No python_requires defined

[vytas7]

Checklist

• The bug is reproducible against the latest release or master.
• There are no similar issues or pull requests to fix it yet.

Describe the bug

It seems that no python_requires is defined for the uvicorn package, which in turn results in the latest version being installed in a Python 3.6 (CI) environment (that subsequently fails).

If python_requires were defined to restrict the package to supported versions of the interpreter, I would have got an older version (that supported py36) instead.

Steps to reproduce the bug

In a py36 environment

pip install uvicorn
# Run uvicorn
# ...

Expected behavior

An older version is installed that works.

Actual behavior

uvicorn errors out, says py36 is unsupported.

Debugging material

No response

Environment

CPython 3.6

Additional context

No response

[Kludex]

PR welcome to add python_requires.

[vytas7]

Thanks @Kludex, I'll try to open one later today!
(Although it's obviously too late for the 3.6 case unless you are willing to yank the current version later.)

[Kludex]

I don't have the power to yank the current version. We should ask @tomchristie for that, but I'm not sure if it's that necessary.

The recommendation on zero version is to pin the package version.

In any case, that line of code will be useful in the future.

[vytas7]

@Kludex I've now opened a PR: #1328.