By setting the PYTHONDEVMODE env flag we can run python in development mode which will enable multiple warnings including deprecation warnings.

Using development mode on our python tests with
PYTHONDEVMODE=1 python3 test/suite/run.py -j $(nproc)

results in a handful of warnings including:

DeprecationWarning: isSet() is deprecated, use is_set() instead while not self.done.isSet(): 

and

DeprecationWarning: Please use assertEqual instead. self.assertEquals(cursor.next(), wiredtiger.WT_NOTFOUND) 

We should fix these warnings such that running the command listed above doesn't yield any output.