关于python：重新定义自定义异常的正确方法是什么？

What's the proper way to reraise a custom exception?

如果我有这个功能，

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def parse_datetime(s, **kwargs):
""" Converts a time-string into a valid
:py:class:`~datetime.datetime.DateTime` object.

Args:
s (str): string to be formatted.

``**kwargs`` is passed directly to :func:`.dateutil_parser`.

Returns:
:py:class:`~datetime.datetime.DateTime`
"""
if not s:
return None
try:
ret = dateutil_parser(s, **kwargs)
except (OverflowError, TypeError, ValueError) as e:
logger.exception(e, exc_info=True)
raise SyncthingError(*e.args)
return ret

将捕获的异常作为公共库异常引发的最正确方法是什么？ (SyncthingError(Exception))现在它的编写方式无法正常工作。