Python "member of" function

Erik Max Francis max at alcyone.com
Sat Apr 29 06:38:11 EDT 2006


brianlum at gmail.com wrote:

> I was wondering if anyone knew of a built in Python function that will
> check if an item is a member of a list, i.e., if item i is a member of
> list l.
> 
> I read of a function "in" but I can't seem to get that to work and
> finding pages for "python in" does not reveal very many relevant
> sources.

Yes, `in` is the relevant operator.  It's quite simple to use:

 >>> a = [1, 4, 9, 16, 25]
 >>> 2 in a
False
 >>> 4 in a
True

If you're having problems using it in some circumstance, you'll have to 
be specific.

-- 
Erik Max Francis && max at alcyone.com && http://www.alcyone.com/max/
San Jose, CA, USA && 37 20 N 121 53 W && AIM erikmaxfrancis
   No man quite believes in any other man.
   -- H.L. Mencken



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