[Python-ideas] Function to return first(or last) true value from list

[Oscar Benjamin]

On 20 February 2014 23:51, Steven D'Aprano <steve at pearwood.info> wrote:
>
> IndexError can also be caught by for-loops, under some circumstances.
> (See the legacy sequence protocol for iteration.)

Only if your code is actually using the legacy sequence protocol:

>>> def f(): yield 2; raise IndexError
...
>>> for x in f():
...     print(x)
...
2
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "<stdin>", line 1, in f
IndexError


Oscar