Published: 2022-08-09
LookupError
is a base class for IndexError
and KeyError
:
LookupError.__subclasses__()
# [IndexError, KeyError, encodings.CodecRegistryError]
KeyError.mro()
# [KeyError, LookupError, Exception, BaseException, object]
IndexError.mro()
# [IndexError, LookupError, Exception, BaseException, object]
The main purpose of this intermediate exception is to simplify a bit lookup for deeply nested structures when any of these two exceptions may occur:
try:
username = resp['posts'][-1]['authors'][0]['name']
except LookupError:
username = None