Draw Rainbow using Turtle Graphics in Python

Turtle is an inbuilt module in Python. 

It provides: 

1-Drawing using a screen (cardboard).

2-Turtle (pen).

Here's the source code for rainbow diagram using python

Output of the below source code 

# 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()