PYTHON TURTLE GRAPHICS write a non pure function procedure

PYTHON & TURTLE GRAPHICS

write a non pure function (procedure) named drawstar that takes no arguments and draws a 5 pointed star using python turtle graphics : the drawsar procedure should do the following : open a turtle dialogue box and have the user enter the length of each side. draw a five pointed star with each side length as entered by the user. (hint: the internal angle of each points is 36 degrees) to be honest, i really want to know how to do this on my own so if anybody could guide me it would be great. I am confused on how to assign the side length to the user input box, which is the turtle.numinput() command i believe. PLEASE help and please try to explain..

Solution

import sys

import turtle

def border(t, screen_x, screen_y):

    \"\"\"(Turtle, int, int)

    Draws a border around the canvas in red.

    \"\"\"

    # Lift the pen and move the turtle to the center.

    t.penup()

    t.home()

    # Move to lower left corner of the screen; leaves the turtle

    # facing west.

    t.forward(screen_x / 2)

    t.right(90)

    t.forward(screen_y / 2)

    t.setheading(180)           # t.right(90) would also work.

   

    # Draw the border

    t.pencolor(\'red\')

    t.pendown()

    t.pensize(10)

    for distance in (screen_x, screen_y, screen_x, screen_y):

        t.forward(distance)

        t.right(90)

    # Raise the pen and move the turtle home again; it\'s a good idea

    # to leave the turtle in a known state.

    t.penup()

    t.home()

def square(t, size, color):

    \"\"\"(Turtle, int, str)

    Draw a square of the chosen colour and size.

    \"\"\"

    t.pencolor(color)

    t.pendown()

    for i in range(4):

        t.forward(size)

        t.right(90)

def main():

    # Create screen and turtle.

    screen = turtle.Screen()

    screen.title(\'Square Demo\')

    screen_x, screen_y = screen.screensize()

    t = turtle.Turtle()

    # Uncomment to draw the graphics as quickly as possible.

    ##t.speed(0)

    # Draw a border around the canvas

    border(t, screen_x, screen_y)

    # Draw a set of nested squares, varying the color.

    # The squares are 10%, 20%, etc. of half the size of the canvas.

    colors = [\'red\', \'orange\', \'yellow\', \'green\', \'blue\', \'violet\']

    t.pensize(3)

    for i, color in enumerate(colors):

        square(t, (screen_y / 2) / 10 * (i+1), color)

    print(\'Hit any key to exit\')

    dummy = input()

       

if __name__ == \'__main__\':

    main()