pytest cli (aka livelog) filtered output

conftest.py

import pytest, logging, os

class OnlyMe(logging.Filter):
    _only_one = None
    my_path = os.path.dirname(
        os.path.dirname(
            os.path.abspath(__file__)))

    @classmethod
    def scramble_every_zig(cls):
        if cls._only_one is None:
            cls._only_one = cls()
        # logging.root.addFilter can be skipped, it doesn't seem to actually do anything
        # the first handler in logging.root.handlers will be the 
        #   _pytest.logging._LiveLoggingStreamHandler (the output to terminal)
        # the second handler will be the 
        #   _pytest.logging.LogCaptureHandler (the output to the caplog fixture)
        for i in [logging.root] + logging.root.handlers:
            i.addFilter(cls._only_one)

    @classmethod
    def return_zig(cls):
        if cls._only_one is not None:
            for i in [logging.root] + logging.root.handlers:
                i.removeFilter(cls._only_one)

    def filter(self,r):
        return r.pathname.startswith(self.my_path)

# this fixture needs to be used once after the caplog/LiveLog handlers are set up
# trying to simply do this in conftest won't work, it has to be somewhat later
# (livelog/caplog are themselves provided through the fixture interfaces, 
# later than conftest is loaded)
@pytest.fixture
def stfu():
    OnlyMe.scramble_every_zig() # all your base are belong to us!
    yield OnlyMe.my_path # deliever nonsense message to player
    OnlyMe.return_zig() # get us back to our own base

test_something.py

import docker, logging

log = logging.getLogger('something')

def test_something(stfu):
    log.debug("something") # this will emit in the in pytest --log-cli-level debug 
    dc = docker.DockerClient()
    try:
        l = dc.containers.get('something') # docker.auth spams debugs, as does urllib3.connectionpool
        assert l == None                   # but they won't show up here thanks to the stfu fixture
    except docker.errors.NotFound:
        assert True