code: def distinct(table, key=None, count=None, presorted=False, buffersize=None,
               tempdir=None, cache=True):
      
  
      return DistinctView(table, key=key, count=count, presorted=presorted,
                          buffersize=buffersize, tempdir=tempdir, cache=cache)
docs: Return only distinct rows in the table.
  
      If the `count` argument is not None, it will be used as the name for an
      additional field, and the values of the field will be the number of
      duplicate rows.
  
      If the `key` keyword argument is passed, the comparison is done on the
      given key instead of the full row.
  
      See also :func:`petl.transform.dedup.duplicates`,
      :func:`petl.transform.dedup.unique`,
      :func:`petl.transform.reductions.groupselectfirst`,
      :func:`petl.transform.reductions.groupselectlast`.