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# skbio.stats.distance.DissimilarityMatrix.__contains__

`DissimilarityMatrix.``__contains__`(lookup_id)

  Check if the specified ID is in the dissimilarity matrix.

  State: Experimental as of 0.4.0.

  Parameters: | lookup_id (str) – ID to search for.
  Returns: | `True` if lookup_id is in the dissimilarity matrix, `False` otherwise.
  Return type: | bool

  See also

  `index()`