The setobject freelist was consuming memory but not providing much value.
Even when a freelisted setobject was available, most of the setobject
fields still needed to be initialized and the small table still required
a memset().  This meant that the custom freelisting scheme for sets was
providing almost no incremental benefit over the default Python freelist
scheme used by _PyObject_Malloc() in Objects/obmalloc.c.

test_is_alive_after_fork is failing on some old Linux kernels, but
passing on all newer ones.  Since virtually anything can go wrong
with locks when mixing threads with fork, replace the most likely
cause with a redundant simple data member.

When test.support was converted to a package, it started silently
skipping the tests which needed to download support data to run.

This change refactors the affected code, and also tidies up
test.support.findfile to remove the unused *here* parameter, document
the *subdir* parameter and rename the *filename* parameter to avoid
shadowing the file builtin and be consistent with the documentation.

The unexpected skips were noticed and reported by Zachary Ware

Correct Profile class usage example. Addresses issue #18033.
Patch contributed by Olivier Hervieu and Dmi Baranov.

Patch contributed by Olivier Hervieu and Dmi Baranov.

Issue #18808: Thread.join() now waits for the underlying thread state to be destroyed before returning.
This prevents unpredictable aborts in Py_EndInterpreter() when some non-daemon threads are still running.

Fix License URL display and add test to check for license url presence.
Fixes issue #18206 Patch contributed by  Berker Peksag and py.user

Fixes issue #18206 Patch contributed by  Berker Peksag and py.user

Removing the mention of os.isatty mention as Unix only
Correct the wrong documentation.

Correct the wrong documentation.

Patch written by Vajrasky Kok.

emulation has changed from 0-based indexing to 1-based like gnu readline.
Original patch by Ronald Oussoren.

Issue 18944:  fix a 1-character typo in test_set.py.

The error caused test_inline_methods() to test much less than intended.
Caught (& fixed) by Armin Rigo.

The error caused test_inline_methods() to test much less than intended.
Caught (& fixed) by Armin Rigo.

want to check that Connection.poll() doesn't crash.

Patch by Valerie Lambert.

Patch by Berker Peksag.

output to stdout, matching the 'python -v'

Reported by Wolfgang Maier

existing directory caused mkstemp and related APIs to fail instead of
retrying. Report and fix by Vlad Shcherbina.

existing directory caused mkstemp and related APIs to fail instead of
retrying. Report and fix by Vlad Shcherbina.