a small problem

[Justin Sheehy]

knotwell at my-deja.com writes:

> Is the following a bug?
> 
> >>> q = [(1,'dd'),(2,'ddd'),(3,'ddddd')]
> 
> >>> reduce(lambda x,y: x[0] + y[0],q)
> 
> Traceback (innermost last):
>   File "<stdin>", line 1, in ?
>   File "<stdin>", line 1, in <lambda>
> AttributeError: __getitem__

If you expand the reduce call, the problem becomes obvious:

((1,'dd')[0] + (2,'ddd')[0])[0] + (3,'ddddd')[0]

In the first step, you do (1,'dd')[0] + (2,'ddd')[0], which is fine.
It evaluates to the integer 3.

The next step, you do 3[0] + (3,'ddddd')[0], which will fail because
the result of the previous step (3) cannot be subscripted.

-Justin