[Python-ideas] list.index() extension

[Benjamin Peterson]

Greg Ewing <greg.ewing at ...> writes:

> 
> Christian Heimes wrote:
> 
> >>def index(self, obj, predicate=operator.eq):
> >>    for idx, item in enumerate(self):
> >>        if predicate(item, obj):
> >>            return idx
> >>    raise IndexError
> 
> This looks more like it belongs in the itertools module,
> if there isn't something there already that does it.

There's `next(itertools.ifilter(some_list, lambda x: x is my_obj))`, but that
returns the object and not the index as I want.