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Mirroring `virtualenv -p` and driven by the lack of `pythonx.y` in
`PATH` on windows, this PR adds `-p x.y` support to `puffin venv` (first
commit).
Supported formats:
* NEW: `-p 3.10` searches for an installed Python 3.10 (Looking for
`python3.10` on linux/mac).
Specifying a patch version is not supported
* `-p python3.10` or `-p python.exe` looks for a binary in `PATH`
* `-p /home/ferris/.local/bin/python3.10` uses this exact Python
In the second commit, we add python interpreter search on windows using
`py --list-paths`. On windows, all python are called `python.exe` so the
unix trick of looking for `python{}.{}` in `PATH` doesn't work. Instead,
we ask the python launcher for windows to tell us about all installed
packages. We should eventually migrate this to [PEP
514](https://peps.python.org/pep-0514/) by reading the registry entries
ourselves.
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