Replace _s with ptr to avoid future confusion. Add also non regression tests.

Patch by Philipp Hagemeister.

Patch by Philipp Hagemeister.

Issue #15502: Bring the importlib.PathFinder docs and docstring more in line with the new import system documentation, and fix various parts of the new docs that weren't quite right given PEP 420 or were otherwise a bit misleading. Also note the key terminology problem still being discussed in the issue

Clarify the import statement semantics, especially for implicit imports in the 'from X import Y' variant

Close #15519: Properly expose WindowsRegistryFinder in importlib and bring the name into line with normal import terminology. Original patch by Eric Snow

Issue #15502: Bring the importlib ABCs into line with the current state of the import protocols given PEP 420. Original patch by Eric Snow.

I suppose that these scripts didn't work since Python 3.0.

if the bytes filenames cannot be encoded from the file system (ANSI) code page

to 500 characters.

Don't exit the tstate is NULL to restore the errno and chain the signal handler
if needed.

Patch by Stefan Krah.

Analysis by Victor Stinner. Patch by Stefan Krah.

Patch from Taihyun Hwang.

Patch by Roger Serwy.

Patch by Roger Serwy.

Issue #14814: reorganize ipaddress documentation and document all attributes of IPv[46]Address objects

Issue #15425: Don't rely on the assumption that the current working directory is on sys.path (this will hopefully appease the XP buildbots)

Close #15486: Simplify the mechanism used to remove importlib frames from tracebacks when they just introduce irrelevant noise

faulthandler requires the importlib if "-X faulthandler" option is present on
the command line, so initialize faulthandler after importlib.

Add also an unit test.

'level' values and set its document default value to 0.

Thanks to Arfrever Frehtes Taifersar Arahesis for filing the bug.