def __getitem__(self, key, _get_mode=False):
if not _get_mode:
if isinstance(key, integer_types):
return self._list[key]
elif isinstance(key, slice):
return self.__class__(self._list[key])
if not isinstance(key, string_types):
raise exceptions.BadRequestKeyError(key)
ikey = key.lower()
for k, v in self._list:
if k.lower() == ikey:
return v
# micro optimization: if we are in get mode we will catch that
# exception one stack level down so we can raise a standard
# key error instead of our special one.
if _get_mode:
raise KeyError()
raise exceptions.BadRequestKeyError(key)
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