code: def get_sources_by_name(self, name):
          
  
          index_name = name.replace(' ', '').lower()
  
          if index_name in self._src_dict:
              return list(self._src_dict[index_name])
          else:
              raise Exception('No source matching name: ' + name)
docs: Return a list of sources in the ROI matching the given
          name.  The input name string can match any of the strings in
          the names property of the source object.  Case and whitespace
          are ignored when matching name strings.
  
          Parameters
          ----------
          name : str 
  
          Returns
          -------
          srcs : list
             A list of `~fermipy.roi_model.Model` objects.