Text hashing (sha1,md5,sha256)

pyhash.py

#!/usr/bin/env python2.7
 
import hashlib
 
algorithms = dict(
  md5 = lambda s: hashlib.md5(s).hexdigest(),
  sha1 = lambda s: hashlib.sha1(s).hexdigest(),
  sha256 = lambda s: hashlib.sha256(s).hexdigest(),
)
 
 
def usage():
  print 'Usage:', sys.argv[0], '<algorithm> [text to hash]'
  print 'Select algorithm for hash:'
  for algo in algorithms:
    print '\t', algo
 
 
if __name__ == '__main__':
 
  import sys
 
  try:
    algo = algorithms[sys.argv[1]]
  except (KeyError, IndexError):
    usage()
    sys.exit(1)
 
  if len(sys.argv) > 2:
    text = sys.argv[2]
  else:
    text = sys.stdin.read()
 
  print algo(text)