(original patch by Phil Webster).

* describe how \w is different when used in bytes and Unicode patterns.

* describe re.ASCII flag to change that behaviour.

* remove personal references ('I generally prefer...')

* add some more links to the re module in the library reference

* various small edits and re-wording.

inside subjectAltName correctly. Formerly the module has used OpenSSL's
GENERAL_NAME_print() function to get the string represention of ASN.1
strings for rfc822Name (email), dNSName (DNS) and
uniformResourceIdentifier (URI).

Issue #18756: Improve error reporting in os.urandom() when the failure is due to something else than /dev/urandom not existing.

Patch by Catherine Devlin.

and paired splits and joins that do nothing when output_sep is its default \n.
*It in unused in that the class in only instantiated once, with the default.
Make a few other changes in .fetch and its test.

Remove an unused early-out test from the critical path for
dict and set lookups.

When the strings already have matching lengths, kinds, and hashes,
there is no additional information gained by checking the first
characters (the probability of a mismatch is already known to
be less than 1 in 2**64).

prefix from two attributes and two methods of History class.

Issue #18680: JSONDecoder should document that it raises a ValueError
  for malformed data

docstrings and ValueError messages. Patch by Zhongyue Luo

now working with comment block selections. Patch was part of 18226 patch.