def logfile(filename, formatter=None, mode='a', maxBytes=0, backupCount=0, encoding=None, loglevel=None, disableStderrLogger=False):
    """
    Setup logging to file (using a `RotatingFileHandler <https://docs.python.org/2/library/logging.handlers.html#rotatingfilehandler>`_ internally).

    By default, the file grows indefinitely (no rotation). You can use the ``maxBytes`` and
    ``backupCount`` values to allow the file to rollover at a predetermined size. When the
    size is about to be exceeded, the file is closed and a new file is silently opened
    for output. Rollover occurs whenever the current log file is nearly ``maxBytes`` in length;
    if either of ``maxBytes`` or ``backupCount`` is zero, rollover never occurs.

    If ``backupCount`` is non-zero, the system will save old log files by appending the
    extensions ‘.1’, ‘.2’ etc., to the filename. For example, with a ``backupCount`` of 5
    and a base file name of app.log, you would get app.log, app.log.1, app.log.2, up to
    app.log.5. The file being written to is always app.log. When this file is filled,
    it is closed and renamed to app.log.1, and if files app.log.1, app.log.2, etc. exist,
    then they are renamed to app.log.2, app.log.3 etc. respectively.

    :arg string filename: Filename of the logfile. Set to `None` to disable logging to the logfile.
    :arg Formatter formatter: `Python logging Formatter object <https://docs.python.org/2/library/logging.html#formatter-objects>`_ (by default uses the internal LogFormatter).
    :arg string mode: mode to open the file with. Defaults to ``a``
    :arg int maxBytes: Size of the logfile when rollover should occur. Defaults to 0, rollover never occurs.
    :arg int backupCount: Number of backups to keep. Defaults to 0, rollover never occurs.
    :arg string encoding: Used to open the file with that encoding.
    :arg int loglevel: Set a custom loglevel for the file logger, else uses the current global loglevel.
    :arg bool disableStderrLogger: Should the default stderr logger be disabled. Defaults to False.
    """
    # Step 1: If an internal RotatingFileHandler already exists, remove it
    __remove_internal_loggers(logger, disableStderrLogger)

    # Step 2: If wanted, add the RotatingFileHandler now
    if filename:
        rotating_filehandler = RotatingFileHandler(filename, mode=mode, maxBytes=maxBytes, backupCount=backupCount, encoding=encoding)

        # Set internal attributes on this handler
        setattr(rotating_filehandler, LOGZERO_INTERNAL_LOGGER_ATTR, True)
        if loglevel:
            setattr(rotating_filehandler, LOGZERO_INTERNAL_HANDLER_IS_CUSTOM_LOGLEVEL, True)

        # Configure the handler and add it to the logger
        rotating_filehandler.setLevel(loglevel or _loglevel)
        rotating_filehandler.setFormatter(formatter or _formatter or LogFormatter(color=False))
        logger.addHandler(rotating_filehandler)
Setup logging to file (using a `RotatingFileHandler <https://docs.python.org/2/library/logging.handlers.html#rotatingfilehandler>`_ internally).

    By default, the file grows indefinitely (no rotation). You can use the ``maxBytes`` and
    ``backupCount`` values to allow the file to rollover at a predetermined size. When the
    size is about to be exceeded, the file is closed and a new file is silently opened
    for output. Rollover occurs whenever the current log file is nearly ``maxBytes`` in length;
    if either of ``maxBytes`` or ``backupCount`` is zero, rollover never occurs.

    If ``backupCount`` is non-zero, the system will save old log files by appending the
    extensions ‘.1’, ‘.2’ etc., to the filename. For example, with a ``backupCount`` of 5
    and a base file name of app.log, you would get app.log, app.log.1, app.log.2, up to
    app.log.5. The file being written to is always app.log. When this file is filled,
    it is closed and renamed to app.log.1, and if files app.log.1, app.log.2, etc. exist,
    then they are renamed to app.log.2, app.log.3 etc. respectively.

    :arg string filename: Filename of the logfile. Set to `None` to disable logging to the logfile.
    :arg Formatter formatter: `Python logging Formatter object <https://docs.python.org/2/library/logging.html#formatter-objects>`_ (by default uses the internal LogFormatter).
    :arg string mode: mode to open the file with. Defaults to ``a``
    :arg int maxBytes: Size of the logfile when rollover should occur. Defaults to 0, rollover never occurs.
    :arg int backupCount: Number of backups to keep. Defaults to 0, rollover never occurs.
    :arg string encoding: Used to open the file with that encoding.
    :arg int loglevel: Set a custom loglevel for the file logger, else uses the current global loglevel.
    :arg bool disableStderrLogger: Should the default stderr logger be disabled. Defaults to False.