MultiIndex.droplevel(level=0)
MultiIndex.transpose(*args, **kwargs)
MultiIndex.is_boolean()
MultiIndex.dtype = None
MultiIndex.reorder_levels(order)
MultiIndex.unique()
MultiIndex.size return the number of elements in the underlying data
MultiIndex.sym_diff(*args, **kwargs)
MultiIndex.difference(other)
MultiIndex.summary(name=None)
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