Iterate over individual bytes in Python 3

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If you are concerned about performance of this code and an int as a byte is not suitable interface in your case then you should probably reconsider data structures that you use e.g., use str objects instead.

You could slice the bytes object to get 1-length bytes objects:

L = [bytes_obj[i:i+1] for i in range(len(bytes_obj))]

There is PEP 0467 — Minor API improvements for binary sequences that proposes bytes.iterbytes() method:

>>> list(b'123'.iterbytes())
[b'1', b'2', b'3']

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