which one do you prefer? python with C# or java?

[Terry Reedy]

On 6/15/2012 3:04 PM, Paul Rubin wrote:
> Terry Reedy<tjreedy at udel.edu>  writes:
>> Python iterators can do lazy evaluation. All the builtin classes come
>> with a corresponding iterator. ...
>
> I wouldn't say iterators do lazy evaluation in the Scheme or Haskell
> sense.  Lazy evaluation imho means evaluation is deferred until you
> actually try to use the value, and when you use it, it is computed and
> kept around for later re-use (until it becomes gc-able).  Python
> iterators simply generate one value at a time and leave retention of old
> values to be managed by the programmer.

Ok, I see the difference. You are talking about something like a 
memoized __getitem__  that computes and store values as needed.

>> There is nothing simulated about yield. Python mostly does what you
>> tell it to do. You just have to learn how to tell it to do what you
>> want.
>
> I'd be interested in seeing a clean implementation of that algorithm
> using python iterators.

I already wrote "The problem being discussed may be a case where [linked 
lists] are useful and make it easier to save space" -- because, from 
what I understood, a moving buffer of temporarily saved buffers is needed.

-- 
Terry Jan Reedy