Generate a range of random 'codes' for Santa on the Square photo service

rangen.py

import random
import string
import subprocess
from PIL import Image
from PIL import ImageFont
from PIL import ImageDraw 
 
codes = []
 
for i in range(1, 251):
 
    char_pool = string.ascii_uppercase + string.digits
 
    # Generate a random code
    r = ''.join([random.choice(char_pool) for n in xrange(5)])
 
    # Check generated code against pre-existing codes.
    if r not in codes:
        codes.append(r)

        # Open template image and draw on it
        img = Image.open("template.png")
        draw = ImageDraw.Draw(img)  
        font = ImageFont.truetype("Inconsolata.otf", 72)
        draw.text((430, 527), str(i), (0,0,0), font=font)
        draw.text((430, 706), str(r), (0,0,0), font=font)

        # save 
        img.save('./cards/%02d%s.png' % (i, r))
 
        print "Created card for #%s, Code: %s" % (i, r)

print "Merging all cards into a single PDF..."

subprocess.call('convert ./cards/* output.pdf', shell=True)