A python script to generate a wallet-sized "table recta" for passwords

tabla_recta.py

#!/usr/bin/python

# This code is public domain, share and enjoy.

import random, re, sys, os

seed = None
if len(sys.argv) > 1:
  seed = int(sys.argv[1])

# Output not redirected
if os.fstat(0) == os.fstat(1):
  print >>sys.stderr, """
  Tabla Recta generator.  Outputs PS to stdout.

    Usage: %s [seed] > table.ps

  """ % sys.argv[0]
  exit()
  
if seed:
  print >>sys.stderr, "\nGenerating table with seed:", seed, "\n"
  r = random.Random(seed)
else:
  print >>sys.stderr, "\nGenerating table with random seed.\n"
  r = random.Random()

head = [chr(65+i) for i in range(26)]

lines = []
lines.append(' '.join(['.', ' '.join(head), '.']))
for i in range(13):
  row = [ chr(r.randint(33,117)) for j in range(26)]
  lines.append(' '.join([chr(65+i), ' '.join(row), chr(78+i)]))

print """%!PS
/Courier 7 selectfont
/nl { 9 sub dup 72 exch moveto } def
720"""

for line in lines:
  line = re.sub(r'([()\\])',r'\\\1', line)
  line = re.sub(r'`', r'\\301', line)
  print "nl (%s) show" % line

print "showpage"