Download drawings from scri.ch

scrich-dl.py

"""
    # Run this script to download scri.ch drawings.
    python3 scrich-dl.py
    # You can then put all the drawing to the same size with imagemagick.
    for f in *.png; do convert $f -gravity CENTER -extent 1920x1080  $f; done;
    # And make a video from them with ffmpeg.
    ffmpeg -r 25 -f image2 -s 1920x1080 -pattern_type glob -i "*.png"  -vcodec libx264 -crf 25 -pix_fmt yuv420p anim.mp4
"""

import urllib.request

http_errors_allowed = 100
i = 0

def dec_to_base(num, base):
    base_num = ""
    while num>0:
        dig = int(num%base)
        if dig<10:
            base_num += str(dig)
        else:
            base_num += chr(ord('a')+dig-10)
        num //= base
    base_num = base_num[::-1]
    return base_num

while http_errors_allowed > 0:
    i+=1
    url = 'http://scri.ch/{}.png'.format(dec_to_base(i, 36))
    path = '{:05d}.png'.format(i)
    print('download {} to {}'.format(url, path))
    try:
        urllib.request.urlretrieve(url, path)
    except urllib.error.HTTPError as e:
        print('HTTP error', e)
        http_errors_allowed -= 1