problem with lists

[Greg Fortune]

Uwe Schmitt wrote:

> Sean 'Shaleh' Perry <shalehperry at attbi.com> wrote:
>>>     Manuel
> 
>> You want to use :
> 
>> if fields[3:4] not in domains:
>>    domains.append(fields[3:4])
> 
>> .index() only works if the item is actually in the list.
> 
> At least you should wrap the line with .index in a try/except pair...
> But the solution with "in" is preferable.
> 
> Greetings, Uwe
> 
> 

Or simply use .count instead of a try/except block.

if(domains.count(fields[3:4]) == 0)

will work exactly like 'not in'.  In this case, I would prefer the 'not in' 
option, but wrapping a .index in a try/except seems like a huge overkill.  
IMHO, avoid exceptions if possible.

Greg Fortune
Fortune Solutions