The uuid4() function of Python's module uuid generates a random UUID, and seems to generate a different one every time: In [1]: import uuid In [2]: uuid.uuid4() Out[2]: UUID('f6c9ad6c-eea0-4049-a7c5-56253bc3e9c0') In [3]: uuid.uuid4() Out[3]: UUID('2fc1b6f9-9052-4564-9be0-777e790af58f') I would like to be able to generate the same random UUID every time I run a script - that is, I'd like to seed the random generator in uuid4(). Is there a way to do this? (Or achieve this by some other means)? What I've tried so far I've to generate a UUID using the uuid.UUID() method with a random 128-bit integer (from a seeded instance of random.Random()) as input: import uuid import random rd = random.Random() rd.seed(0) uuid.UUID(rd.getrandbits(128)) However, UUID() seems not to accept this as input: Traceback (most recent call last): File "uuid_gen_seed.py", line 6, in <module> uuid.UUID(rd.getrandbits(128)) File "/usr/lib/python2.7/uuid.py", line 133, in __init__ hex = hex.replace('urn:', '').replace('uuid:', '') AttributeError: 'long' object has no attribute 'replace' Any other suggestions? Continue reading...