[3.7] bpo-36492: Fix passing special keyword arguments to some functions. (GH-12637) (GH-12645)
The following arguments can be passed as keyword arguments for passing
to other function if the corresponding required argument is passed as
positional:
- "func" in functools.partialmethod(), weakref.finalize(),
profile.Profile.runcall(), cProfile.Profile.runcall(),
bdb.Bdb.runcall(), trace.Trace.runfunc() and
curses.wrapper().
- "function" in unittest.addModuleCleanup() and
unittest.TestCase.addCleanup().
- "fn" in the submit() method of concurrent.futures.ThreadPoolExecutor
and concurrent.futures.ProcessPoolExecutor.
- "callback" in contextlib.ExitStack.callback(),
contextlib.AsyncExitStack.callback() and
contextlib.AsyncExitStack.push_async_callback().
- "c" and "typeid" in multiprocessing.managers.Server.create().
- "obj" in weakref.finalize().
(cherry picked from commit 42a139ed88c487f325a241c6ee8b308b3c045975)
diff --git a/Lib/weakref.py b/Lib/weakref.py
index 753f072..59b3aa5 100644
--- a/Lib/weakref.py
+++ b/Lib/weakref.py
@@ -527,7 +527,27 @@
class _Info:
__slots__ = ("weakref", "func", "args", "kwargs", "atexit", "index")
- def __init__(self, obj, func, *args, **kwargs):
+ def __init__(*args, **kwargs):
+ if len(args) >= 3:
+ self, obj, func, *args = args
+ elif not args:
+ raise TypeError("descriptor '__init__' of 'finalize' object "
+ "needs an argument")
+ else:
+ if 'func' not in kwargs:
+ raise TypeError('finalize expected at least 2 positional '
+ 'arguments, got %d' % (len(args)-1))
+ func = kwargs.pop('func')
+ if len(args) >= 2:
+ self, obj, *args = args
+ else:
+ if 'obj' not in kwargs:
+ raise TypeError('finalize expected at least 2 positional '
+ 'arguments, got %d' % (len(args)-1))
+ obj = kwargs.pop('obj')
+ self, *args = args
+ args = tuple(args)
+
if not self._registered_with_atexit:
# We may register the exit function more than once because
# of a thread race, but that is harmless