logging.py 文件源码

def _get_logger_for_contextmanager(log):
    """Get the canonical logger from a context manager.

    Parameters
    ----------
    log : Logger or None
        The explicit logger passed to the context manager.

    Returns
    -------
    log : Logger
        The logger to use in the context manager.
    """
    if log is not None:
        return log

    # We need to walk up through the context manager, then through
    # @contextmanager and finally into the top level calling frame.
    return _logger_for_frame(_getframe(3))