_get_label_or_level_values(self, key: 'str', axis: 'int' = 0) -> 'np.ndarray'
Retrieval logic:
(axis=0): Return column values if :None:None:`key` matches a column label. Otherwise return index level values if :None:None:`key` matches an index level.
(axis=1): Return row values if :None:None:`key` matches an index label. Otherwise return column level values if 'key' matches a column level
Label or level name.
Axis that levels are associated with (0 for index, 1 for columns)
if :None:None:`key` matches neither a label nor a level
if :None:None:`key` matches multiple labels
if :None:None:`key` is ambiguous. This will become an ambiguity error in a future version
Return a 1-D array of values associated with :None:None:`key`, a label or level from the given :None:None:`axis`.
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