Which type should be used when testing static structure appartenance

[Nicolas Évrard]

Hello,

I saw the following retweet by Raymond Hettinger in this morning:

    https://twitter.com/sanityinc/status/666485814214287360

    Programming tip: many of those arrays and hashes in your code
    should actually be sets. Match data structures to data
    constraints!

I saw just in time because in a review I wrote something like this:

    if operator not in ('where', 'not where')

and my colleague proposed that I should use a list instead of a tuple.
But reading the mentioned tweet I tend to think that a set would be a
better choice.

What are your opinion on this issue (I realize it's not something of
the utmost importance but rather a "philosophical" question).

-- 
Nicolas Évrard - B2CK SPRL
E-mail/Jabber: nicolas.evrard at b2ck.com
Tel: +32 472 54 46 59
Website: http://www.b2ck.com/