Add a typing stub to smbus2

[MageJohn]

I'm using Python 3 type hinting and mypy static type analysis in my project using smbus2, so I created a type stub for smbus2. This may be useful for other people, so here's a pull request.

For more info see the mypy docs and PEP 561.

Links:

• https://mypy.readthedocs.io/en/latest/stubs.html
• https://mypy.readthedocs.io/en/latest/installed_packages.html
• https://www.python.org/dev/peps/pep-0561

[kplindegaard]

Thanks, @MageJohn I haven't used mypy myself, so I need to ask a novice question: We're not introducing any backwards compatibility issues with this? These are all supplementary stubs and meta that won't introduce problems in Python 2.7 or <3.5?

[MageJohn]

That's right; only the software that will be doing the type checking will look for the .pyi file, as far as I know. Even in versions of python >= 3.5 it doesn't have an effect at runtime, just when mypy is run.

On Sat, Aug 22, 2020 at 1:01 PM Karl-Petter Lindegaard < notifications@github.com> wrote:

Thanks, @MageJohn https://github.com/MageJohn I haven't used mypy myself, so I need to ask a novice question: We're not introducing any backwards compatibility issues with this? These are all supplementary stubs and meta that won't introduce problems in Python 2.7 or <3.5?

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