In this python turtle project, you are going to draw a 7-color rainbow and a 49-color rainbow. You need to know for loop, drawing circle, and converting HSV (Hue-Saturation-Value) colorspace to RGB colorspace using the colorsys library.
Code:
import turtle
import colorsys
def draw_one_color_arc(x,y,r,pensize,color):
turtle.up()
turtle.goto(x+r,y)
turtle.down()
turtle.seth(90)
turtle.pensize(pensize)
turtle.pencolor(color)
turtle.circle(r,180)
turtle.speed(0)
turtle.hideturtle()
turtle.bgcolor('light blue')
turtle.title('49-Color Rainbow')
turtle.setup(700,700)
num_colors = 49
radius = 300
penwidth = 20*7/num_colors
hue = 0
for i in range(num_colors):
(r,g,b) = colorsys.hsv_to_rgb(hue,1,1)
draw_one_color_arc(0,-100,radius,penwidth,(r,g,b))
radius -= (penwidth-1) #overlapping a little removes the gaps
hue += 0.9/num_colors
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