[Tutor] Iterating over multiple lists- options

Alan Gauld alan.gauld at freenet.co.uk
Mon Feb 7 20:56:41 CET 2005

> How about using a try loop every time you read from
> the list.

try is not a loop.

> try:
>    x=list[someno]
> except:
>    x=nothing(or whatever)
> This goes on till the all lists start returning none.

No, sorry it just does it once.
try/except is for detecting errors not a looping construct.

> for shorter lists try throws an index out of range
> exception which is caught by except.

This much is true. But to do as you suggest the try/except 
would need to be placed inside a for or while loop. However 
that would be an interesting approach. I don't know if it 
would be faster than comparing the len(), I suspect not, 
but try/except is fairly fast so it just might be.

Alan G.

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