WWW address (http://www.python.org/idle/) mentioned in "About IDLE" dialog window is no longer valid.

For the record, on the legacy web site, that URI (which you can still see as http://legacy.python.org/idle/) redirected to the Python 2 IDLE page in the Standard Library docs:  https://docs.python.org/2/library/idle.html.

I guess a redirect could be added again.

It could but to which page, e.g. which version of the docs?

Should we add /idle3/ redirection for 3.x?

The URI in "About IDLE" is redundant in that the same information on the doc page is also available in text format in the IDLE Help menu and there is also a link there to the full HTML docs.  Perhaps the URI should just be removed from About IDLE going forward; we could still add a redirect for the benefit of IDLEs already released.

Idle's Help system needs a thorough review.  Current issues include 
16893, 21995, 17583, and a few more in my head, including revising About.

In the meanwhile, I am replacing the dead link with 
'https://docs.python.org/' + sys.version[:3] + '/library/idle.html'
(It cannot be copied to be pasted; making it clickable would be part of revising About.)

I suggest redirecting the current dead link http://www.python.org/idle/ to https://docs.python.org/3/library/idle.html.  People can always select a different version from there.

OK, the redirect should now be in place.

New changeset d411dff4e3d4 by Terry Jan Reedy in branch '2.7':
Issue #22632: replace dead link with version-specific doc link.
https://hg.python.org/cpython/rev/d411dff4e3d4

New changeset db5e431125b1 by Terry Jan Reedy in branch '3.4':
Issue #22632: replace dead link with version-specific doc link.
https://hg.python.org/cpython/rev/db5e431125b1

verified