Draw Rainbow using Turtle Graphics in Python

# Import turtle package
import turtle

# Creating a turtle screen object
sc = turtle.Screen()

# Creating a turtle object(pen)
pen = turtle.Turtle()

# Defining a method to form a semicircle
# with a dynamic radius and color
def semi_circle(col, rad, val):

    # Set the fill color of the semicircle
    pen.color(col)

    # Draw a circle
    pen.circle(rad, -180)

    # Move the turtle to air
    pen.up()

    # Move the turtle to a given position
    pen.setpos(val, 0)

    # Move the turtle to the ground
    pen.down()

    pen.right(180)


# Set the colors for drawing
col = ['violet', 'indigo', 'blue', 
       'green', 'yellow', 'orange', 'red']

# Setup the screen features
sc.setup(600, 600)

# Set the screen color to black
sc.bgcolor('black')

# Setup the turtle features
pen.right(90)
pen.width(10)
pen.speed(7)

# Loop to draw 7 semicircles
for i in range(7):
    semi_circle(col[i], 10*(
      i + 8), -10*(i + 1))

# Hide the turtle
pen.hideturtle()

import turtle

mypen= turtle.Turtle()
mypen.shape('turtle')
mypen.speed(10)

window= turtle.Screen()
window.bgcolor('white')
rainbow= ['red','orange','yellow','green','blue','indigo','violet']
size= 180
mypen.penup()
mypen.goto(0,-180)
for color in rainbow:
    mypen.color(color)
    mypen.fillcolor(color)
    mypen.begin_fill()
    mypen.circle(size)
    mypen.end_fill()
    size-=20

turtle.done()