python - Should I seed the random number generator?

Question

From the docs:

random.seed(a=None, version=2) Initialize the random number generator.

If a is omitted or None, the current system time is used. If randomness sources are provided by the operating system, they are used instead of the system time (see the os.urandom() function for details on availability).

But...if it's truly random...(and I thought I read it uses Mersenne, so it's VERY random)...what's the point in seeding it? Either way the outcome is unpredictable...right?

Answer 1

The default is probably best if you want different random numbers with each run. If for some reason you need repeatable random numbers, in testing for instance, use a seed.