To create a subunit test stream:
python -m subunit.run discover -t ./ --list
To list it for humans:
python -m subunit.run discover -t ./ --list | subunit-ls --exists
This will produce a subunit stream. Now pipe it to the filter:
python -m subunit.run discover -t ./ --list | python sufilter.py EXCL_LIST LOGFILE
Where EXCL_LIST is a text file containing unwanted test ids, one per line,
LOGFILE is a file that will be used to log the actions.