select.error doesn't have an errno attribute so access the errno by
indexing instead.

(cherry picked from commit e3256087)

(cherry picked from commit e5f7dcce)

(cherry picked from commit 53f91356)

(cherry picked from commit d11e8e0d)

This is more complicated than it should be because we need to preserve the
useful mtime-based regeneration feature that lib2to3.pgen2.driver.load_grammar
has. We only look for the pickled grammar file with pkgutil.get_data and only if
the source file does not exist..
(cherry picked from commit 8a587716)

(cherry picked from commit 83cb778b)

(cherry picked from commit 4f29f3c8)

(cherry picked from commit b748e3b2)

netrc file format doesn't support quotes and escapes.

See https://linux.die.net/man/5/netrc

bpo-32212: Updated logging documentation to make parameter names more consistent with source. (GH-4765) (GH-4768)

(cherry picked from commit a9f8df64)

In fileio, there were 3 fstat() calls and one lseek() call that did not
release the GIL during the call. This can cause all threads to hang for
unlimited time when using io.FileIO with inaccessible NFS server.

Same issue seen in fileio exists also in fileobject, fixed in the same
way.

(cherry picked from commit ae342cf7)

[2.7] bpo-10544: Deprecate "yield" in comprehensions and generator expressions in Py3k mode. (GH-4579) (#4676)

When PyGILState_Ensure() is called in a non-Python thread before
PyEval_InitThreads(), only call PyEval_InitThreads() after calling
PyThreadState_New() to fix a crash.

(cherry picked from commit b4d1e1f7)

Avoid also "cd $(srcdir)" to not change the current directory.

(cherry picked from commit 3be3b97a)

Remove a flakey test and rewrite another one for readability.

(cherry picked from commit cc55e78a)

characters/bytes for non-negative n.  This makes it compatible with
read() methods of other file-like objects.
(cherry picked from commit 219c2de5)

(cherry picked from commit afd055a5)

Mention that the lower the priority number, the higher priority it represents.
(cherry picked from commit 9d5ec808)

The provided code example was supposed to find repeated words, however it returned false results.
(cherry picked from commit 610e5afd)

The paragraph that contains example of string literal concatenation was placed
after the section about concatenation using the '+' sign.
Moved the paragraph to the appropriate section.
(cherry picked from commit 78a5722a)

Move footnote markers to be closer to the related terminology:
before the end of the sentence, instead of after.
(cherry picked from commit cdfe910e)

_PyObject_DebugReallocApi() now calls Py_FatalError() if realloc()
fails to shrink a memory block.

Call Py_FatalError() because _PyObject_DebugReallocApi() erased freed
bytes *before* realloc(), expecting that realloc() *cannot* fail to
shrink a memory block.

* bpo-31324: Optimize support._match_test() (#4421)

* Rename support._match_test() to support.match_test(): make it
  public
* Remove support.match_tests global variable. It is replaced with a
  new support.set_match_tests() function, so match_test() doesn't
  have to check each time if patterns were modified.
* Rewrite match_test(): use different code paths depending on the
  kind of patterns for best performances.
Co-Authored-By: Serhiy Storchaka <storchaka@gmail.com>
(cherry picked from commit 803ddd8c)

* bpo-31324: Fix test.support.set_match_tests(None) (#4505)

(cherry picked from commit bb11c3c9)
(cherry picked from commit 70b2f8797146a56a6880743424f0bedf4fc30c62)

Fix the following warning:

Warning -- files was modified by test_builtin
  Before: []
  After:  ['@test_19422_tmp']
1 test altered the execution environment:
    test_builtin

Replace python3 with python2.

The line number in correct when using the -x option: Py_Main() uses
ungetc() to not skip the first newline character.

(cherry picked from commit 7750bded)

`kargs` -> `kwargs`

(cherry picked from commit b0b44b4b)

* Work around a GC process finalization bug.

The logging RLock instances may exist but the threading.RLock class
itself has already been emptied causing a
Exception TypeError: "'NoneType' object is not callable" in <function _removeHandlerRef ..."
to be printed to stderr on process termination.

This catches that exception and ignores it because there is absolutely
nothing we can or should do about it from the context of a weakref
handler called from the gc context.

[2.7] bpo-31927: Fix reading arbitrary data when parse a AF_BLUETOOTH address (GH-4235) (GH-4352) (#4355)

on NetBSD and DragonFly BSD.
(cherry picked from commit d3187158).
(cherry picked from commit 596286f8f3c8e53ef010d6298464775dc900a515)

select.kevent objects are now comparable with other objects in Python 2.

Define __hash__() in test_functools and test_itertools to fix the
following warning:

DeprecationWarning: Overriding __eq__ blocks inheritance of __hash__ in 3.x