_ensure_key_mapped_multiindex(index: 'MultiIndex', key: 'Callable', level=None) -> 'MultiIndex'
Index to which to apply the key function on the specified levels.
Function that takes an Index and returns an Index of the same shape. This key is applied to each level separately. The name of the level can be used to distinguish different levels for application.
Level or list of levels to apply the key function to. If None, key function is applied to all levels. Other levels are left unchanged.
Resulting MultiIndex with modified levels.
Returns a new MultiIndex in which key has been applied to all levels specified in level (or all levels if level is None). Used for key sorting for MultiIndex.
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