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Created on 2016-04-09 20:22 by Steven Reed, last changed 2022-04-11 14:58 by admin. This issue is now closed.
| Messages (2) | |||
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| msg263111 - (view) | Author: Steven Reed (Steven Reed) | Date: 2016-04-09 20:22 | |
Example repro: Python 3.5.1 (v3.5.1:37a07cee5969, Dec 6 2015, 01:54:25) [MSC v.1900 64 bit (AMD64)] on win32 Type "help", "copyright", "credits" or "license" for more information. >>> x=map(bool,[1,0,0,1,1,0]) >>> x <map object at 0x0000000000AC51D0> >>> list(x) [True, False, False, True, True, False] >>> list(x) [] >>> x <map object at 0x0000000000AC51D0> |
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| msg263112 - (view) | Author: Ned Deily (ned.deily) *  |
Date: 2016-04-09 20:28 | |
This is behaving as expected. In Python 3, map() returns an iterator, so the first list(x) exhausts that iterator so that the second list(x) returns an empty list. This is a difference from Python 2 where map() returns a list. See: https://docs.python.org/3.5/whatsnew/3.0.html#views-and-iterators-instead-of-lists https://docs.python.org/3/library/functions.html#map |
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| History | |||
|---|---|---|---|
| Date | User | Action | Args |
| 2022-04-11 14:58:29 | admin | set | github: 70912 |
| 2016-04-09 20:28:54 | ned.deily | set | status: open -> closed nosy: + ned.deily messages: + msg263112 resolution: not a bug stage: resolved |
| 2016-04-09 20:22:26 | Steven Reed | create | |