Improves speed by 9 to 10ns per call.

Valgrind isn't seeing PyObject_Free/PyObject_Realloc, but using _PyObject_Free/_PyObject_Realloc works.

The main cause of this bug was fixed as part of bpo-31908.

The __getitem__ methods of DOMEventStream, FileInput,
and FileWrapper classes ignore their 'index' parameters
and return the next item instead.

In the documentation, the `env` directory is specified when we execute
the `make venv` command. But in the code, `make venv` will create the
virtualenv inside the `venv` directory (defined by `VENVDIR`)

Co-authored-by: Antti Haapala <antti.haapala@anttipatterns.com>

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.