ipython/traitlets

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A lightweight Traits like module

Stars: 653
Forks: 217
Open beginner issues: 0
Indexed issues: 99
Avg merge: 2d 21h
Merged PRs (30d): 2

Dominant language: Python
License: BSD-3-Clause
Last GitHub push: Sep 3, 2026
Latest indexed: Sep 17, 2026
Contributing guide: Contributing guide
Code of conduct: No code of conduct
Beginner labels: good first issue

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99 open issues indexed

TypeError: 'LazyConfigValue' object is not iterable Open

ipython/traitlets#69 · 5 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
Passing config using environment variables Open

ipython/traitlets#99 · 6 comments · 1 reaction · 0 assignees · Indexed Sep 17, 2026
initialize_subcommand does not print help Open

ipython/traitlets#103 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
Trait introspection Open

ipython/traitlets#130 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
conf.d-style loading of a bag of files Open

ipython/traitlets#192 · 4 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
Unhelpful error logs from config API on failing to decode JSON Open

ipython/traitlets#203 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
autodoc plugin for sphinx Open

ipython/traitlets#210 · 2 comments · 1 reaction · 0 assignees · Indexed Sep 17, 2026
observe and unobserve take mutable default argument Open

ipython/traitlets#216 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 17, 2026
don't use `type` as kwarg Open

ipython/traitlets#220 · 4 comments · 1 reaction · 0 assignees · Indexed Sep 17, 2026
Container default_values are None, other traits default values are Undefined. Open

ipython/traitlets#222 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
Add CInteger trait type Open

ipython/traitlets#243 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
explicit list exported traits with `__all__` Open

ipython/traitlets#265 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
Support observe as a decorator outside of classes Open

ipython/traitlets#273 · 7 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
Possible move of comparison to a separate function inside set Open

ipython/traitlets#277 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 17, 2026
Custom validator registration Open

ipython/traitlets#298 · 14 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
Instance trait type default value confusion Open

ipython/traitlets#315 · 5 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
document min, max kwargs to traitlets.{Int,Float} Open

good first issue

ipython/traitlets#357 · 0 comments · 1 reaction · 0 assignees · Indexed Sep 17, 2026
Issue with default_value for List trait Open

ipython/traitlets#366 · 7 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
`Application.launch_instance()` does not return any `start()` values Open

ipython/traitlets#369 · 4 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
Make `c.` optional in config file ? Open

enhancement needs-info question

ipython/traitlets#370 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
LoggingConfigurable logging level should be configurable. Open

ipython/traitlets#374 · 1 comment · 1 reaction · 0 assignees · Indexed Sep 17, 2026
using traitlets.config.get_config() in python config file breaks load_config_file Open

ipython/traitlets#379 · 4 comments · 1 reaction · 0 assignees · Indexed Sep 17, 2026
Define Notification Types With Sentinels? Open

ipython/traitlets#387 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
Cross-validation of dependent traits Open

ipython/traitlets#389 · 14 comments · 1 reaction · 0 assignees · Indexed Sep 17, 2026
Document `TraitType.read_only` Open

documentation

ipython/traitlets#410 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
Nested configurables Open

ipython/traitlets#421 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
How can I override `traitlets.config.catch_config_error()` decorator? Open

ipython/traitlets#427 · 0 comments · 1 reaction · 0 assignees · Indexed Sep 17, 2026
Obscure error: <class ...> is not in list (class not in MRO) Open

ipython/traitlets#445 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 17, 2026
Why prematurely clone `self.config` in `update_config()`? Open

ipython/traitlets#446 · 5 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
Feature request: combine callback calls after holding notifications Open

ipython/traitlets#450 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
Introduce @preprocess decorator? Open

ipython/traitlets#451 · 4 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
changing default value of containers to None Open

ipython/traitlets#455 · 5 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
Better introspection functions: info/repr Open

ipython/traitlets#459 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
help= does not set trait docstring Open

enhancement good first issue sprint-friendly

ipython/traitlets#461 · 6 comments · 1 reaction · 0 assignees · Indexed Sep 17, 2026
Duplicate invocation of validate() on Configurable._load_config() Open

ipython/traitlets#467 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
More thorough testing of downstream projects Open

ipython/traitlets#472 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
Cannot instantiate a subcommand if it inherits the same baseclass with a parent-cmd Open

ipython/traitlets#474 · 9 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
CRegExp hides usefull exception when compiling pattern Open

ipython/traitlets#475 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
copy(HasTraits) creates a clone with shared state from the original Open

ipython/traitlets#481 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
The behaviour of traitlets.All in observe/unobserve Open

good first issue

ipython/traitlets#485 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
Possible or plan to implement cached_property? Open

ipython/traitlets#486 · 2 comments · 1 reaction · 0 assignees · Indexed Sep 17, 2026
Capturing BaseException in Traitlests and when loading pyconfig files Open

ipython/traitlets#494 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
Application.print_alias_help() should take into account *any* Configurable class Open

ipython/traitlets#499 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
flake8 sees 'c' as an undefined name Open

good first issue

ipython/traitlets#502 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
Improving link and dlink Open

ipython/traitlets#512 · 6 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
generate_config_file: Writing empty sets Open

ipython/traitlets#513 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
Adding __slots__ to improve performance. Open

good first issue

ipython/traitlets#519 · 1 comment · 1 reaction · 0 assignees · Indexed Sep 17, 2026
Add Deprecation of Trait Declarations via Classes to Migration Notes Open

good first issue

ipython/traitlets#520 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
get function of TraitType(BaseDescriptor) is called right after start ipython and then run forever? Open

ipython/traitlets#533 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 17, 2026
IndexError in start_ipython when sys.argv is empty Open

ipython/traitlets#540 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026

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