code: def get_well(self, uwi):
          
          if uwi is None:
              raise ValueError('a UWI must be provided')
          matching_wells = [w for w in self if w.uwi == uwi]
          return matching_wells[0] if len(matching_wells) >= 1 else None
docs: Returns a Well object identified by UWI
  
          Args:
              uwi (string): the UWI string for the well.
          
          Returns:
              well