add private method to enum to support replacing global constants with Enum members:
- search for candidate constants via supplied filter
- create new enum class and members
- insert enum class and replace constants with members via supplied module name
- replace __reduce_ex__ with function that returns member name, so previous Python versions can unpickle
modify IntEnum classes to use new method

add private method to enum to support replacing global constants with Enum members:
- search for candidate constants via supplied filter
- create new enum class and members
- insert enum class and replace constants with members via supplied module name
- replace __reduce_ex__ with function that returns member name, so previous Python versions can unpickle
modify IntEnum classes to use new method

Issue #22903: The fake test case created by unittest.loader when it fails importing a test module is now picklable.

Issue #22903: The fake test case created by unittest.loader when it fails importing a test module is now picklable.

broken after converting instance attributes to properies in issue #2211.

available, syscall introduced in the Linux kernel 3.17. It is more reliable
and more secure, because it avoids the need of a file descriptor and waits
until the kernel has enough entropy.

Use a Python source file (linecache.__file__) instead of /etc/passwd.

Modify also linecache docstrings to clarify the linecache is written to cache
Python source files, not any text files.

source files, even if "it works" with other text files encoded to UTF-8.

Use None as a sentinel to stop a worker.

PyMarshal_ReadShortFromFile() can fail.

Detect also earlier PyMarshal_Read*() errors in zipimport.

the caller can replace the directory with a different file kind.

The bottom-up way, os.walk(topdown=False), still uses entry.is_symlink(), and
so can be faster than Python 3.4.

Retry open()/fopen() if it fails with EINTR and the Python signal handler
doesn't raise an exception.

Setting attributes key, value and coded_value directly now is deprecated.
update() and setdefault() now transform and check keys.  Comparing for
equality now takes into account attributes key, value and coded_value.
copy() now returns a Morsel, not a dict.  repr() now contains all attributes.
Optimized checking keys and quoting values.  Added new tests.
Original patch by Demian Brecht.

* If fopen() fails, OSError is raised with the original filename object.
* The GIL is now released while calling fopen()

* _Py_open() now raises exceptions on error. If open() fails, it raises an
  OSError with the filename.
* _Py_open() now releases the GIL while calling open()
* Add _Py_open_noraise() when _Py_open() cannot be used because the GIL is not
  held

Disable completly pyatomic.h on C++, because <stdatomic.h> is not compatible with C++.

<pyatomic.h> is only needed by the optimized PyThreadState_GET() macro in
pystate.h. Instead, declare PyThreadState_GET() as an alias to
PyThreadState_Get(), as done for limited API.

This allows manual selection of a specific unit such as usecs rather than the
use of a heuristic. This is intended to aid machine processing of timeit
output.

Patch by Serhiy Storchaka.

_codecs_cn, _codecs_hk, _codecs_iso2022, _codecs_jp, _codecs_kr and _codecs_tw
modules.

pyexpat.c doesn't need to redeclare PyMODINIT_FUNC, it's already declared in
Include/pyport.h.