Fixed an output of sets in examples.

Add an entry in the language datamodel special methods section.
Revise and index its discussion in the stdtypes mapping/dict section.

is run with pythonw.exe.

is run with pythonw.exe.

Patch by Chaitanya Agrawal.

An exception handler assumed that that OSError objects always have a
'winerror' attribute. That is not the case, so the exception handler
itself raised AttributeError when run on Linux (and, presumably, any
other non-Windows OS).

Patch by Greg Ward.

An exception handler assumed that that OSError objects always have a
'winerror' attribute. That is not the case, so the exception handler
itself raised AttributeError when run on Linux (and, presumably, any
other non-Windows OS).

Patch by Greg Ward.

Patch by Ezio Melotti.

Patch by Éric Araujo.

Patch by Éric Araujo.

Issue #1218234. Initial patch by Berker Peksag.

Issue #1218234. Initial patch by Berker Peksag.

Closes issue #23009.

Closes issue #23009.

HTTPSConnection: prefer the context's check_hostname attribute over the constructor parameter (#22959)