list.index

POYEN OP Olivier (DCL) Olivier.POYEN at clf-dexia.com
Fri Jun 6 15:59:58 CEST 2003



> -----Message d'origine-----
> De : delphiro [mailto:delphiro at zonnet.nl]
> Envoyé : vendredi 6 juin 2003 15:50
> À : python nieuwsgroep
> Objet : list.index
> 

> 
> is this the easiest way to check for the existance of an item 
> in a list?
> it looks a bit weird to check a for a listitem by using a 
> try..except block
> 
> (code background; if the item is found the colour should 
> change else the colour that was already given is ok)
> [mycode]
> try:
>   x = self.selected_points.index( self.pointmarker )
>   colour = DEFAULT_SELECTED_POINT_COLOUR
> except ValueError:
>   pass
> [/mycode]
> 


It seems weird by it's quite ok to do that in python.
AFAIR, I think it's even the purpose of the try/except block.


HTH,

OPQ
 
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