raise-missing-from / W0707

Message emitted:

Consider explicitly re-raising using the 'from' keyword

Description:

Python 3's exception chaining means it shows the traceback of the current exception, but also the original exception. Not using `raise from` makes the traceback inaccurate, because the message implies there is a bug in the exception-handling code itself, which is a separate situation than wrapping an exception.

Created by exceptions checker