Groups > comp.lang.python > #197085

Re: Lengthy numbers

From	Paul Rubin <no.email@nospam.invalid>
Newsgroups	comp.lang.python
Subject	Re: Lengthy numbers
Date	2024-12-23 15:38 -0800
Organization	A noiseless patient Spider
Message-ID	<871pxy9di2.fsf@nightsong.com> (permalink)
References	<eXx9P.64901$o72.28550@fx01.ams4> <mailman.14.1734910364.2912.python-list@python.org> <extend-20241223090009@ram.dialup.fu-berlin.de>

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ram@zedat.fu-berlin.de (Stefan Ram) writes:
>   So in theory, this would crank out an infinite list that looks like
>   [0, 0, 0, 0, ...]. In the real world, though, if you try to print or
>   use this list, your program will probably freeze up faster than the
>   405 at rush hour.

The freeze-up happens as soon as you create the list.  Unfortunately
iterators don't have anything like .extend so I don't see a way to
create recursive ones like that, short of writing more verbose code
using yield.  In Haskell it is straightforward:

    fibonacci = 0 : 1 : zipWith (+) (tail fibonacci)

    main = print (take 10 fibonacci)

should print [0,1,1,2,3,5,8,13,21,34].

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Lengthy numbers Gilmeh Serda <gilmeh.serda@nothing.here.invalid> - 2024-12-21 11:49 +0000
  Re: Lengthy numbers (Posting On Python-List Prohibited) Lawrence D'Oliveiro <ldo@nz.invalid> - 2024-12-21 21:03 +0000
    Re: Lengthy numbers (Posting On Python-List Prohibited) Gilmeh Serda <gilmeh.serda@nothing.here.invalid> - 2024-12-22 09:18 +0000
      Re: Lengthy numbers (Posting On Python-List Prohibited) Lawrence D'Oliveiro <ldo@nz.invalid> - 2024-12-23 23:06 +0000
  Re: Lengthy numbers Oscar Benjamin <oscar.j.benjamin@gmail.com> - 2024-12-22 23:32 +0000
    Re: Lengthy numbers Paul Rubin <no.email@nospam.invalid> - 2024-12-23 15:03 -0800
    Re: Lengthy numbers Paul Rubin <no.email@nospam.invalid> - 2024-12-23 15:38 -0800

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