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A lightweight Traits like module

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Hey there, At first, thank you for this amazing library! I noticed that there are problems when linking multiple objects using the link function, if the value of a trait...

The docs for the [Application](https://traitlets.readthedocs.io/en/latest/config-api.html#traitlets.config.Application) class don't mention the default value of the `log` trait on `Application` to be a `Logger` instance named with `self.__class__.__name__`. I had to dig through...

rather than the other way around, since tooling doesn't seem to support building version strings from version tuples these days. use lighter subset of pep440 since we don't need every...

I desire to invoke one sub-application from another sub-application. To do so is cumbersome, because I must construct a command-line and then invoke the subcommand via `subprocess` like so: ```python...

I am putting this here to that others can see how to access the values within the dict returned by `.traits()`. As you can see, the way to get the...

The code below shows that even though `x` is never given a value, it is an empty string. Why do [the docs](https://traitlets.readthedocs.io/en/stable/trait_types.html#traitlets.Unicode) for `Unicode` state `default_value=traitlets.Undefined` yet the type is...

I'm trying to package your module as an rpm package. So I'm using the typical PEP517 based build, install and test cycle used on building packages from non-root account. -...

hi I have this error with Qtconssole-5.3.0 and Traitlets-5.2.1post0 on Windows ![image](https://user-images.githubusercontent.com/4312421/170837126-ebd819bb-18a5-4b4f-88b9-0ebf91c8fd0f.png)

As of traitlets-5.2.2, packages that depend on traitlets (e.g.: the `jupyter` CLI tool) raise assertion errors when importing the `traitlets` package: ``` Traceback (most recent call last): File "C:\Miniconda\lib\runpy.py", line...