 60,y = 90)
tk.Button(root,text = 'π',font = ('Arial',20),width = 3,height = 1,command = lambda:click('(pi)')).place(x = 120,y = 90)
tk.Button(root,text = 'e',font = ('Arial',20),width = 3,height = 1,command = lambda:click('(e)')).place(x = 180,y = 90)

#第二行（x = 0,y = 150）
tk.Button(root,text = '7',font = ('Arial',20),width = 3,height = 1,command = lambda:click('7')).place(x = 0,y = 150)
tk.Button(root,text = '8',font = ('Arial',20),width = 3,height = 1,command = lambda:click('8')).place(x = 60,y = 150)
tk.Button(root,text = '9',font = ('Arial',20),width = 3,height = 1,command = lambda:click('9')).place(x = 120,y = 150)
tk.Button(root,text = '+',font = ('Arial',20),width = 3,height = 1,command = lambda:click('+')).place(x = 210,y = 150)
tk.Button(root,text = '^',font = ('Arial',20),width = 3,height = 1,command = lambda:click('**')).place(x = 270,y = 150)

#第三行（x = 0,y = 210）
tk.Button(root,text = '4',font = ('Arial',20),width = 3,height = 1,command = lambda:click('4')).place(x = 0,y = 210)
tk.Button(root,text = '5',font = ('Arial',20),width = 3,height = 1,command = lambda:click('5')).place(x = 60,y = 210)
tk.Button(root,text = '6',font = ('Arial',20),width = 3,height = 1,command = lambda:click('6')).place(x = 120,y = 210)
tk.Button(root,text = '-',font = ('Arial',20),width = 3,height = 1,command = lambda:click('-')).place(x = 210,y = 210)
tk.Button(root,text = '%',font = ('Arial',20),width = 3,height = 1,command = lambda:click('%')).place(x = 270,y = 210)

#第四行（x = 0,y = 270）
tk.Button(root,text = '1',font = ('Arial',20),width = 3,height = 1,command = lambda:click('1')).place(x = 0,y = 270)
tk.Button(root,text = '2',font = ('Arial',20),width = 3,height = 1,command = lambda:click('2')).place(x = 60,y = 270)
tk.Button(root,text = '3',font = ('Arial',20),width = 3,height = 1,command = lambda:click('3')).place(x = 120,y = 270)
tk.Button(root,text = '×',font = ('Arial',20),width = 3,height = 1,command = lambda:click('*')).place(x = 210,y = 270)
tk.Button(root,text = '()',font = ('Arial',20),width = 3,height = 1,command = lambda:click('()')).place(x = 270,y = 270)

#第五行（x = 0,y = 330）
tk.Button(root,text = '00',font = ('Arial',20),width = 3,height = 1,command = lambda:click('00')).place(x = 0,y = 330)
tk.Button(root,text = '0',font = ('Arial',20),width = 3,height = 1,command = lambda:click('0')).place(x = 60,y = 330)
tk.Button(root,text = '.',font = ('Arial',20),width = 3,height = 1,command = lambda:click('.')).place(x = 120,y = 330)
tk.Button(root,text = '÷',font = ('Arial',20),width = 3,height = 1,command = lambda:click('/')).place(x = 210,y = 330)
tk.Button(root,text = '=',font = ('Arial',20),width = 3,height = 1,command = count).place(x = 270,y = 330)


entry_value.pack()
label_value.pack()

root.mainloop()