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# pandas.Index.slice_indexer

`Index.``slice_indexer`(start=None, end=None, step=None)

  For an ordered Index, compute the slice indexer for input labels and step

  Parameters : | start : label, default None If None, defaults to the beginning end : label, default None If None, defaults to the end step : int, default None
  Returns : | indexer : ndarray or slice

  Notes

  This function assumes that the data is sorted, so use at your own peril

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