The problem is in the logging.basicConfig(**kwargs):

    <...>
    level = kwargs.get("level")
    if level:
        root.setLevel(level)

So you can not set the level like this, this logger will log WARNING(and
above) instead of all the level:

     logging.basicConfig(level=logging.NOTSET)
     #logging.NOTSET == 0, root default level is WARNING

I have seen this problem was fixed in the trunk, but not in python25 branch:

    level = kwargs.get("level")
    if level is not None:
        root.setLevel(level)

Updated release25-maint.