python-trio/trio

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Trio – a friendly Python library for async concurrency and I/O

Stars: 7.3k
Forks: 431
Open beginner issues: 0
Indexed issues: 278
Avg merge: 2d 17h
Merged PRs (30d): 6

Dominant language: Python
License: No license data
Last GitHub push: Sep 17, 2026
Latest indexed: Sep 19, 2026
Contributing guide: Contributing guide
Code of conduct: Code of conduct
Beginner labels: good first issue

Beginner friendly Everything

Open All

278 open issues indexed

Missing Cygwin support Open

Difficulty 4/5 3-5 days Newbie friendliness 52/100

python-trio/trio#3513 · 7 comments · Opened Sep 14, 2026
KeyError in KqueueIOManager.process_events (TrioInternalError) Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

python-trio/trio#3500 · 15 comments · 1 reaction · Opened Aug 31, 2026
Don't run SSL tests on Windows x86 Open

Difficulty 2/5 1-3 hours Newbie friendliness 65/100

python-trio/trio#3466 · 2 comments · Opened Jul 4, 2026
Support `zuban` Open

typing

Difficulty 5/5 Over a week Newbie friendliness 25/100

python-trio/trio#3457 · 4 comments · Opened Jun 26, 2026
Switch to `pylock.toml` from our `test-requirements.txt` lockfile Open

Difficulty 4/5 3-5 days Newbie friendliness 42/100

python-trio/trio#3437 · 1 comment · 1 reaction · Opened May 9, 2026
Pin actions to hashes Open

Difficulty 3/5 1-2 days Newbie friendliness 55/100

python-trio/trio#3422 · 1 comment · 1 reaction · Opened Apr 8, 2026
Run flake8-async in precommit Open

Difficulty 2/5 1-3 hours Newbie friendliness 45/100

python-trio/trio#3396 · 2 comments · Opened Feb 18, 2026
Type annotations for `trio.open_file` & `trio.wrap_file` Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

python-trio/trio#3390 · 3 comments · Opened Feb 13, 2026
trio.wrap_file() undocumented behavior wrt to sync file object Open

docs

Difficulty 1/5 1-3 hours Newbie friendliness 76/100

python-trio/trio#3379 · 2 comments · Opened Jan 18, 2026
`sleep()` hangs indefinitely when using a custom clock Open

Difficulty 4/5 3-5 days Newbie friendliness 42/100

python-trio/trio#3369 · 13 comments · Opened Dec 8, 2025
run_process ignores thread context and spawns from threadpool Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

python-trio/trio#3360 · 2 comments · Opened Nov 26, 2025
Fix old Gitter links Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

python-trio/trio#3342 · 3 comments · 1 reaction · Opened Oct 4, 2025
More robust CancelScope misnesting prevention Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

python-trio/trio#3329 · Opened Sep 10, 2025
WASM support Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

python-trio/trio#3311 · 4 comments · Opened Aug 4, 2025
We could have an ABC for synchronous channels Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

python-trio/trio#3310 · 9 comments · Opened Aug 4, 2025
run_process: Document pitfalls re/ Ctrl+C and not creating a new process group Open

docs

Difficulty 2/5 1-3 hours Newbie friendliness 68/100

python-trio/trio#3300 · 9 comments · Opened Jul 14, 2025
Internal error with recursive tasks and cancellation Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

python-trio/trio#3290 · 1 comment · Opened Jun 16, 2025
Raise RecursionError if nurseries are too nested Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

python-trio/trio#3289 · 4 comments · Opened Jun 16, 2025
Support `ty` Open

typing

Difficulty 3/5 1-2 days Newbie friendliness 45/100

python-trio/trio#3288 · 1 comment · 1 reaction · Opened Jun 16, 2025
Support `pyrefly` Open

typing

Difficulty 4/5 3-5 days Newbie friendliness 35/100

python-trio/trio#3287 · 2 comments · Opened Jun 16, 2025
More traceback cleaning Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

python-trio/trio#3279 · 4 comments · Opened Jun 5, 2025
CPython 3.14 and Cython==3.1.0 CI issues Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

python-trio/trio#3267 · 5 comments · Opened May 14, 2025
shell command does not terminate on cancel Open

Difficulty 4/5 3-5 days Newbie friendliness 38/100

python-trio/trio#3237 · 12 comments · Opened Apr 1, 2025
Add exception message for easier debugging with `Cancelled` Open

debugging design discussion

Difficulty 5/5 Over a week Newbie friendliness 35/100

python-trio/trio#3232 · 11 comments · 1 reaction · Opened Mar 27, 2025
Some publicly exposed functions/properties have no documentation Open

docs good first issue

Difficulty 4/5 3-5 days Newbie friendliness 45/100

python-trio/trio#3226 · 13 comments · Opened Mar 20, 2025
Some functions and properties in the documentation have no docstring Open

docs good first issue

Difficulty 3/5 1-2 days Newbie friendliness 55/100

python-trio/trio#3221 · 10 comments · Opened Mar 10, 2025
Replace check.sh and/or ci.sh with tox/nox Open

project meta

python-trio/trio#3170 · 5 comments · 1 reaction · 1 assignee · Opened Dec 24, 2024
It might be worth adding zizmor as a GitHub action Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

python-trio/trio#3168 · Opened Dec 23, 2024
add mypy run on py3.13 Open

Difficulty 2/5 1-3 hours Newbie friendliness 62/100

python-trio/trio#3165 · 2 reactions · Opened Dec 22, 2024
yaml formatting/linting Open

python-trio/trio#3164 · 5 comments · 1 assignee · Opened Dec 22, 2024
Add `coverage-conditional-plugin` Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

python-trio/trio#3163 · 8 comments · Opened Dec 22, 2024
Create documentation page for typing Open

Difficulty 3/5 1-2 days Newbie friendliness 45/100

python-trio/trio#3142 · 4 comments · 1 reaction · Opened Nov 21, 2024
Add a CI run for no-IPv6 Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

python-trio/trio#3137 · 1 comment · Opened Nov 18, 2024
cython tasks are KI protected Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

python-trio/trio#3122 · 6 comments · Opened Oct 27, 2024
Describe our attrs usage in contributor guide Open

docs project meta

Difficulty 4/5 3-5 days Newbie friendliness 45/100

python-trio/trio#3116 · 2 comments · 1 reaction · Opened Oct 19, 2024
Enable inspection of `fail_at`/`fail_after` attributes Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

python-trio/trio#3090 · Opened Sep 19, 2024
Idea: deterministic thread and I/O handling for certain tests Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

python-trio/trio#3089 · Opened Sep 17, 2024
Make it easier to check the formatting of a newsfragment locally Open

Difficulty 3/5 1-2 days Newbie friendliness 45/100

python-trio/trio#3084 · 2 comments · Opened Sep 10, 2024
Make it easier to see if a `Task` is created/running/exited Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

python-trio/trio#3079 · 4 comments · Opened Sep 2, 2024
Add `TypeVarTuple` to `Nursery.start` Open

typing

Difficulty 5/5 Over a week Newbie friendliness 25/100

python-trio/trio#3023 · 3 comments · Opened Jun 26, 2024
Ctrl+C behavior problems at the new REPL Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

python-trio/trio#3007 · 11 comments · Opened May 31, 2024
Cancellation may not always immediately happen at checkpoints Open

cancellation design discussion docs

Difficulty 5/5 Over a week Newbie friendliness 45/100

python-trio/trio#2973 · 11 comments · Opened Mar 14, 2024
Please switch to v1.0 and start using semantic version numbers Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

python-trio/trio#2961 · 17 comments · 3 reactions · Opened Feb 19, 2024
Remove `UnboundedQueue` Open

Difficulty 3/5 1-2 days Newbie friendliness 68/100

python-trio/trio#2922 · 2 comments · Opened Jan 10, 2024
TaskStatus.started() being a no-op if cancelled can cause deadlocks Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

python-trio/trio#2895 · 2 comments · Opened Dec 1, 2023
CI changes Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

python-trio/trio#2885 · 17 comments · 2 reactions · Opened Nov 24, 2023
fill in pyproject.toml project.maintainers field Open

Difficulty 1/5 Under an hour Newbie friendliness 35/100

python-trio/trio#2868 · Opened Nov 5, 2023
Mark pure reformatting PRs in .git-blame-ignore-revs Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

python-trio/trio#2837 · 3 comments · Opened Oct 26, 2023
Replace Autodeps with pre-commit? Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

python-trio/trio#2835 · 5 comments · Opened Oct 25, 2023
Create a Limiter Protocol Open

typing

Difficulty 5/5 Over a week Newbie friendliness 30/100

python-trio/trio#2824 · Opened Oct 19, 2023

python-trio/trio

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