Python 3 f.tell() gets out of sync with file pointer in binary append+read mode
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3.7 (EOL)
3.8 (EOL)
topic-IO
type-bug
- Dominant language
- Python
- Stars
- 77.2k
- Forks
- 36k
- PR merge metrics
- PR metrics pending
Description
| BPO | 36411 |
|---|---|
| Nosy | @terryjreedy, @benjaminp, @vadmium, @serhiy-storchaka, @Windsooon, @pewscorner, @websurfer5 |
| PRs | |
| Files |
Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.
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GitHub fields:
assignee = None
closed_at = None
created_at = <Date 2019-03-24.00:33:44.992>
labels = ['3.8', 'type-bug', '3.7', 'expert-IO']
title = 'Python 3 f.tell() gets out of sync with file pointer in binary append+read mode'
updated_at = <Date 2019-06-01.11:04:40.585>
user = 'https://github.com/pewscorner'
bugs.python.org fields:
activity = <Date 2019-06-01.11:04:40.585>
actor = 'cheryl.sabella'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['IO']
creation = <Date 2019-03-24.00:33:44.992>
creator = 'pewscorner'
dependencies = []
files = ['48368', '48370']
hgrepos = []
issue_num = 36411
keywords = ['patch']
message_count = 13.0
messages = ['338709', '338775', '339171', '343340', '343341', '343345', '343742', '343744', '343955', '343969', '344017', '344049', '344151']
nosy_count = 7.0
nosy_names = ['terry.reedy', 'benjamin.peterson', 'martin.panter', 'serhiy.storchaka', 'Windson Yang', 'pewscorner', 'Jeffrey.Kintscher']
pr_nums = ['13717']
priority = 'normal'
resolution = None
stage = 'patch review'
status = 'open'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue36411'
versions = ['Python 3.7', 'Python 3.8']
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start by reviewing the linked PR #13717 and the supplied reproducers bpo-36411.py and bpo-36411.c. Run the reproducers to observe the f.tell() and file-pointer mismatch in binary append+read mode, then use the existing patch-review discussion to determine the expected synchronized behavior.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- python
- Domain
- backend
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 25/100