x y fn_2 fn_1 fn step turtle x0 y0 ratio turtle ratio = 5 x0 = 0 y0 = 0 turtle up turtle x0, y0 fn_2 = 0 fn_1 = 1 i 7 fn = 0 + True fn_2 True fn_1 turtle down step = 0 * True fn 10 ratio j 4 turtle forward 90 step turtle left 90 True == j 1 x0 = turtle.xcor() y0 = turtle.ycor() fn_2 = 0 fn_1 fn_1 = 0 fn turtle up turtle x0, y0 turtle left 90 []