def __getitem__(self, k):
if not isinstance(k, (slice,) + integer_types):<EOL><INDENT>raise TypeError<EOL><DEDENT>assert ((not isinstance(k, slice) and (k >= <NUM_LIT:0>))<EOL>or (isinstance(k, slice) and (k.start is None or k.start >= <NUM_LIT:0>)<EOL>and (k.stop is None or k.stop >= <NUM_LIT:0>))),"<STR_LIT>"<EOL>if self._result_cache is None:<EOL><INDENT>len(self)<EOL><DEDENT>return self._result_cache.__getitem__(k)<EOL>
Retrieves an item or slice from the set of results.