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Groups > comp.lang.python > #103152
| From | Chris Angelico <rosuav@gmail.com> |
|---|---|
| Newsgroups | comp.lang.python |
| Subject | Re: [STORY-TIME] THE BDFL AND HIS PYTHON PETTING ZOO |
| Date | 2016-02-19 08:54 +1100 |
| Message-ID | <mailman.23.1455832493.2289.python-list@python.org> (permalink) |
| References | (1 earlier) <5d31dd14-1a60-4f80-8889-d0616f404c70@googlegroups.com> <4e902c58-3370-4adf-905d-74630a6eea90@googlegroups.com> <60036746-78f7-4f05-a6d8-04e88b09c00f@googlegroups.com> <032f0f66-34df-4325-98e0-1127025d2a94@googlegroups.com> <na5c1t$5pn$1@dont-email.me> |
On Fri, Feb 19, 2016 at 8:14 AM, Christian Gollwitzer <auriocus@gmx.de> wrote:
> Am 16.02.16 um 03:02 schrieb Rick Johnson:
>>
>> On Friday, February 12, 2016 at 1:51:35 AM UTC-6, John Ladasky wrote:
>>>
>>> I like lazy evaluation.
>>
>>
>> Well, it is a "Pythonic feature" no doubt.
>
>
>
> ?? I'm confused. Does Python have lazy evaluation? I thought that Python
> does eager evaluation. At least this snippet seems to confirm:
>
> def arg():
> print("Evaluating arg")
> return None
>
> def func(x):
> print("Evluating func")
> print(x)
>
> func(arg())
>
> If I run it, the output is:
>
> Evaluating arg
> Evluating func
>
> and I think that with side effects, only eager evaluation is really
> predictable.
Python's form of lazy evaluation comes in the form of functions that
return iterables, rather than concrete lists:
>>> def square(x):
... print("Squaring %d..." % x)
... return x*x
...
>>> squares = map(square, range(10))
>>> next(squares)
Squaring 0...
0
>>> next(squares)
Squaring 1...
1
>>> next(squares)
Squaring 2...
4
ChrisA
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[STORY-TIME] THE BDFL AND HIS PYTHON PETTING ZOO Rick Johnson <rantingrickjohnson@gmail.com> - 2016-02-02 19:26 -0800
Re: [STORY-TIME] THE BDFL AND HIS PYTHON PETTING ZOO John Ladasky <john_ladasky@sbcglobal.net> - 2016-02-02 22:02 -0800
Re: [STORY-TIME] THE BDFL AND HIS PYTHON PETTING ZOO Bernardo Sulzbach <mafagafogigante@gmail.com> - 2016-02-03 04:07 -0200
Re: [STORY-TIME] THE BDFL AND HIS PYTHON PETTING ZOO Rick Johnson <rantingrickjohnson@gmail.com> - 2016-02-06 12:54 -0800
Re: [STORY-TIME] THE BDFL AND HIS PYTHON PETTING ZOO INADA Naoki <songofacandy@gmail.com> - 2016-02-07 12:02 +0900
Re: [STORY-TIME] THE BDFL AND HIS PYTHON PETTING ZOO Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2016-02-07 16:59 +1100
Re: [STORY-TIME] THE BDFL AND HIS PYTHON PETTING ZOO Paul Rubin <no.email@nospam.invalid> - 2016-02-06 23:04 -0800
Re: [STORY-TIME] THE BDFL AND HIS PYTHON PETTING ZOO Rustom Mody <rustompmody@gmail.com> - 2016-02-06 23:31 -0800
Re: [STORY-TIME] THE BDFL AND HIS PYTHON PETTING ZOO Paul Rubin <no.email@nospam.invalid> - 2016-02-06 23:51 -0800
Re: [STORY-TIME] THE BDFL AND HIS PYTHON PETTING ZOO Chris Angelico <rosuav@gmail.com> - 2016-02-07 18:58 +1100
Re: [STORY-TIME] THE BDFL AND HIS PYTHON PETTING ZOO Jason Swails <jason.swails@gmail.com> - 2016-02-08 10:20 -0500
Re: [STORY-TIME] THE BDFL AND HIS PYTHON PETTING ZOO Christian Gollwitzer <auriocus@gmx.de> - 2016-02-07 08:44 +0100
Re: [STORY-TIME] THE BDFL AND HIS PYTHON PETTING ZOO Chris Angelico <rosuav@gmail.com> - 2016-02-07 14:06 +1100
Re: [STORY-TIME] THE BDFL AND HIS PYTHON PETTING ZOO Ian Kelly <ian.g.kelly@gmail.com> - 2016-02-08 08:40 -0700
Re: [STORY-TIME] THE BDFL AND HIS PYTHON PETTING ZOO Random832 <random832@fastmail.com> - 2016-02-08 10:44 -0500
Re: [STORY-TIME] THE BDFL AND HIS PYTHON PETTING ZOO wxjmfauth@gmail.com - 2016-02-09 01:15 -0800
Re: [STORY-TIME] THE BDFL AND HIS PYTHON PETTING ZOO Chris Angelico <rosuav@gmail.com> - 2016-02-09 02:46 +1100
Re: [STORY-TIME] THE BDFL AND HIS PYTHON PETTING ZOO Random832 <random832@fastmail.com> - 2016-02-08 10:53 -0500
Re: [STORY-TIME] THE BDFL AND HIS PYTHON PETTING ZOO Chris Warrick <kwpolska@gmail.com> - 2016-02-08 18:48 +0100
Re: [STORY-TIME] THE BDFL AND HIS PYTHON PETTING ZOO John Ladasky <john_ladasky@sbcglobal.net> - 2016-02-11 23:51 -0800
Re: [STORY-TIME] THE BDFL AND HIS PYTHON PETTING ZOO Rick Johnson <rantingrickjohnson@gmail.com> - 2016-02-15 18:02 -0800
Re: [STORY-TIME] THE BDFL AND HIS PYTHON PETTING ZOO Chris Angelico <rosuav@gmail.com> - 2016-02-16 13:30 +1100
Re: [STORY-TIME] THE BDFL AND HIS PYTHON PETTING ZOO John Ladasky <john_ladasky@sbcglobal.net> - 2016-02-15 21:24 -0800
Guido on python3 for beginners Rustom Mody <rustompmody@gmail.com> - 2016-02-17 00:51 -0800
Re: Guido on python3 for beginners Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2016-02-18 17:47 +1100
Re: Guido on python3 for beginners Ben Finney <ben+python@benfinney.id.au> - 2016-02-18 17:57 +1100
Re: Guido on python3 for beginners Paul Rubin <no.email@nospam.invalid> - 2016-02-17 22:59 -0800
Re: Guido on python3 for beginners "Sven R. Kunze" <srkunze@mail.de> - 2016-02-18 22:37 +0100
Re: Guido on python3 for beginners Random832 <random832@fastmail.com> - 2016-02-18 02:00 -0500
Re: Guido on python3 for beginners Chris Angelico <rosuav@gmail.com> - 2016-02-18 18:27 +1100
Re: Guido on python3 for beginners John Ladasky <john_ladasky@sbcglobal.net> - 2016-02-18 12:22 -0800
Re: Guido on python3 for beginners INADA Naoki <songofacandy@gmail.com> - 2016-02-18 17:00 +0900
Re: Guido on python3 for beginners Terry Reedy <tjreedy@udel.edu> - 2016-02-18 03:40 -0500
Re: Guido on python3 for beginners Steven D'Aprano <steve@pearwood.info> - 2016-02-20 18:59 +1100
Re: Guido on python3 for beginners Chris Angelico <rosuav@gmail.com> - 2016-02-18 20:57 +1100
Re: Guido on python3 for beginners Cem Karan <cfkaran2@gmail.com> - 2016-02-18 05:57 -0500
Re: Guido on python3 for beginners Chris Angelico <rosuav@gmail.com> - 2016-02-18 22:07 +1100
Re: Guido on python3 for beginners Rustom Mody <rustompmody@gmail.com> - 2016-02-18 04:25 -0800
Re: Guido on python3 for beginners Random832 <random832@fastmail.com> - 2016-02-18 10:51 -0500
Re: Guido on python3 for beginners Steven D'Aprano <steve@pearwood.info> - 2016-02-19 12:17 +1100
Re: Guido on python3 for beginners Rustom Mody <rustompmody@gmail.com> - 2016-02-18 19:39 -0800
Re: Guido on python3 for beginners Steven D'Aprano <steve@pearwood.info> - 2016-02-20 13:36 +1100
Re: Guido on python3 for beginners Larry Hudson <orgnut@yahoo.com> - 2016-02-20 00:37 -0800
Re: Guido on python3 for beginners Grant Edwards <invalid@invalid.invalid> - 2016-02-19 15:06 +0000
Re: Guido on python3 for beginners Rustom Mody <rustompmody@gmail.com> - 2016-02-18 19:32 -0800
Re: Guido on python3 for beginners Matt Wheeler <m@funkyhat.org> - 2016-02-18 16:44 +0000
Re: [STORY-TIME] THE BDFL AND HIS PYTHON PETTING ZOO wxjmfauth@gmail.com - 2016-02-17 08:39 -0800
Re: [STORY-TIME] THE BDFL AND HIS PYTHON PETTING ZOO Christian Gollwitzer <auriocus@gmx.de> - 2016-02-18 22:14 +0100
Re: [STORY-TIME] THE BDFL AND HIS PYTHON PETTING ZOO Chris Angelico <rosuav@gmail.com> - 2016-02-19 08:54 +1100
Re: [STORY-TIME] THE BDFL AND HIS PYTHON PETTING ZOO Ian Kelly <ian.g.kelly@gmail.com> - 2016-02-18 21:07 -0700
Re: [STORY-TIME] THE BDFL AND HIS PYTHON PETTING ZOO wxjmfauth@gmail.com - 2016-02-19 02:18 -0800
Re: [STORY-TIME] THE BDFL AND HIS PYTHON PETTING ZOO Wolfgang Maier <wolfgang.maier@biologie.uni-freiburg.de> - 2016-02-03 09:27 +0100
Re: [STORY-TIME] THE BDFL AND HIS PYTHON PETTING ZOO Grobu <snailcoder@retrosite.invalid> - 2016-02-03 09:38 +0100
Re: [STORY-TIME] THE BDFL AND HIS PYTHON PETTING ZOO wxjmfauth@gmail.com - 2016-02-03 09:16 -0800
Re: [STORY-TIME] THE BDFL AND HIS PYTHON PETTING ZOO Quivis <quivis@domain.invalid> - 2016-02-06 14:59 +0000
Re: [STORY-TIME] THE BDFL AND HIS PYTHON PETTING ZOO Ethan Furman <ethan@stoneleaf.us> - 2016-02-18 18:22 -0800
Re: [STORY-TIME] THE BDFL AND HIS PYTHON PETTING ZOO Jon Ribbens <jon+usenet@unequivocal.co.uk> - 2016-02-19 10:05 +0000
Re: [STORY-TIME] THE BDFL AND HIS PYTHON PETTING ZOO Terry Reedy <tjreedy@udel.edu> - 2016-02-19 23:15 -0500
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