code: def concept(self, cid, **kwargs):
          ''' Get concept by concept ID '''
          if cid not in self.__concept_map:
              if 'default' in kwargs:
                  return kwargs['default']
              else:
                  raise KeyError("Invalid cid")
          else:
              return self.__concept_map[cidf concept(self, cid, **kwargs):
          ''' Get concept by concept ID '''
          if cid not in self.__concept_map:
              if 'default' in kwargs:
                  return kwargs['default']
              else:
                  raise KeyError("Invalid cid")
          else:
              return self.__concept_map[cid]
docs: Get concept by concept ID