python / python/cpython

io.TextIOWrapper ignores silently partial write if buffer is unbuffered

Open
#85,393 10 comments 0 reactions 0 assignees View on GitHub

Nobody has claimed this yet.

3.12 3.13 3.14 extension-modules topic-IO type-bug
Dominant language
Python
Stars
77.2k
Forks
36k
PR merge metrics
PR metrics pending

Description

BPO 41221
Nosy @pitrou, @vstinner, @methane, @serhiy-storchaka, @eryksun, @manueljacob

Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.

Show more details

GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2020-07-06.17:33:53.629>
labels = ['type-bug', '3.8', 'expert-IO']
title = 'io.TextIOWrapper ignores silently partial write if buffer is unbuffered'
updated_at = <Date 2020-07-08.10:18:50.897>
user = 'https://github.com/manueljacob'

bugs.python.org fields:

activity = <Date 2020-07-08.10:18:50.897>
actor = 'eryksun'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['IO']
creation = <Date 2020-07-06.17:33:53.629>
creator = 'mjacob'
dependencies = []
files = []
hgrepos = []
issue_num = 41221
keywords = []
message_count = 8.0
messages = ['373151', '373167', '373203', '373207', '373216', '373287', '373289', '373300']
nosy_count = 6.0
nosy_names = ['pitrou', 'vstinner', 'methane', 'serhiy.storchaka', 'eryksun', 'mjacob']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue41221'
versions = ['Python 3.8']

Linked PRs
  • gh-134467

Contributor guide

Open the contributing guide

First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start with the io.TextIOWrapper entry point and review the linked PR gh-134467, since the issue provides no file or test names. Reproduce the unbuffered partial-write case and verify that the completed behavior no longer silently ignores the partial write.

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
Needs clarification
Newbie friendliness
25/100

Get new issues in your inbox

A short digest of beginner-friendly GitHub issues.