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Groups > comp.lang.python > #100096

Accessing container's methods

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Hi,

I have a class A, containing embedded embedded classes, which need to 
access methods from A.
.
A highly contrived example, where I'm setting up an outer class in a 
Has-a relationship, containing a number of Actors. The inner class needs 
to access a method of the outer class; here the method get_name.

I don't really want to make Actor a sub-class (is-a; it isn't) of Monty; 
that would raise all sorts of other problems.

Can anyone please advise me on how to achieve this magic?

# define the outer class
class Monty:
   def __init__( self, names ):
     self.actors = []

     i = 0
     for n in names:
       self.actors.append( Actor( n, i ) )
       i += 1	# here is a case for python supporting post-increment!

   def count_actors( self ):
     return len( self.actors )

   def list_actors( self ):
     h=[]
     for n in self.actors:
       h.append( n.get_name() )
     return h

# define the inner class
class Actor:
   def __init__ ( self, name, id ):
     self.name = name
     self.id = id

   def get_name( self ):

     # and here lies the problem;
     # AttributeError: Actor instance has no attribute 'count_actors'
     # how do I access the method in the enclosing class
     txt = "I'm Actor {} Number {} of {}".\
              format(  self.name, self.id, self.count_actors() )

     # this works, of course
     #txt = "I'm Actor \"{}\"; Number {}.  ".\
		format( self.name, self.id )

     return txt

if __name__ == '__main__':
   o = Monty( ["Cleese", "Idle", "Palin" ] )
   print "number: ",o.count_actors()
   a = o.list_actors()
   for l in a:
     print l

Thanks, Tony

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Accessing container's methods Tony van der Hoff <tony@vanderhoff.org> - 2015-12-07 18:10 +0000
  Re: Accessing container's methods Rob Gaddi <rgaddi@highlandtechnology.invalid> - 2015-12-07 18:21 +0000
  Re: Accessing container's methods Michael Torrie <torriem@gmail.com> - 2015-12-07 11:36 -0700
    Re: Accessing container's methods Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2015-12-07 20:03 +0100
  Re: Accessing container's methods Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2015-12-07 19:46 +0100
  Re: Accessing container's methods Peter Otten <__peter__@web.de> - 2015-12-07 19:59 +0100
  Re: Accessing container's methods Ian Kelly <ian.g.kelly@gmail.com> - 2015-12-07 12:33 -0700
  Re: Accessing container's methods Terry Reedy <tjreedy@udel.edu> - 2015-12-07 16:38 -0500
  Re: Accessing container's methods Chris Angelico <rosuav@gmail.com> - 2015-12-08 09:02 +1100
  Re: Accessing container's methods Erik <python@lucidity.plus.com> - 2015-12-07 23:47 +0000
    Re: Accessing container's methods Tony van der Hoff <tony@vanderhoff.org> - 2015-12-08 12:35 +0000
    Re: Accessing container's methods [solved] Tony van der Hoff <tony@vanderhoff.org> - 2015-12-08 13:46 +0000
    Re: Accessing container's methods Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2015-12-08 20:02 +0100
      Re: Accessing container's methods Vincent Vande Vyvre <vincent.vande.vyvre@telenet.be> - 2015-12-08 20:54 +0100
        Re: Accessing container's methods Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2015-12-08 23:51 +0100
      Re: Accessing container's methods Mark Lawrence <breamoreboy@yahoo.co.uk> - 2015-12-08 20:30 +0000
        Re: Accessing container's methods Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2015-12-08 23:52 +0100
          Re: Accessing container's methods Mark Lawrence <breamoreboy@yahoo.co.uk> - 2015-12-08 22:59 +0000
      Re: Accessing container's methods Erik <python@lucidity.plus.com> - 2015-12-08 22:37 +0000
      Re: Accessing container's methods Ian Kelly <ian.g.kelly@gmail.com> - 2015-12-08 16:41 -0700
      Re: Accessing container's methods Chris Angelico <rosuav@gmail.com> - 2015-12-09 12:04 +1100

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