posixmodule.c always declares environ, so don't bother catching a NameError in os.py.

PyErr_Print() always clears the error indicator, so there is no need
to call PyErr_Clear() immediately afterwards.

Patch by Terry Jan Reedy.

* bpo-34273: Change 'Fixed point' to 'Fixed-point notation'.
The change in the mini language floating point and decimal table
is consistent with 'Exponential notation' and clarifies that we
are referring to the output notation, not an object type.

* Update string.rst

* Update string.rst

* Update string.rst

* Update string.rst

* make CallTip and ToolTip sub-classes of a common abstract base class
* remove ListboxToolTip (unused and ugly)
* greatly increase test coverage
* tested on Windows, Linux and macOS

bpo-34170, bpo-34326: Fix pymain_run_file(): use
PyRun_AnyFileExFlags(closeit=1) instead of calling fclose(fp)
explicitly to close the input file before running the code.

If coerce_c_locale is already set (>= 0), use its value: don't
override it.

When the filesystem doesn't support files with large timestamps,
skip testing that such files can be zipped.

sys_setcheckinterval() now uses a local variable to parse arguments,
before writing into interp->check_interval.

Remove unnecessary "that" in the sentence.

Some MacOS-tk combinations need .update_idletasks().
The call is both unneeded and innocuous on Linux and Windows.
Patch by Kevin Waltzer.

Rephrase it to "It raises a `ValueError`"

Multiprocessing test_timeout() now accepts a delta of 100 ms instead
of just 50 ms, since the test failed with 135.8 ms instead of the
expected 200 ms.

* Inline pymain_run_file() and pymain_open_filename() into
  pymain_run_filename()
* Created pymain_run_stdin() which is pymain_run_filename() with
  filename=NULL
* Rename pymain_run_filename() to pymain_run_file()

In the documentation for the traceback module, the definitions of functions
extract_tb(), format_list() and classmethod StackSummary.from_list()
mention the old style 4-tuples that these functions used to return or accept.

Since Python 3.5, however, they return or accept a FrameSummary object
instead of a 4-tuple, or a StackSummary object instead of a list of 4-tuples.
Co-Authored-By: Berker Peksag <berker.peksag@gmail.com>

ZipFile can zip files older than 1980-01-01 and newer than 2107-12-31 using
a new strict_timestamps parameter at the cost of setting the timestamp
to the limit.

Added missing .grab_release() calls to all places where we call .grab_set().

bpo-31650, bpo-34170: Replace _Py_CheckHashBasedPycsMode with
_PyCoreConfig._check_hash_pycs_mode. Modify PyInit__imp() and
zipimport to get the parameter from the current interpreter core
configuration.

Remove Include/internal/import.h file.

* Add Include/coreconfig.h
* Move config_*() and _PyCoreConfig_*() functions from Modules/main.c
  to a new Python/coreconfig.c file.
* Inline _Py_ReadHashSeed() into config_init_hash_seed()
* Move global configuration variables to coreconfig.c

Fix a memory leak in pymain_init_pycache_prefix()
when PYTHONPYCACHEPREFIX and -X pycache_prefix are used.

Add unit tests for argc and argv of _PyCoreConfig.

* Rename _PyCoreConfig.unbuffered_stdio to buffered_stdio
* Rename _PyCoreConfig.debug to parser_debug

Modify frozenmain.c to use _Py_InitializeFromConfig().

Fix a crash on negative STACKADJ() when Low-Level trace (LLTRACE) is enabled.