Pre-commit: Specify default python version, rely on shebang

[akien-mga]

Alternative to #90634, needs testing.

Works for me on Linux with a python3 in PATH. Not sure how reliable this approach is, it's unclear for me in the pre-commit docs how running Python scripts should be done properly. The default version is defined following https://pre-commit.com/#overriding-language-version (but I tried e.g. with python2 and it fails as it tries to start a python2 venv from python3 which doesn't work... so not sure how much this is helping).

You can test with pre-commit run --all.

CC @nlupugla @bruvzg

[chrisl8]

This did not work for me on Windows. It works better than the default setup (without making any system modifications), but some thing still fail.

PS C:\Users\chris\CLionProjects\godot> pre-commit run --all
[INFO] Installing environment for https://github.com/pre-commit/mirrors-clang-format.
[INFO] Once installed this environment will be reused.
[INFO] This may take a few minutes...
[INFO] Installing environment for https://github.com/psf/black-pre-commit-mirror.
[INFO] Once installed this environment will be reused.
[INFO] This may take a few minutes...
[INFO] Installing environment for local.
[INFO] Once installed this environment will be reused.
[INFO] This may take a few minutes...
clang-format.............................................................Passed
black....................................................................Passed
make-rst.................................................................Failed
- hook id: make-rst
- exit code: 1

[WinError 3] The system cannot find the path specified

copyright-headers........................................................Passed
dotnet-format............................................................Passed

[bruvzg]

This will use shebang in the scripts, so on macOS dotnet_format.py will fail since it's using python (it's also missing +x so won't run at all). I do not think default_language_version do anything at all.

[akien-mga]

This doesn't work, so closing.