In pydoc.py, the reference to Python' documentation was in http.
The link has been updated to use https.
(cherry picked from commit e5681b98)

  one set by the env var PAGER).

  one set by the env var PAGER).

Patch by Sean Rodman, test by Kaushik N.

to format short Python version.

Implementation by Antoine Pitrou.

The concept of .pyo files no longer exists. Now .pyc files have an
optional `opt-` tag which specifies if any extra optimizations beyond
the peepholer were applied.

The previous patch only dealt with KeyboardInterrupt when all of the
data had been consumed by the pager.  This deals with the interrupt
when some data is still pending.

Previously, if you hit ctl-c while the pager was active, the python that
launched the subprocess for the pager would see the KeyboardInterrupt in the
__exit__ method of the subprocess context manager where it was waiting for the
subprocess to complete, ending the wait.  This would leave the pager running,
while the interactive interpreter, after handling the exception by printing
it, would go back to trying to post a prompt...but the pager would generally
have the terminal in raw mode, and in any case would be still trying to read
from stdin.  On some systems, even exiting python at that point would not
restore the terminal mode.  The problem with raw mode could also happen if
ctl-C was hit when pydoc was called from the shell command line and the pager
was active.

Instead, we now wait on the subprocess in a loop, ignoring KeyboardInterrupt
just like the pager does, until the pager actually exits.

(Note: this was a regression relative to python2...in python2 the pager
is called via system, and system does not return until the pager exits.)

shows the help on str.  help('help') now shows the help on help().
Original patch by Mark Lawrence.

differs from file system encoding (e.g. on Mac OS).

Patch by Yuyang Guo and Berker Peksag.

Move Doc/tools/sphinxext content to Doc/tools, there is no need for the nested subdirectory anymore.

Move Doc/tools/sphinxext content to Doc/tools, there is no need for the nested subdirectory anymore.

class name instead of hardcoded one.

Original patch by Amaury Forgeot d'Arc with a test by bdettmer.

Patch by Víctor Terrón.

Along the way, dismantle importlib._bootstrap._SpecMethods as it was
no longer relevant and constructing the new function required
partially dismantling the class anyway.

The 'File objects' section was removed in Python 3.
Patch by Claudiu Popa.

contains characters not encodable to the stdout encoding.

for bound methods.  Previous to this change, it displayed "self" for methods
implemented in Python but not methods implemented in C; it is now both
internally consistent and consistent with inspect.Signature.

for bound methods.  Previous to this change, it displayed "self" for methods
implemented in Python but not methods implemented in C; it is now both
internally consistent and consistent with inspect.Signature.

PyMethodDescr_Type, _PyMethodWrapper_Type, and PyWrapperDescr_Type)
have been modified to provide introspection information for builtins.
Also: many additional Lib, test suite, and Argument Clinic fixes.

Also add missing tests to test_pydoc.

for some builtins.