Python bytes, not Bytes just like the line above

[cclauss]

Summary

https://docs.python.org/3/library/stdtypes.html#bytes
https://docs.python.org/3/library/stdtypes.html#binary-sequence-types-bytes-bytearray-memoryview

Checklist

• If code changes were made then they have been tested.
  • I have updated the documentation to reflect the changes.
• This PR fixes an issue.
• This PR adds something new (e.g. new method or parameters).
• This PR is a breaking change (e.g. methods or parameters removed/renamed)
• This PR is not a code change (e.g. documentation, README, ...)

[jgayfer]

This looks like a lot of copy paste. For example, we don't have tests for pytest to execute.

[CodeWithSwastik]

@FrostByte266 is already setting unittests and CI up.

[cclauss]

@CodeWithSwastik Your review, please.