Signed-off-by: Anders Kaseorg <anders@zulip.com>
Generated by `pyupgrade --py3-plus --keep-percent-format` on all our Python code except `zthumbor` and `zulip-ec2-configure-interfaces`, followed by manual indentation fixes. Signed-off-by: Anders Kaseorg <anders@zulipchat.com>
This takes advantage of all of our work on making the python-social-auth integration reusable for other authentication backends.