log.py 文件源码

def patch():
    import logging
    from . import format_exception

    logging_format_exception = lambda exc_info: format_exception(*exc_info)

    if hasattr(logging, '_defaultFormatter'):
        logging._defaultFormatter.format_exception = logging_format_exception

    patchables = [handler() for handler in logging._handlerList if isinstance(handler(), StreamHandler)]
    patchables = [handler for handler in patchables if handler.stream == sys.stderr]
    patchables = [handler for handler in patchables if handler.formatter is not None]
    for handler in patchables:
        handler.formatter.formatException = logging_format_exception