[Answered ]-Sentry-youtrack plugin: PicklingError: Can't pickle <type 'generator'>: attribute lookup __builtin__.generator failed

This is a bug for sentry-youtrack, it should not cache a generator object. python-memcached might have a pyc file, that’s why it did not dump the value like you modified. And you added (i for i in list) which also is a generator.

You should use getsentry/sentry-youtrack since it has the correct fix for caching generator.