Loggers

A logger is the main entry point of the logging library, allowing you to define top-level behavior.

import logging

List all loggers

It’s usefull to acesss all loggers available now. All loogets defined in the cureent interprier state is defined in the logging.Logger.manager.loggerDict.

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The following cell demonstrates how loggerDict looks like for the current jupyter notebook.

logging.Logger.manager.loggerDict

{'concurrent.futures': <Logger concurrent.futures (WARNING)>,
 'concurrent': <logging.PlaceHolder at 0x77013bedf040>,
 'asyncio': <Logger asyncio (WARNING)>,
 'tornado.access': <Logger tornado.access (WARNING)>,
 'tornado': <Logger tornado (WARNING)>,
 'tornado.application': <Logger tornado.application (WARNING)>,
 'tornado.general': <Logger tornado.general (WARNING)>,
 'stack_data.serializing': <Logger stack_data.serializing (WARNING)>,
 'stack_data': <logging.PlaceHolder at 0x77013ad56fe0>,
 'parso': <Logger parso (WARNING)>,
 'prompt_toolkit.buffer': <Logger prompt_toolkit.buffer (WARNING)>,
 'prompt_toolkit': <logging.PlaceHolder at 0x77013a970d60>,
 'parso.python.diff': <Logger parso.python.diff (WARNING)>,
 'parso.python': <logging.PlaceHolder at 0x77013a3eb040>,
 'parso.cache': <Logger parso.cache (WARNING)>,
 'Comm': <Logger Comm (WARNING)>,
 'ipykernel.comm': <Logger ipykernel.comm (WARNING)>,
 'ipykernel': <logging.PlaceHolder at 0x770139edcaf0>,
 'IPKernelApp': <Logger IPKernelApp (DEBUG)>}

Disable

Some loggers can be disabled. A logger is disabled if it’s disabled property takes the value false.

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The following example shows how created logger can be disabled.

logger = logging.getLogger("disable_test_logger")
logger.warning("beep")
logger.disabled = True
logger.warning("beep")
logger.disabled = False

beep

Even though we run the looger.warning("beep") command twice, there is only one beep message because we just set disabled=True before the second beep.