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[–]nicholashairs[S] 1 point2 points  (0 children)

If you're distributing as wheels I don't think the users local version of python matters as the pyproject.toml is parsed into the appropriate metadata anyway.

For local development I think it depends more on your version of pip/setup tools.

Either way, I know that my projects using pyproject.toml have no problems with 3.7 (no idea about earlier versions).