Re: reversed(enumerate(x))

From	Michael Selik <michael.selik@gmail.com>
Newsgroups	comp.lang.python
Subject	Re: reversed(enumerate(x))
Date	2016-07-20 20:54 -0500
Message-ID	<mailman.12.1469066103.22221.python-list@python.org> (permalink)
References	<CALwzid=_6zUhLLp-WU9RcqJn0kic8q_LA9fcytG3srqGr+Q2MQ@mail.gmail.com> <B373842F-34E1-4FAC-B97A-15EDB42DCF05@gmail.com>

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> On Jul 20, 2016, at 12:42 PM, Ian Kelly <ian.g.kelly@gmail.com> wrote:
> 
>    for i, n in reversed(enumerate(x)): pass
> 
> fails with "TypeError: argument to reversed() must be a sequence".

So make it a sequence:
    for i, n in reversed(list(enumerate(x))): pass

If ``x`` is very large, you can use your zip/range technique to save memory.

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Re: reversed(enumerate(x)) Michael Selik <michael.selik@gmail.com> - 2016-07-20 20:54 -0500

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