Tuple question

[Jason Lai]

Dan Christensen wrote:
> I'm not sure I buy the arguments against an index operation for
> tuples.  For example, suppose we were conducting a vote about
> something, hmm, let's say decorator syntax.  <wink>  And suppose that
> each person is allowed three distinct votes, ranked in order, with the
> first vote getting 3 points, the second 2, and the third 1.  We might
> store the votes in a database, whose rows would naturally be tuples
> like
> 
>   ('J2', 'C64', 'X11')
> 
> Now suppose we want to calculate the total number of points for
> proposal X, but don't need to compute the totals for the other
> choices.  Code like the following would be a pretty natural
> approach:
> 
>     for row in rows:
>         try:
>             points += 3-row.index(X)
>         except:
>             pass
> 
> I realize that there are different ways to code it, but most
> are simply reimplementations of the proposed index function.
> 
> Dan

Well,

for index, row in enumerate(rows):
     points += 3 - i

It's not really reimplementing the index function. You already have the 
index. I think for most of the cases where people use tuples, you 
already know what you're using each index for.

  - Jason