[Tutor] Creating & Handling lots of objects

[Robert, Andrew]

Although I have never done so, I believe you can also store/manipulate
objects in a database.

Has anyone ever worked this option?


Thank you,
Andrew Robert
Systems Architect
Information Technology - OpenVMS
Massachusetts Financial Services
Phone:  617-954-5882
Pager:   781-764-7321
E-mail:  arobert at mfs.com
Linux User Number: #201204

-----Original Message-----
From: tutor-bounces at python.org [mailto:tutor-bounces at python.org] On
Behalf Of Kent Johnson
Sent: Friday, December 03, 2004 7:42 AM
To: Python Tutor
Subject: Re: [Tutor] Creating & Handling lots of objects

If you want to be able to access the objects by name, you can put them
in a dict. For example,
MyObjects={}
l=["a","b","c"]
for i in l:
	MyObjects[i] = MyClass(i)

Then you can refer to MyObjects["a"]

If all the operations on the objects are done to all objects in a batch,
putting them in a list 
might work. Then you can use list iteration to access all of them:
MyObjects=[]
l=["a","b","c"]
for i in l:
	MyObjects.add(MyClass(i))

then to process all the objects:
for myObj in MyObjects:
     # do something with myObj

Kent


Matt Williams wrote:
> Dear Tutor-list,
> 
> I'm sorry for this appallingly dumb question, but I'm having a little
> problem with objects.
> 
> I've written a class, with some methods. I then want to be able to
call
> the class repeatedly, to create some objects. The number of objects,
and
> some of their initialisation parameters need to be specified later
(i.e.
> at run-time).
> 
> When I generate all these objects, how do I keep track of them. For a
> finite (and small) number I can do this:
> 
> a=MyClass("a")
> b=MyClass("b")
> 
> but this is obviously not scaleable. If I use a list, I can do:
> 
> MyObjects=[]
> l=["a","b","c"]
> for i in l:
> 	MyObjects.add(MyClass(i))
> 
> but then I have to search the list (MyObjects) for the object where
> Object.name="a".
> 
> The only other option seems to be finding objects via their hash
codes,
> which I'm sure isn't right
> 
> I'd like to be able to automate something closer to the a=MyClass("a")
> but don't know how to do it....It may be that I'm trying to do it very
> badly, which is Python seems to make it hard for me.
> 
> Thanks,
> 
> Matt
> 
> 
> 
> _______________________________________________
> Tutor maillist  -  Tutor at python.org
> http://mail.python.org/mailman/listinfo/tutor
> 
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"MFS Relay Service" made the following
 annotations on 12/03/2004 08:05:23 AM
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