coding a straight line with tkinter code example

Example 1: tkinter draw squaer

canvas.create_rectangle(30, 10, 120, 80,
    outline="#fb0", fill="#fb0")

Example 2: how to draw polygon in tkinter

from tkinter import *

root = Tk()

c = Canvas(root)
c.pack()

points = [x1,y1, x2,y2, xn,yn]
c.create_polygon(points)

root.mainloop()