Patch from Armin Rigo.

Patch by Matti Picus.

Further explanation of the concept stands alone without this reference,
no need to potentially confuse people by bringing up a feature that
doesn't exist.

copy of libz exists in $HOME/lib or /usr/local/lib.

non-framework builds and for all variants of Tk.

to parse more than one XML document per pyexpat xmlparser instance.
(Original patches by Hirokazu Yamamoto and Amaury Forgeot d'Arc, with
suggested wording by David Gutteridge)

failures when ssl is not present.

Previously a non-string, non-regex second argument and no callable
argument could cause the test to appear to always pass.

Remove useless test and unused variables. Initial patch by Andreas Schwab.

Closes #18456: Doc fix: PyDict_Update only works with dict-like objects, not key-value sequences. Patch by priyapappachan.

close the file descriptor if os.fdopen() fails

Suggested by Bruce Esrig on docs@.