logging behaviour

import logging
from logging import config

ON_LOGGERS = True
config.dictConfig({
    'version': 1,
    'formatters': {
        'fmt_root':    {'format': '[ /        ] - %(levelname)s - %(name)s - %(message)s'},
        'fmt_pkg':     {'format': '[ /pkg     ] - %(levelname)s - %(name)s - %(message)s'},
        'fmt_pkg_sub': {'format': '[ /pkg/sub ] - %(levelname)s - %(name)s - %(message)s'},
    },
    'handlers': {
        'hnd_root': {
            'class': 'logging.StreamHandler',
            'level': logging.DEBUG,
            'stream': 'ext://sys.stdout',
            'formatter': 'fmt_root',
        },
        'hnd_pkg': {
            'class': 'logging.StreamHandler',
            'level': logging.DEBUG if ON_LOGGERS else logging.WARNING,
            'stream': 'ext://sys.stdout',
            'formatter': 'fmt_pkg',
        },
        'hnd_pkg_sub': {
            'class': 'logging.StreamHandler',
            'level': logging.DEBUG if ON_LOGGERS else logging.INFO,
            'stream': 'ext://sys.stdout',
            'formatter': 'fmt_pkg_sub',
        },
    },
    'root': {
        'handlers': ['hnd_root'],
        'level': logging.DEBUG,
    },
    'loggers': {
        'pkg': {
            'handlers': ['hnd_pkg'],
            'level': logging.WARNING if ON_LOGGERS else logging.DEBUG,
            'propagate': True,
        },
        'pkg.sub': {
            'handlers': ['hnd_pkg_sub'],
            'level': logging.INFO if ON_LOGGERS else logging.DEBUG,
            'propagate': True,
        },
    },
})

logging.getLogger().info('message 1')
logging.getLogger('pkg').info('message 2')
logging.getLogger('pkg.sub').info('message 3')