code: def pick(self, selector, entity_set, min_quantity=None):
          
          if isinstance(selector, int):
              for e in entity_set:
                  if e.id == selector:
                      return set((e,))
          else:
              if selector.lower() in ('self', 'me', 'myself'):
                  return set((self.entity,))
  
              return set(
                  e for e in entity_set
                  if (e.is_('Named') and selector.lower() in e.Named.name.lower())
                  and not e.is_(Invisible)
                  and (not min_quantity or min_quantity == 1 or (e.is_(Stackable) and e.Stackable.quantity >= min_quantity))
              )
docs: Pick entities from a set by selector. In most cases you should use one
          of the higher-level pick_* functions.