# 导入所需库
from tkinter import *

# 创建Tkinter框架实例
win = Tk()

# 设置geometry
win.geometry("700x350")

# 定义一个画布小部件
canvas = Canvas(win, width=500, height=350)
canvas.pack()

# 在画布中创建一个矩形
canvas.create_rectangle(100,100,300,300, outline= 'yellow', width=4, fill='green')

win.mainloop()