reversed(enumerate(x))

[Brendan Abel]

You could create your own generator that wraps enumerate

def reverse_enumerate(iterable):
    for i, val in enumerate(reversed(iterable)):
        yield len(iterable) - 1 - i, val

for i, val in reverse_enumerate(x):
    ...

On Wed, Jul 20, 2016 at 10:42 AM, Ian Kelly <ian.g.kelly at gmail.com> wrote:

> I had occasion to write something like this:
>
>     for i, n in reversed(enumerate(x)): pass
>
> Of course this fails with "TypeError: argument to reversed() must be a
> sequence". I ended up using this instead:
>
>     for i, n in zip(reversed(range(len(x))), reversed(x)): pass
>
> This works but is extraordinarily ugly and not terribly clear. I think
> it's less confusing however than:
>
>     for i, n in zip(range(len(x)-1, -1, -1), reversed(n)): pass
>
> How would you write this?
> --
> https://mail.python.org/mailman/listinfo/python-list
>