For when you need some random keys as a string, with optional starting value and optional length

randomKey.py

import random
def randomKey(start=None, bytes=16):
  if start is None:
    part = "%02x" % random.randint(0,255)
    return randomKey(part, bytes)
  elif len(start.split(" ")) == bytes:
    return start
  else:
    part = "%s %02x" % (start, random.randint(0,255))
    return randomKey(part, bytes)