[1/3] Very minor NFC (emerged from ruff)

[PhilipVinc]

Some very very minor minor changes that I am removing from #110 to make review easier.
Those were detected by running ruff over the codebase.

The main question I have is why you were using __copy__()instead of copy.copy (which ok, just calls __copy__, but seems to me a bit more readable..)

[coveralls]

Pull Request Test Coverage Report for Build 6364520918

• 14 of 14 (100.0%) changed or added relevant lines in 5 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 100.0%

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Totals
Change from base Build 6282717489:	0.0%
Covered Lines:	938
Relevant Lines:	938

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💛 - Coveralls

[wesselb]

You're totally right that using copy is more clear! Thanks for this. :)