We don't want to go into a full explanation of scopes at this point in the
tutorial, so we just mention that the loop creates or overwrites a persistent
variable while the listcomp doesn't.  Not mentioning this would lead someone
to incorrectly assume loops and listcomps were *completely* equivalent, which
would confuse them later.

Original patch by Rose Ames, tweaked to remove the word 'scope'.

Patch by Francis MB.

Check if the sporadic failure is related to a timeout.
The test just failed on the buildbot "x86 Windows7 3.x": 1 thread done / 20
(the 'done' condition was not signaled because 1 < 20).

Move Doc/tools/sphinxext content to Doc/tools, there is no need for the nested subdirectory anymore.

Move Doc/tools/sphinxext content to Doc/tools, there is no need for the nested subdirectory anymore.

Issue #18711: Add a new `PyErr_FormatV` function, similar to `PyErr_Format` but accepting a `va_list` argument.

remove delayed calls that were cancelled.

calls that were cancelled.

Remove pointless "vile hack" that can cause the build step to fail when some extension modules can't be imported.

See issue #5309 for the build failures, issue #458343 for the original motivation.

_read_null(), because _read_null() cannot be used on AIX. On AIX, reading from
NULL is allowed: the first page of memory is a mapped read-only on AIX.

_read_null() and _sigabrt() don't accept parameters.

because _read_null() cannot be used on AIX. On AIX, reading from NULL is
allowed: the first page of memory is a mapped read-only on AIX.

crash.

os.posix_fadvise() nor os.posix_fallocate() because their prototypes in system
headers are wrong.

os.posix_fallocate() because their prototypes in system headers are wrong.

-Wsign-compare warnings in unicodeobject.c.  These were all a result
of sizeof() being unsigned and being compared to a Py_ssize_t.
Not actual problems.

From Robert Collins.