pandas.TimedeltaIndex.get_indexer_non_unique

TimedeltaIndex.get_indexer_non_unique(target)

return an indexer suitable for taking from a non unique index return the labels in the same order as the target, and return a missing indexer into the target (missing are marked as -1 in the indexer); target must be an iterable

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https://pandas.pydata.org/pandas-docs/version/0.18.1/generated/pandas.TimedeltaIndex.get_indexer_non_unique.html