Try "gunicorn --logger-class mylogger.MyLogger mylogger:app" for both cases: Exhibit A and Exhibit B. Also observe that when you do "python mylogger.py" you will get "AttributeError: 'module' object has no attribute 'glogging'" in the case of Exhibit A.

mylogger.py

if True:
    import gunicorn # Exhibit A
else:
    import gunicorn.glogging # Exhibit B

class MyLogger(gunicorn.glogging.Logger):
    pass

def app(environ, start_response):
    data = "Hello, World!\n"
    start_response("200 OK", [("Content-Type", "text/plain"),
                              ("Content-Length", str(len(data)))])
    yield data