Add placeholders containing Python version and/or wheel leafname and system information

[julian-smith-artifex-com]

Description

Could cibuildwheel define a new placeholder {python-version} set to things like 3.14, for use in CIBW_TEST_COMMAND?

This would allow gathering of pytest results with pytest --junit-xml=test-results{pythonversion}-xml when cibuildwheel builds and tests for a range of Python versions.

At the moment with something like CIBW_BUILD='cp310* cp311* cp312* cp313* cp314*' and CIBW_TEST_COMMAND='pytest --junit-xml=test-results.xml', the invocation of pytest for each python version overwrites the existing test-results.xml file, so we can't gather complete information.

It might be useful to have more information than just the python version. In which case how about:

• A {wheel-leafname} placeholder that identifies the exact wheel that was tested.
• A {system} placeholder containing a wheel name-style <python-tag>-<abi-tag>-<platform-tag> string to identify the environment in which tests were run?

Build log

No response

CI config

No response

[joerick]

I think the use-case is valid, and #944 could be a more general solution to this problem. The test-command is run in a shell, so you could expand the environment variable with that.