MultiIndex.hasnans = None
MultiIndex.T return the transpose, which is by definition self
MultiIndex.any(other=None)
MultiIndex.dropna(how='any')
MultiIndex.is_monotonic_decreasing return if the index is monotonic decreasing (only equal or decreasing)
MultiIndex.set_labels(labels, level=None, inplace=False, verify_integrity=True)
MultiIndex.repeat(n, *args, **kwargs)
MultiIndex.map(mapper)
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