python - Link two classes together by variables -

i learning python couple different books learn python hard way.

i trying better understand classes , ran example :

class dog(object):      def __init__(self, name):           self.name = name           self.legs = 4           self.carry_weight = 0  class person(object):       def __init__(self,name):           self.name = name           self.pet = none           self.weight = 0   rover = dog("rover") rover.carry_weight = 180 frank.pet = rover print frank.name print frank.pet.legs  if frank.weight < frank.pet.carry_weight: print "yes, frank can ride dog %s around neighborhood" % frank.pet.name 

so learned can link 2 instances of class , call attributes 1 other. wanted add attribute

owner = none 

under dog. , when link frank rover links rover frank owner if know rover can pull frank.

what have come idea:

def assign_pet(self, petsname):      self.pet = petsname      petsname.owner = self.name 

this seems work fine wanted know if best way go this. there better way?

i don't know programs , don't have anywhere go questions. tried search answer feel 1 of 3 blind men feeling elephant, 1 moment im googling "whats rope thing hangs 7 feet off ground" , next i'm googling "whats tree trunk stomped on face". hope guys understood joke. hard search can't describe properly.