[Tutor] Finding the Index of a member of a Tuple

[Kent Johnson]

Steve Haley wrote:
> Hello everyone,
>  
> I need to do something very simple but I'm having trouble finding the 
> way to do it - at least easily.  I have created a tuple and now need to 
> find the position of individual members of that tuple.  Specifically, 
> the tuple is something like: words = ("you", "me", "us", "we", "and", 
> "so", "forth") and I need to be able to name a member, for example, "us" 
> and find what the position (index) of that word is in the tuple. 

If you can use a list instead of a tuple you can use the index() method.
  >>> words = ["you", "me", "us", "we", "and", "so", "forth"]
  >>> words.index('me')
1
  >>> words.index('so')
5

There is no index() method for a tuple. This is probably because in 
GvR's view, tuples are analogous to records - they are heterogeneous 
collections where position matters. Lists are for homogeneous 
collections. In this view, tuple.index() doesn't make sense.

list.index() is documented here:
http://docs.python.org/lib/typesseq-mutable.html

You found the right chapter of the Lib Ref but the wrong section.
Kent