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Created on 2020-01-06 02:18 by Zac Hatfield-Dodds, last changed 2022-04-11 14:59 by admin. This issue is now closed.
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| msg359394 - (view) | Author: Zac Hatfield-Dodds (Zac Hatfield-Dodds) * | Date: 2020-01-06 02:18 | |
The value for `len` internally passes through an `ssize_t`, which means that it raises OverflowError for (very) large collections. This is admittedly only possible with collections such as `range` that do not store all their elements in memory, but it would still be nice to have `len(range(n)) == n` without caveats. This was found via a teaching example and is now tracked in my repo of property-based tests for CPython: https://github.com/rsokl/Learning_Python/pull/125 https://github.com/Zac-HD/stdlib-property-tests/blob/bb46996ca4500381ba09a8cd430caaddd71910bc/tests.py#L28-L34 Related to https://bugs.python.org/issue26423, but it's still present in the development branches for 3.7, 3.8, and 3.9; and instead of a wrong result it's an error (which is better!). |
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| msg359405 - (view) | Author: Mark Dickinson (mark.dickinson) *  |
Date: 2020-01-06 07:39 | |
Duplicate of #12159? |
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| msg359406 - (view) | Author: Mark Dickinson (mark.dickinson) * |
Date: 2020-01-06 07:45 | |
(See also #21444) |
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| History | |||
|---|---|---|---|
| Date | User | Action | Args |
| 2022-04-11 14:59:25 | admin | set | github: 83408 |
| 2020-01-07 01:33:00 | rhettinger | set | status: open -> closed resolution: duplicate stage: resolved |
| 2020-01-06 07:45:02 | mark.dickinson | set | messages: + msg359406 |
| 2020-01-06 07:39:32 | mark.dickinson | set | nosy:
+ mark.dickinson messages: + msg359405 |
| 2020-01-06 02:18:32 | Zac Hatfield-Dodds | create | |