Remove deprecated methods since Python 3.3.
Moreover nntplib.NNTP.xgtitle has not been exposed through docs.python.org
https://docs.python.org/3/library/nntplib.html

I'm not used to the NNTP protocol. Does the news.gmane.io support these 2 extensions?

Looks like xgtitle is supported but xpath is not.

>>> a.xgtitle('gmane.comp.python.committers')
('282 Descriptions in form "group description"', [('gmane.comp.python.committers', 'CPython Committers (non-public) (Moderated)')])
>>> a.xpath(message_id)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/nntplib.py", line 865, in xpath
    resp = self._shortcmd('XPATH {0}'.format(id))
  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/nntplib.py", line 513, in _shortcmd
    return self._getresp()
  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/nntplib.py", line 458, in _getresp
    raise NNTPPermanentError(resp)
nntplib.NNTPPermanentError: 500 What?

>>> a.xgtitle('gmane.comp.python.committers')
('282 Descriptions in form "group description"', [('gmane.comp.python.committers', 'CPython Committers (non-public) (Moderated)')])

Does https://docs.python.org/dev/library/nntplib.html#nntplib.NNTP.description give the same result?

> Does https://docs.python.org/dev/library/nntplib.html#nntplib.NNTP.description give the same result?

Not exactly same but descriptions give a similar result.

>>> import nntplib
>>> a = nntplib.NNTP('news.gmane.io')
>>> a.description('gmane.comp.python.committers')
'CPython Committers (non-public) (Moderated)'
>>> a.descriptions('gmane.comp.python.committers')
('215 Newsgroup descriptions in form "group description"', {'gmane.comp.python.committers': 'CPython Committers (non-public) (Moderated)'})
>>> a.xgtitle('gmane.comp.python.committers')
<stdin>:1: DeprecationWarning: The XGTITLE extension is not actively used, use descriptions() instead
('282 Descriptions in form "group description"', [('gmane.comp.python.committers', 'CPython Committers (non-public) (Moderated)')])

>>> a.description('gmane.comp.python.committers')
'CPython Committers (non-public) (Moderated)'
>>> a.descriptions('gmane.comp.python.committers')
('215 Newsgroup descriptions in form "group description"', {'gmane.comp.python.committers': 'CPython Committers (non-public) (Moderated)'})

Well, both results contain the same important string: 'CPython Committers (non-public) (Moderated)'. So I think that it's ok to drop xgtitle() as well.

New changeset 1f0f102dec506fd06f912b74dd2be64a7fba0d3f by Berker Peksag (Dong-hee Na) in branch 'master':
bpo-39366: Remove xpath() and xgtitle() methods of NNTP (GH-18035)
https://github.com/python/cpython/commit/1f0f102dec506fd06f912b74dd2be64a7fba0d3f

Thanks for the PR! I'm glad these previously deprecated functions are now gone.