Fix a bug that can cause a crash when sub-interpreters use "basic"
single-phase extension modules. Shared objects could refer to PyGC_Head
nodes that had been freed as part of interpreter shutdown.
Co-authored-by: C.A.M. Gerlach <CAM.Gerlach@Gerlach.CAM>
Co-authored-by: Adam Turner <9087854+AA-Turner@users.noreply.github.com>
Co-authored-by: Hugo van Kemenade <1324225+hugovk@users.noreply.github.com>
Change the default multiprocessing start method away from fork to forkserver or spawn on the remaining platforms where it was fork. See the issue for context. This makes the default far more thread safe (other than for people spawning threads at import time... - don't do that!).
Co-authored-by: blurb-it[bot] <43283697+blurb-it[bot]@users.noreply.github.com>
Co-authored-by: Hugo van Kemenade <1324225+hugovk@users.noreply.github.com>
To recap: the objective is to make starred expressions valid in `subscription`,
which is used for generics: `Generic[...]`, `list[...]`, etc.
What _is_ gramatically valid in such contexts? Seemingly any of the following.
(At least, none of the following throw `SyntaxError` in a 3.12.3 REPL.)
Generic[x]
Generic[*x]
Generic[*x, y]
Generic[y, *x]
Generic[x := 1]
Generic[x := 1, y := 2]
So introducting
flexible_expression: expression | assignment_expression | starred_item
end then switching `subscription` to use `flexible_expression` sorts that.
But then we need to field `yield` - for which any of the following are
apparently valid:
yield x
yield x,
yield x, y
yield *x,
yield *x, *y
Introducing a separate `yield_list` is the simplest way I've been figure out to
do this - separating out the special case of `starred_item ,`.
Co-authored-by: Jelle Zijlstra <jelle.zijlstra@gmail.com>
* The module state now stores a strong reference to the Placeholder
singleton.
* Use a regular dealloc function.
* Add Py_TPFLAGS_HAVE_GC flag and a traverse function to help the GC
to collect the type when a _functools extension is unloaded.
* Reduce the number of iterations and the number of threads so a
whole test file takes less than a minute.
* Refactor test_racing_iter_extend() to remove two levels of
indentation.
* test_monitoring() uses a sleep of 100 ms instead of 1 second.
Using a standard library class makes this test difficult to maintain
as other tests and other parts of the stdlib may create subclasses,
which may still be alive when this test runs depending on GC timing.
* For-else deserves its own section in the tutorial
* remove mention of unrolling the loop
* Update Doc/tutorial/controlflow.rst
Co-authored-by: Jelle Zijlstra <jelle.zijlstra@gmail.com>
---------
Co-authored-by: Jelle Zijlstra <jelle.zijlstra@gmail.com>
Raymond Hettinger
Petr Viktorin
Tony Roberts
Russell Keith-Magee
Alex Waygood
Brandt Bucher
sobolevn
Malcolm Smith
Jelle Zijlstra
Max Bachmann
Ned Batchelder
Erlend E. Aasland
Neil Schemenauer
Savannah Ostrowski
Hugo van Kemenade
Gregory P. Smith
Dino Viehland
Brett Cannon
Bénédikt Tran
Donghee Na
Matthew Rahtz
Tian Gao
neonene
Adam Turner
Kirill Podoprigora
Victor Stinner
Tomas R
Sergey B Kirpichev
Peter Bierma
Ron Frederick
Jason Fried
dgpb
larryhastings