code: def omit_wells(self, uwis=None):
          
          if uwis is None:
              raise ValueError('Must specify at least one uwi')
          return Project([w for w in self if w.uwi not in uwis])
docs: Returns a new project where wells with specified uwis have been omitted
  
          Args: 
              uwis (list): list or tuple of UWI strings.
  
          Returns: 
              project