#!/usr/bin/env python
# encoding: utf-8
from tkinter import *
top = Tk()
top.title('计算器')
top.grid_size()
label0 = Label(top, text='计算器', font='仿宋 24 bold', width=20, height=2)
label0.grid(row=0, column=1, columnspan=3, rowspan=2)
label1 = Label(top, text='输入参数一：', font='楷体 13', width=16, height=1)
label1.grid(row=2, column=0)
label2 = Label(top, text='输入参数二：', font='楷体 13', width=16, height=1)
label2.grid(row=3, column=0)
input1 = Entry(top, width=20)
data1 = int(input1.get())
input1.grid(row=2, column=1)
input2 = Entry(top, width=20)
data2 = int(input2.get())
input2.grid(row=3, column=1)
button1 = Button(top, text='滚加', width=20, height=1)
button1.grid(row=6, column=0)
jieguo = Text(top, width=40, height=6)
jieguo.grid(row=2, column=2, rowspan=4, columnspan=2)
button6 = Button(top, text='退出', command=top.quit(), width=110)
button6.grid(row=8, column=0, columnspan=5)
mainloop()
做的一个小计算器，具体计算过程还没写，刚写了一个可视界面，运行时报错，问问各位大神，(=@__@=)哪里错了
data1 = int(input1.get())
ValueError: invalid literal for int() with base 10: ''
