best way to do this ...

[Tonino]

Hi ALL,

I am having a issue with a particular storage of data problem and
wanted to know if I am going about it the wrong way.

I have a list of reference numbers associated with a product and I have
a socket that listens on a port.  Now what happens is the client app
connects to the server - sends the product and the associated ref
numbers (there are a few per product). I need to be able to store these
in a data  structure so that when the same product is called again  -
it can display the ref numbers for that product.

I am new to OO programming - so please have mercy ;)

eg:


class ProductData:
    def __init__(self,prod):
        self.prod = prod
        self.ref = []
    def add_ref(self,refno):
        self.ref.append(refno)
    def __str__(self):
        return "%s : %s" % (self.prod,",".join(self.ref))


products = ['table', 'chair', 'couch']
ref_numbers = ['1234','4567', '7890']

detail = {}
id = 0

for p in products:
    detail[id] = ProductData(p)
    for r in ref_numbers:
        detail[id].add_ref(r)
    id = id + 1

for a in detail:
    print detail[a]


so I will get:

table : 1234,4567,7890
chair : 1234,4567,7890
couch : 1234,4567,7890

BUT I will need to be able to have this in a while loop - as there is a
socket listener there.

I keep getting this error:

    for a in Detail:
RuntimeError: dictionary changed size during iteration


any ideas ?

Thanks
Tonino

what I want to be able to get is a dict of the products and associated