This issue also affects users of mailman3-web. The warning is issued
when running the hourly cronjob:
$ sudo -u www-data flock -n /var/run/mailman3-web/cron.hourly
/usr/share/mailman3-web/manage.py runjobs hourly
/usr/lib/python3/dist-packages/haystack/backends/whoosh_backend.py:734:
SyntaxWarning: "is" with a literal. Did you mean "=="?
if value is None or len(value) is 0:
/usr/lib/python3/dist-packages/whoosh/codec/whoosh3.py:1116:
SyntaxWarning: "is" with a literal. Did you mean "=="?
elif fixedsize is 0:
Both issues can be fixed by replacing "is" with "==" on the respective
lines.
Imre