old_contents: 
  from clusto.drivers.base import Driver
  
  class Location(Driver):
  
      _clusto_type = "location"
      _driver_name = "location"
  
  
  
new_contents: 
  from clusto.drivers.base import Driver
  
  class Location(Driver):
  
      _clusto_type = "location"
      _driver_name = "location"
  
      def insert(self, thing):
          """Insert the given Enity or Driver into this Entity.
  
          Such that:
  
          >>> A.insert(B)
          >>> (B in A)
          True
  
          A given entity can only be in one Location one time.
          """
  
          d = self.ensure_driver(thing,
                                 "Can only insert an Entity or a Driver. "
                                 "Tried to insert %s." % str(type(thing)))
  
          locations = thing.parents(clusto_drivers=[self._driver_name])
          if locations:
              raise TypeError("%s is already in location(s) %s." %
                                  (thing, locations))
  
          self.add_attr("_contains", d, number=True)
  
subject: add Location.insert() instead of using inherited Driver.insert()