How do I create code in Python using "simplegui" circle in fixed position that change/rotate colors "continuously" from a list of colors = ["red","green","blue","yellow"]...?

My starting code is as follows:

import simplegui

define draw(canvas)

colors = ["red","green","blue","yellow"]

canvas.draw_circle( [200,200], 300, 10, _____, _____ )

frame = simplegui.create_frame("Color Changing Circle", 400, 400 )

frame,set_draw_handler(draw)

frame.start()