import turtle


def draw_polygon(my_turtle, sides, size):
    '''draw_polygon function accepts an instance of turtle,
        and draws a polygon of a given sides and size'''

    angle = 360.0 / sides

    for i in range(sides):
        if my_turtle.color()[0] == "red":
            my_turtle.color("black")
        else:
            my_turtle.color("red")

        my_turtle.forward(size)
        my_turtle.left(angle)


# our main code
wn = turtle.Screen()
wn.bgcolor("lightblue")

dana = turtle.Turtle()
draw_polygon(dana, 6, 100)
dana.right(180)
draw_polygon(dana, 5, 100)

# wn.mainloop()
turtle.done()