from tkinter import *
root = Tk()
c = Canvas(root)
c.pack()
points = [x1,y1, x2,y2, xn,yn]
c.create_polygon(points)
root.mainloop()
create_polygon()
create_polygon(points, fill)
create_polygon(points, fill, outline, width)
create_polygon(points, fill, outline)
create_polygon(points, y, x2, y2, x3, y3, fill)