Summary

pyenv works fine when an explicit python- prefix is added to the Python version when full versions are specified (for example python-3.12.6), however, fails to find a matching Python version if the "auto-resolve latest version" feature is used with a python- prefix (such as python-3.12).

ie:

• Works: 3.12, 3.12.6, python-3.12.6
• Doesn't work: python-3.12

This appears to be due to the python- prefix removal here only covering the exact match case, and not the pyenv-latest code-path:

I will open a PR for this.

Prerequisite

• Make sure your problem is not listed in the common build problems.
• Make sure no duplicated issue has already been reported in the pyenv issues. You should look for closed issues, too.
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Description

• Platform information (e.g. Ubuntu Linux 16.04): macOS 14.6.1
• OS architecture (e.g. amd64): arm64
• pyenv version: 2.4.12
• Python version: 3.12.6
• C Compiler information (e.g. gcc 7.3): N/A
• Please attach the debug trace of the failing command as a gist:
  • Run env PYENV_DEBUG=1 <faulty command> 2>&1 | tee trace.log and attach trace.log. E.g. if you have a problem with installing Python, run env PYENV_DEBUG=1 pyenv install -v <version> 2>&1 | tee trace.log (note the -v option to pyenv install).

1. pyenv install 3.12.6
2. mkdir pyenv-test && cd $_
3. echo 'python-3.12' > .python-version
4. pyenv versions

Expected

$ pyenv versions
  system
* 3.12.6 (set by /Users/emorley/src/pyenv-test/.python-version)

ie: The same as if I had instead saved either 3.12 or python-3.12.6 into the .python-version file (both of which work fine, unlike python-3.12).

Actual

$ pyenv versions
pyenv: version `python-3.12' is not installed (set by /Users/emorley/src/pyenv-test/.python-version)
  system
  3.12.6

Trace: trace.log

Though as mentioned above, the cause seems clear and I'm happy to open a PR for this :-)