How to automatically pick up maximum supported Python version

[lmmx]

I don't suppose this is exposed in any metadata besides this error message is there?

  error: the configured Python version (3.15) is newer than PyO3's maximum supported version (3.14)

If this is exposed somewhere else then please let me know what I've overlooked instead, thanks :-)

[lmmx]

aha, I was thinking along env var lines this is much easier:

pyo3/pyo3-ffi/Cargo.toml

Lines 52 to 54 in 1a3e53f

	[package.metadata.cpython]
	min-version = "3.7"
	max-version = "3.14" # inclusive

hmmm

(comrak) louis 🌟 ~/dev/comrak $ cargo tree -i pyo3-ffi
pyo3-ffi v0.27.0
└── pyo3 v0.27.0
    └── comrak v0.1.0 (/home/louis/dev/comrak)

So I can get at this automatically via

PYO3_FFI_VERSION=$(cargo tree -i pyo3-ffi --edges no-dev,no-build,no-proc-macro --prefix none | head -n1 | cut -d " " -f 2 | sed 's/^v//')

or for situations without cargo // otherwise avoiding it (like possibly in CI before building it)

PYO3_FFI_VERSION=$(grep -m 1 -A 1 'name = "pyo3-ffi"' Cargo.lock | tail -n1 | cut -d '"' -f 2)

then use it to get the version

curl -sL "https://static.crates.io/crates/pyo3-ffi/pyo3-ffi-$PYO3_FFI_VERSION.crate" \
  | tar -xzO "pyo3-ffi-$PYO3_FFI_VERSION/Cargo.toml" \
  | uvx --from=toml-cli toml get --toml-path=/dev/stdin package.metadata.cpython.max-version \
  | tr -d '"'
3.14