pandas.MultiIndex.is_lexsorted_for_tuple
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MultiIndex.is_lexsorted_for_tuple(tup)[source]
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Return True if we are correctly lexsorted given the passed tuple 
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Licensed under the 3-clause BSD License.
    https://pandas.pydata.org/pandas-docs/version/0.20.3/generated/pandas.MultiIndex.is_lexsorted_for_tuple.html