如何用python做一个简单的输入输出交互界面?

# 简易计算器

# 导入tkinter模块所有方法
from tkinter import *

# 声明全局变量
expression = ""

# 更新表达式功能
def press(num):
 # point out the global expression variable
 global expression
 # concatenation of string
 expression = expression + str(num)
 # update the expression by using set method
 equation.set(expression)
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# 导入tkinter的所有方法
from tkinter import *
# 导入日历模块
import calendar

# 给定年份显示日历
def showCal():
    # 创建GUI窗口
    new_gui = Tk()
    # 设定GUI窗口背景颜色
    new_gui.config(background="white")
    # 设定GUI窗口名称
    new_gui.title("日历")
    # 设定GUI窗口尺寸
    new_gui.geometry("550x600")
    # get method returns current text as string
    fetch_year = int(year_field.get())
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