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Created on 2017-12-05 23:19 by andreymal, last changed 2022-04-11 14:58 by admin. This issue is now closed.
| Files | ||||
|---|---|---|---|---|
| File name | Uploaded | Description | Edit | |
| wtf1.py | andreymal, 2017-12-05 23:19 | |||
| Pull Requests | |||
|---|---|---|---|
| URL | Status | Linked | Edit |
| PR 4858 | merged | nitishch, 2017-12-14 05:46 | |
| PR 5389 | merged | pitrou, 2018-01-28 16:42 | |
| Messages (4) | |||
|---|---|---|---|
| msg307698 - (view) | Author: andreymal (andreymal) | Date: 2017-12-05 23:19 | |
See attached file.
As documentation about "truncate" says, "The current stream position isn’t changed." This is true for most cases. But this is not true for "wtf1.py" example. If you run it with Linux (Tested Debian 8 and Arch; Windows was not tested by me) and Python 3.3+ (or with Python 2.7 using backported "io" module), then these lines:
print('tell:', fp.tell())
print('truncate:', fp.truncate())
print('tell again:', fp.tell())
prints this:
tell: 4098
truncate: 4098
tell again: 4
As you can see, "tell" before truncate and "tell" after truncate are different. Looks like bug.
This bug will not reproduce with Python 2.7 and builtin "open" function; it affects only "io.open".
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| msg310962 - (view) | Author: Antoine Pitrou (pitrou) *  |
Date: 2018-01-28 16:00 | |
New changeset 059f58ce938d9c3f0286412a4efb1b9131339421 by Antoine Pitrou (Nitish Chandra) in branch 'master': bpo-32228: Reset raw_pos after unwinding the raw stream (#4858) https://github.com/python/cpython/commit/059f58ce938d9c3f0286412a4efb1b9131339421 |
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| msg310973 - (view) | Author: Antoine Pitrou (pitrou) * |
Date: 2018-01-28 17:42 | |
New changeset 1d896ed2cddada4455f40782e4120249defbfa70 by Antoine Pitrou in branch '3.6': [3.6] bpo-32228: Reset raw_pos after unwinding the raw stream (GH-4858) (#5389) https://github.com/python/cpython/commit/1d896ed2cddada4455f40782e4120249defbfa70 |
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| msg310974 - (view) | Author: Antoine Pitrou (pitrou) * |
Date: 2018-01-28 17:44 | |
I've now pushed Nitish's fix to 3.7 and 3.6. I have no interest in backporting to 2.7 at this point. Closing! |
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| History | |||
|---|---|---|---|
| Date | User | Action | Args |
| 2022-04-11 14:58:55 | admin | set | github: 76409 |
| 2018-01-28 17:44:00 | pitrou | set | status: open -> closed versions: + Python 3.7, - Python 2.7, Python 3.4, Python 3.5 messages: + msg310974 resolution: fixed stage: patch review -> resolved |
| 2018-01-28 17:42:33 | pitrou | set | messages: + msg310973 |
| 2018-01-28 16:42:58 | pitrou | set | pull_requests: + pull_request5224 |
| 2018-01-28 16:00:11 | pitrou | set | nosy:
+ pitrou messages: + msg310962 |
| 2017-12-14 05:46:18 | nitishch | set | keywords:
+ patch stage: patch review pull_requests: + pull_request4747 |
| 2017-12-11 09:37:10 | nitishch | set | nosy:
+ nitishch |
| 2017-12-05 23:30:42 | andreymal | set | type: behavior |
| 2017-12-05 23:21:27 | andreymal | set | title: truncate() changes tell() result -> truncate() changes current stream position |
| 2017-12-05 23:19:14 | andreymal | create | |
