v0.25.0

Full Changelog: v0.24.0...v0.25.0

Breaking changes

• The strict_exception_groups parameter now defaults to True in trio.run and trio.lowlevel.start_guest_run. trio.open_nursery still defaults to the same value as was specified in trio.run/trio.lowlevel.start_guest_run, but if you didn't specify it there then all subsequent calls to trio.open_nursery will change.
  This is unfortunately very tricky to change with a deprecation period, as raising a DeprecationWarning whenever strict_exception_groups is not specified would raise a lot of unnecessary warnings.

  Notable side effects of changing code to run with strict_exception_groups==True

  • If an iterator raises StopAsyncIteration or StopIteration inside a nursery, then python will not recognize wrapped instances of those for stopping iteration.

  • trio.run_process is now documented that it can raise an ExceptionGroup. It previously could do this in very rare circumstances, but with strict_exception_groups set to True it will now do so whenever exceptions occur in deliver_cancel or with problems communicating with the subprocess.

    • Errors in opening the process is now done outside the internal nursery, so if code previously ran with strict_exception_groups=True there are cases now where an ExceptionGroup is no longer added.

  • trio.TrioInternalError .__cause__ might be wrapped in one or more ExceptionGroups <ExceptionGroup> (#2786)

Features

• Add trio.testing.wait_all_threads_completed, which blocks until no threads are running tasks. This is intended to be used in the same way as trio.testing.wait_all_tasks_blocked. (#2937)

• Path is now a subclass of pathlib.PurePath, allowing it to interoperate with other standard
  pathlib types.

  Instantiating Path now returns a concrete platform-specific subclass, one of PosixPath or
  WindowsPath, matching the behavior of pathlib.Path. (#2959)

Bugfixes

• The pthread functions are now correctly found on systems using vanilla versions of musl libc. (#2939)

Miscellaneous internal changes

• use the regular readme for the PyPI long_description (#2866)