Creating Custom/Unique Logger-Level for Python

addLoggingLevel.py

def addLoggingLevel(levelName, levelNum, methodName=None):
    """Comprehensively adds a new logging level to the `logging` module and the
    currently configured logging class.

    `levelName` becomes an attribute of the `logging` module with the value
    `levelNum`. `methodName` becomes a convenience method for both `logging`
    itself and the class returned by `logging.getLoggerClass()` (usually just
    `logging.Logger`). If `methodName` is not specified, `levelName.lower()` is
    used.

    To avoid accidental clobberings of existing attributes, this method will
    raise an `AttributeError` if the level name is already an attribute of the
    `logging` module or if the method name is already present 

    Example
    -------
    >>> addLoggingLevel('TRACE', logging.DEBUG - 5)
    >>> logging.getLogger(__name__).setLevel('TRACE')
    >>> logging.getLogger(__name__).trace('that worked')
    >>> logging.trace('so did this')
    >>> logging.TRACE
    5

    References:
        This method was inspired by the answers to Stack Overflow post
        http://stackoverflow.com/q/2183233/2988730, especially
        http://stackoverflow.com/a/13638084/2988730.

    """
    if not methodName:
        methodName = levelName.lower()

    try:
        if hasattr(logging, levelName):
            raise AttributeError('{} already defined in log module'.format(levelName))
        if hasattr(logging, methodName):
            raise AttributeError('{} already defined in log module'.format(methodName))
        if hasattr(logging.getLoggerClass(), methodName):
            raise AttributeError('{} already defined in logger class'.format(methodName))
    except AttributeError as ae:
        logging.warning(ae)
        return

    def logForLevel(self, message, *args, **kwargs):
        if self.isEnabledFor(levelNum):
            self._log(levelNum, message, args, **kwargs)
    def logToRoot(message, *args, **kwargs):
        logging.log(levelNum, message, *args, **kwargs)

    logging.addLevelName(levelNum, levelName)
    setattr(logging, levelName, levelNum)
    setattr(logging.getLoggerClass(), methodName, logForLevel)
    setattr(logging, methodName, logToRoot)