pretty basic instantiation question

[Steve Holden]

Leif K-Brooks wrote:
> sittner at lkb.ens.fr wrote:
> 
>>let's say i have a class, and i need to create a different number of
>>instances (changes every time - and i can't know the number in advance) in
>>a loop.
>>a function receives the number of instances that are needed, and creates
>>them like,
>>a=Myclass()
>>b=Myclass()
> 
> 
> def create_instances(n):
>      return [Myclass() for i in xrange(n)]

Leif's point being you *don't* want to bind a different name to each of 
a variable number of things - that way madness lies, as you end up 
creating Python statements on the fly using eval() and exec and other 
such dangerous and insanity-inducing tricks :-)

Instead use a container structure like a list to hold them, and then use 
an appropriate technique to access them while they are still in the 
container.

regards
  Steve
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