Notify sessions with multiple interpreters

[leodevian]

How would this feature be useful?

This would enable notifying sessions with multiple interpreters. Today, running nox against the following noxfile.py will only run coverage and tests under Python 3.10. I feel like it should run tests under all interpreters.

import nox

nox.options.sessions = ["coverage"]


@nox.session
def coverage(session: nox.Session) -> None:
    """Erase coverage."""
    session.install("coverage")
    session.run("coverage", "erase")
    session.notify("tests")


@nox.session(python=("3.10", "3.11", "3.12", "3.13"))
def tests(session: nox.Session) -> None:
    """Run tests and collect coverage."""
    session.install(".")
    session.install("pytest", "coverage")
    session.run("coverage", "run", "-m", "pytest")

Describe the solution you'd like

I would update nox.manifest.Manifest.notify with the following code to catch all matching sessions.

nox/nox/manifest.py

Lines 400 to 407 in 6f3a459

	# Locate the session in the list of all sessions, and place it at
	# the end of the queue.
	for s in self._all_sessions:
	if s == session or s.name == session or session in s.signatures: # noqa: PLR1714
	if posargs is not None:
	s.posargs = list(posargs)
	self._queue.append(s)
	return True

# Locate the sessions in the list of all sessions.
sessions: list[SessionRunner] = []

for s in self._all_sessions:
    if s == session or s.name == session or session in s.signatures:  # noqa: PLR1714
        if posargs is not None:
            s.posargs = list(posargs)
        sessions.append(s)

# Place sessions at the end of the queue.
if sessions:
    self._queue.extend(sessions)
    return True

Describe alternatives you've considered

Today, I can chain those sessions using nox.options.sessions, but that forces me to declare them as default sessions.

Anything else?

If this gets approved, could I do the PR myself? It would be my first contribution ever.