Hashing with SHA256

hash-sha265.py

#!/usr/bin/env python3.0
 
import hashlib
import sys
 
algorithm = dict(
  sha256 = lambda x: hashlib.sha256(x).hexdigest()
)
 
def usage():
  print 'Usage: python hash.py sha256 [text-to-hash]'
 
if __name__ == '__main__':
 
  try:
    result = algorithm[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 result(text)