uuid - Is python uuid1 sequential as timestamps?

Question

Python docs states that uuid1 uses current time to form the uuid value. But I could not find a reference that ensures UUID1 is sequential.

>>> import uuid
>>> u1 = uuid.uuid1()
>>> u2 = uuid.uuid1()
>>> u1 < u2
True
>>> 

Answer 1

But not always:

>>> def test(n):
...     old = uuid.uuid1()
...     print old
...     for x in range(n):
...             new = uuid.uuid1()
...             if old >= new:
...                     print "OOops"
...                     break
...             old = new
...     print new
>>> test(1000000)
fd4ae687-3619-11e1-8801-c82a1450e52f
OOops
00000035-361a-11e1-bc9f-c82a1450e52f