The documentation https://docs.python.org/3/library/random.html#random.Random says:

> class random.Random([seed])¶

But in reality the parameter is called "x" not "seed" (CPython 3.9):

>>> import random
>>> random.Random(seed=0)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: __init__() got an unexpected keyword argument 'seed'
>>> random.Random(x=0)
<random.Random object at 0x20ddc10>

Same goes for random.SystemRandom

It would be better to rename "x" to "seed" but that's not backwards compatible.