enthought/traits

View on GitHub

Observable typed attributes for Python classes

Stars: 462
Forks: 90
Open beginner issues: 0
Indexed issues: 226

Dominant language: Python
License: No license data
Last GitHub push: Aug 10, 2026
Latest indexed: Sep 15, 2026
Contributing guide: No contributing guide
Code of conduct: No code of conduct
Beginner labels: good first issue
PR merge metrics: No merged PRs in 30d

Open All

226 open issues indexed

Proposal: Lazy Property Open

type: enhancement

enthought/traits#1 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
tutorial needs traitsui removal Open

component: examples type: enhancement

enthought/traits#5 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 15, 2026
ProtototypedFrom issue using ColorTrait (maybe all the mapped traits) Open

enthought/traits#9 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
dynamic traits lose type information/validation when pickled or copied Open

enthought/traits#16 · 5 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Dynamic and decorated listeners fail unpredictably but deterministically Open

type: bug

enthought/traits#21 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
HasTraits.trait_set does not properly handle recursion Open

type: bug

enthought/traits#26 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Bad behavior of inherited traits with _ = Disallow Open

type: bug

enthought/traits#30 · 1 comment · 0 reactions · 1 assignee · Indexed Sep 15, 2026
`traits.adapts` confused when run repeatedly in an interactive session. Open

enthought/traits#46 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Failed assignment to HasStrictTraits instance modifies the class. Open

type: bug

enthought/traits#58 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
sync_traits creates reference cycles. Open

enthought/traits#69 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Regular and extended notifications behave differently Open

enthought/traits#92 · 8 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
`@on_trait_change` decorator is not lazy (and a special case of the same issue) Open

enthought/traits#94 · 10 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Detect multiple calls to a Traits default constructor. Open

type: enhancement

enthought/traits#103 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Add a documentation section with traits gotchas Open

type: enhancement

enthought/traits#129 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Adaptation manager should ignore multiple registration of equivalent offers Open

type: bug

enthought/traits#141 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
*synced* trait for Lists fires when items change, *synced* traits for Sets and Dicts do not Open

type: bug

enthought/traits#144 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Cached adapters do not allow adaptees to be garbage collected Open

type: bug

enthought/traits#169 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
AdaptationOffer with multiple target protocols Open

type: enhancement

enthought/traits#171 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Adaptation manager has ill-defined `sort` usage. Open

type: bug

enthought/traits#172 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
chained cached properties get evaluated too often Open

enthought/traits#200 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Trait factory method in traits.py caches by Id Open

type: bug

enthought/traits#201 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Recursive "DelegatesTo" causes stack overflow. Open

type: bug

enthought/traits#204 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
`AdaptsTo` trait fires change events even if value not changed Open

type: bug

enthought/traits#211 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Tuple defaults not properly evaluated. Open

type: bug

enthought/traits#217 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Problem locating icons for standalone applications generated by cx_freeze/py2exe Open

enthought/traits#228 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Docs: Explicitly describe the difference between "mylist" and "mylist[]" listeners Open

component: documentation

enthought/traits#229 · 4 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
_default() methods only call functions, instancemethods Open

type: enhancement

enthought/traits#230 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Traits listener bug with multiple identical items in a single list. Open

topic: traits listener rework type: bug

enthought/traits#237 · 6 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Difficulties with Traits initialization order: discussion. Open

component: documentation topic: hastraits initialization type: discussion

enthought/traits#238 · 4 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Dynamic handlers with extended trait names specifying metadata aren't called on dynamically added traits Open

enthought/traits#239 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Adaption feature request: `adapt` to any protocol of a set of protocols; pick the most specific Open

enthought/traits#244 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Distinction between static and dynamic handlers unclear in documentation Open

component: documentation

enthought/traits#256 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Interface checker doesn't handle mixins correctly Open

type: bug

enthought/traits#257 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Extend use of static notifications due to high memory consumption of dynamic ones Open

type: enhancement

enthought/traits#258 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Standard traits exception handler `_log_exception` should not blindly create handler Open

type: bug type: discussion

enthought/traits#265 · 10 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
confusing behavior with `depends_on` kwarg Open

type: bug

enthought/traits#274 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
strange `post_init` behavior with `on_trait_change` Open

priority: low topic: traits listener rework type: bug

enthought/traits#275 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Confused pop method in "Either(None, Dict)" trait. Open

type: bug

enthought/traits#278 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Traits listeners not hooked up on an explicit dict default. Open

topic: traits listener rework type: bug

enthought/traits#279 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Extended listeners on delegates don't always fire. Open

type: bug

enthought/traits#280 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 15, 2026
cache is not flushed in cached properties with explicit getter Open

type: bug

enthought/traits#282 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Event notification on Enum change with values traits Open

type: bug

enthought/traits#286 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Document AdaptationOffer and its uses. Open

component: documentation

enthought/traits#332 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
deferring_notification.py example broken Open

component: examples type: bug

enthought/traits#335 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Acessing a non existing instance attribute create a trait instance in the class Open

type: bug

enthought/traits#358 · 7 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
TraitError when doing |= on a Set. Open

topic: traits listener rework type: bug

enthought/traits#359 · 4 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Either trait displayed as many times as there is possible trait type Open

enthought/traits#375 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
HasStrictTraits class sets dunder values when passed to constructor Open

enthought/traits#378 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Interfaces does not check traits types Open

enthought/traits#384 · 4 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
array attribute is either True or None Open

enthought/traits#390 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026

enthought/traits

Get new issues in your inbox