This advice doesn't appear to be universally true. There are different versions of UUID, including version 4 for truely "random" (or pseudo-random) UUIDs. Loo

This advice doesn't appear to be universally true. There are different versions of UUID, including version 4 for truely "random" (or pseudo-random) UUIDs. Looking at the python implementation: http://docs.python.org/2/library/uuid.html http://docs.python.org/2/library/uuid.html def uuid4(): """Generate a random UUID.""" # When the system provides a version-4 UUID generator, use it. if _uuid_generate_random: _buffer = ctypes.create_string_buffer(16) _uuid_generate_random(_buffer) return UUID(bytes=_buffer.raw) # Otherwise, get randomness from urandom or the 'random' module. try: import os return UUID(bytes=os.urandom(16), version=4) except: import random bytes = [chr(random.randrange(256)) for i in range(16)] return UUID(bytes=bytes, version=4)