is there a better way to check an array?

[Wojciech Mula]

jdonnell wrote:
> I want to check if a value is in an array. I'm currently doing it as
> follows, but I just don't like this way of doing it. It seems
> unpythonic.
> 
> fieldIsRequired = true
> try:
>     notRequiredAry.index(k)
>     fieldIsRequired = false
> except ValueError:
>     pass
> 
> # throw expception if field is required and is empty
> if(product[k] == '' and fieldIsRequired):
>     raise GMError(k + ' is required')

if product[k] == '' and k in notRequiredAry:
	raise GMError(k + ' is required')