_is_label_or_level_reference(self, key: 'str', axis: 'int' = 0) -> 'bool_t'
To be considered either a label or a level reference, :None:None:`key` must be a string that: - (axis=0): Matches a column label or an index level - (axis=1): Matches an index label or a column level
Potential label or level name
Axis that levels are associated with (0 for index, 1 for columns)
Test whether a key is a label or level reference for a given axis.
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