[Python] Iterate over individual bytes in Python 3

When iterating over a bytes object in Python 3, one gets the individual bytes as ints:

>>> [b for b in b'123']
[49, 50, 51]


How to get 1-length bytes objects instead?

The following is possible, but not very obvious for the reader and most likely performs bad:

>>> [bytes() for b in b'123']
[b'1', b'2', b'3']

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