> 1. I need to find the sum of all numbers at even positions in the
> Fibonacci series upto 2 million.
>
> 2. I have used lists to achieve this.
I see. You may want to produce a "sequence" or "iterator" of
fibonacci numbers rather than an explicit list. As it is, your
machine does not have enough physical memory to hold the whole
sequence at once.
Python has a "generator" language feature that supports a style of
programming on infinite sequences. You can find an introduction to
Python generators here:
http://linuxgazette.net/100/pramode.html
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