python-attrs/attrs

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Python Classes Without Boilerplate

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Forks: 480
Open beginner issues: 0
Indexed issues: 134
Avg merge: 2h 15m
Merged PRs (30d): 2

Dominant language: Python
License: MIT
Last GitHub push: Sep 1, 2026
Latest indexed: Sep 20, 2026
Contributing guide: Contributing guide
Code of conduct: Code of conduct
Beginner labels: No beginner labels indexed

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134 open issues indexed

Looking to Contribute - What Should I Work On? Open

Difficulty 5/5 Over a week Newbie friendliness 20/100

python-attrs/attrs#1620 · Opened Sep 7, 2026
Incorrect annotation for forward reference in generated constructor Open

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

python-attrs/attrs#1596 · 2 comments · 1 reaction · Opened Jul 28, 2026
Decorated functions do not work with inheritance Open

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

python-attrs/attrs#1549 · 3 comments · Opened Apr 27, 2026
Making third-party extensions a bit easier Open

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

python-attrs/attrs#1543 · 2 comments · Opened Apr 13, 2026
Expose cached property functions of slots classes via public API Open

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

python-attrs/attrs#1532 · Opened Mar 19, 2026
No way to make instances of different classes equal without rewriting `__eq__()` entirely Open

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

python-attrs/attrs#1500 · 1 comment · Opened Jan 16, 2026
attr'd classes don't have default attributes? Open

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

python-attrs/attrs#1477 · 2 comments · Opened Oct 10, 2025
Add utility to print source of attrs class. Open

Feature

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

python-attrs/attrs#1472 · 3 comments · Opened Sep 13, 2025
Support 3.14 annotations in converter functions Open

Typing

Difficulty 3/5 1-2 days Newbie friendliness 48/100

python-attrs/attrs#1470 · 6 comments · Opened Sep 10, 2025
`__hash__` with custom `__eq__` Open

Difficulty 4/5 3-5 days Newbie friendliness 30/100

python-attrs/attrs#1462 · 2 comments · Opened Aug 29, 2025
Extending attrs-generated `__eq__` Open

Difficulty 3/5 1-2 days Newbie friendliness 42/100

python-attrs/attrs#1452 · 3 comments · 1 reaction · Opened Jul 31, 2025
Add `on_change` similar to `on_setattr`, but called after updating the instance. Open

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

python-attrs/attrs#1437 · 8 comments · Opened Jun 25, 2025
Can only populate attrs classes with `_CountingAttr` instances Open

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

python-attrs/attrs#1424 · 1 comment · 1 reaction · Opened Apr 6, 2025
Add `**kwargs` to validator function calls for more flexibility Open

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

python-attrs/attrs#1421 · 1 comment · Opened Mar 26, 2025
Combine multiple classes Open

Feature

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

python-attrs/attrs#1392 · 7 comments · Opened Jan 5, 2025
Adding runtime_checkable to AttrsInstance Open

Feature

Difficulty 1/5 1-3 hours Newbie friendliness 35/100

python-attrs/attrs#1388 · 1 comment · Opened Dec 23, 2024
Pylance doesn't recognise attributes obtained from `fields` Open

Pyright Typing

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

python-attrs/attrs#1361 · 2 comments · Opened Oct 23, 2024
self.__attrs_init__ doesn't play well with pylance/pyright Open

Pyright Typing

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

python-attrs/attrs#1360 · 1 comment · Opened Oct 18, 2024
Passing arguments to `__attrs_init_subclass__` Open

Feature

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

python-attrs/attrs#1335 · 4 comments · 2 reactions · Opened Aug 13, 2024
distinguish a class that inherits from an attrs class from a true (decorated) attrs class Open

Difficulty 3/5 1-2 days Newbie friendliness 25/100

python-attrs/attrs#1334 · 4 comments · Opened Aug 12, 2024
cached_property in slotted classes doesn't work if overridden in child class Open

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

python-attrs/attrs#1333 · 1 comment · Opened Aug 9, 2024
slots + cached_property + sphinx Open

Difficulty 4/5 3-5 days Newbie friendliness 30/100

python-attrs/attrs#1325 · 10 comments · Opened Aug 4, 2024
Adding docstrings to classes created with `make_class` Open

Feature

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

python-attrs/attrs#1309 · 7 comments · Opened Jul 19, 2024
Suggestion: Consider changing the order for variable initialization in `__init__` Open

Feature

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

python-attrs/attrs#1296 · 1 comment · Opened Jun 14, 2024
Mechanism for adding per-attribute docstrings to __slots__ Open

Feature

Difficulty 4/5 3-5 days Newbie friendliness 48/100

python-attrs/attrs#1294 · 4 comments · 1 reaction · Opened Jun 7, 2024
`__getattr__` in child class gets called when mixed with `cached_property` Open

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

python-attrs/attrs#1288 · 10 comments · Opened Jun 1, 2024
Typing error when defining an enum of an attrs class Open

Bug Typing

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

python-attrs/attrs#1287 · 2 comments · Opened May 20, 2024
Convenience decorators for promoting functions to attrs-compatible validators Open

Feature

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

python-attrs/attrs#1257 · 5 comments · Opened Mar 7, 2024
Add support for marking classes `typing.final` Open

Typing

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

python-attrs/attrs#1247 · 3 comments · Opened Feb 25, 2024
Wrong error message for inner validators Open

Difficulty 3/5 1-2 days Newbie friendliness 48/100

python-attrs/attrs#1245 · 1 comment · Opened Feb 21, 2024
Typing problem for validator collections Open

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

python-attrs/attrs#1244 · Opened Feb 21, 2024
Way to specify KW_ONLY location in the constructor like in dataclass.KW_ONLY Open

dataclasses Feature

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

python-attrs/attrs#1241 · Opened Feb 20, 2024
wishlist: attrs.validators.instance_of parse nested types (lists and maps) not needing verbose deep_iterable, deep_map and optional Open

Feature

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

python-attrs/attrs#1235 · Opened Feb 4, 2024
Special handling of descriptor field like in dataclasses Open

dataclasses Feature

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

python-attrs/attrs#1232 · 6 comments · 3 reactions · Opened Feb 2, 2024
`attr.Attributes` incompatible with `Literal` Open

Typing

python-attrs/attrs#1207 · 3 comments · 1 assignee · Opened Nov 25, 2023
Typing fails when list of validators where one is custom and one is built in Open

Typing

Difficulty 3/5 1-2 days Newbie friendliness 38/100

python-attrs/attrs#1197 · 5 comments · Opened Oct 31, 2023
Use field *repr* callable to dynamically define repr based on instance value Open

Feature

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

python-attrs/attrs#1193 · 4 comments · Opened Oct 18, 2023
attr.asdict -> attrs.asdict regression for sets of instances Open

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

python-attrs/attrs#1180 · 2 comments · 1 reaction · Opened Aug 25, 2023
attrs deviation from PEP 681 Open

dataclasses Typing

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

python-attrs/attrs#1170 · 4 comments · Opened Aug 1, 2023
How to initialize an instance where all fields are default values? Open

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

python-attrs/attrs#1169 · 7 comments · Opened Aug 1, 2023
Performance Improvement for evolve function Open

Performance

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

python-attrs/attrs#1145 · 3 comments · Opened Jun 9, 2023
attrs.astuple() leaves performance on the table compared to operator.attrgetter Open

Performance

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

python-attrs/attrs#1129 · Opened Apr 16, 2023
Evolve converts/validates again not changed fields Open

Feature

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

python-attrs/attrs#1126 · 1 comment · Opened Apr 13, 2023
Brainstorming: Pick types Open

Thinking Typing

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

python-attrs/attrs#1125 · 2 comments · Opened Apr 10, 2023
Pass the attribute name to the converter? (3 arg converters) Open

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

python-attrs/attrs#1108 · 4 comments · Opened Feb 28, 2023
Attrs support for publish/subscribe Open

Feature

Difficulty 4/5 3-5 days Newbie friendliness 48/100

python-attrs/attrs#1100 · 6 comments · Opened Feb 10, 2023
Remove ability to `__setstate__` from "legacy" tuple format soon Open

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

python-attrs/attrs#1091 · Opened Jan 26, 2023
Support evolving to a subclass (possibly any class) Open

Feature

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

python-attrs/attrs#1088 · 8 comments · Opened Jan 19, 2023
Possible class creation optimization Open

Feature Performance

Difficulty 5/5 Over a week Newbie friendliness 20/100

python-attrs/attrs#1083 · 1 comment · 2 reactions · Opened Jan 11, 2023
Allow to pass a callable for field-level hash Open

Feature

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

python-attrs/attrs#1076 · 1 comment · Opened Jan 2, 2023

python-attrs/attrs

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