See also BaseUserManager.normalize_email -- it uses rsplit.

Refs #4833.

Thanks jose.sanchez et ezeep.com for the report and Vladimir Ulupov
for the initial patch.

Refs #16612. Thanks Aymeric Augustin for the suggestion.

This reverts commit 2babab0b.

Thanks Stefan Koegl for the report and Simon Charette for the review.

Thanks foo@ for the report and Florian Apolloner for the review.

Also:

* Added a ``--no-startup`` option to disable this behavior. Previous
  logic to try to execute the code in charge of this funcionality was
  flawed (it only tried to do so if the user asked for ipython/bpython
  and they weren't found)
* Expand ``~`` in PYTHONSTARTUP value.

Thanks hekevintran at gmail dot com  for the report and initial patch.

Refs #3381.

Thanks charettes.

Thanks Łukasz Rekucki for the report and the patch.

Thanks will@ for the suggestion.

Remove dup_select_related method.

This undocumented method was used in an old version of the admin, is
totally untested and hails from 2008. Although it's listed in the
"public methods" section, as it's not documented or used I don't think
it needs a deprecation path.

If we think it's useful I'll write some tests/docs for it instead...

Thanks epicserve for the suggestion.

Thanks wim@ for the suggestion.

Previous version took about 150ms to source, even on a warm cache,
primarily because it forks+execs /usr/bin/basename 44 times.
This patch makes it faster by a factor of 5 (and I imagine that a little
more thought would reduce the time to effectively zero).

This is needed to support custom user models which don't define a manager
named `objects`.

Shame on me.

Thanks Ricardo di Virgilio for the report, Mateus Gondim for the
patch and Nick Sandford for the review.

Thanks lsaffre for the report. Refs #19325.

The main cleanup was removal of non-necessary __unicode__ method. The
tests didn't break on py3 as the string representation was never used
in the tests.

Refs #17813. Thanks to Simon Charette for spotting this issue.

Refs #17813

Thanks a lot to everybody participating in developing this feature.
The patch was developed by multiple people, at least Trac aliases
tonnzor, jimmysong, Fandekasp and slurms.

Stylistic changes added by committer.

Thanks dpravdin and Jordan Messina.

Thanks grossmanandy at bfusa com and Simon Charette.

The class wasn't used anywhere except in RelatedObject.bind(), which
wasn't used anywhere. The class had one method defined as
NotImplemented, yet the class wasn't subclassed anywhere. In short, the
class was dead code.