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Re: Generator using item[n-1] + item[n] memory

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On Sat, Feb 15, 2014 at 6:27 PM, Ian Kelly <ian.g.kelly@gmail.com> wrote:
> On Fri, Feb 14, 2014 at 8:31 PM, Nick Timkovich <prometheus235@gmail.com> wrote:
>> OK, now the trick; adding `data = None` inside the generator works, but in
>> my actual code I wrap my generator inside of `enumerate()`, which seems to
>> obviate the "fix".  Can I get it to play nice or am I forced to count
>> manually. Is that a feature?
>
> Yeah, looks like enumerate also doesn't release its reference to the
> previous object until after it gets the next one.  You'll just have to
> make do without.

You could write your own enumerate function.

def enumerate(it, i=0):
    it = iter(it)
    while True:
        yield i, next(it)
        i += 1

That shouldn't keep any extra references around.

ChrisA

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Re: Generator using item[n-1] + item[n] memory Roy Smith <roy@panix.com> - 2014-02-14 22:21 -0500
  Re: Generator using item[n-1] + item[n] memory Nick Timkovich <prometheus235@gmail.com> - 2014-02-14 21:31 -0600
  Re: Generator using item[n-1] + item[n] memory Ian Kelly <ian.g.kelly@gmail.com> - 2014-02-15 00:27 -0700
  Re: Generator using item[n-1] + item[n] memory Chris Angelico <rosuav@gmail.com> - 2014-02-15 18:41 +1100
  Re: Generator using item[n-1] + item[n] memory Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2014-02-15 11:03 +0000
  Re: Generator using item[n-1] + item[n] memory Peter Otten <__peter__@web.de> - 2014-02-15 12:27 +0100
  Re: Generator using item[n-1] + item[n] memory Mark Lawrence <breamoreboy@yahoo.co.uk> - 2014-02-15 12:28 +0000

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