Pretty Spirals

spiral.py

from turtle import *

'''
Animated result: http://imgur.com/H49ukwF.gif

This script saves each image as 000.ps, 001.ps, ..., 180.ps
The Postscript files can be converted to jpgs/pngs using imagemagick:

$ convert -density 200 -geometry 50% -flatten 180.ps 180.png

To generate an animated gif, use imagemagick again:

$ convert -delay 1 -loop 0 *.png animation.gif
'''

for angle in range(0, 181):
    reset()
    speed(9)
    left(90)
    for length in range(10, 301, 5):
        right(angle)
        forward(length)
    filename = '{:03d}.ps'.format(angle)
    with open(filename, 'w') as fd:
        fd.write(Screen().getcanvas().postscript())