Structure and Interpretation of Computer Programs

[Help Wanted] Clicking on URL fails to open helper program

7

Running this release: https://github.com/SrainApp/srain/releases/tag/1.2.1-windows 

I downloaded this: https://github.com/SrainApp/srain/releases/tag/1.2.1-windows and got this console transcript: ``` (srain.exe:13264): Gtk-WARNING **: 10:46:32.001: Could not load a pixbuf from /org/gtk/libgtk/theme/Adwaita/assets/bullet-symbolic.svg. This may indicate that pixbuf loaders or the mime...

programmatic invocation of a sub-application from another sub-application

3

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...

If the default value for Unicode is traitlets.Undefined, then why is it type string when tested? How can you enforce CLI definition of an attribute if it self-massages to ""?

2

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...

extra_args not documented

1

[`extra_args`](https://github.com/ipython/traitlets/blob/34f596dd03b98434900a7d31c912fc168342bb80/traitlets/config/application.py#L280) apparently has something to do with "extra command-line arguments that don't set config values" but nowhere is this functionality documented. I noticed it in a [towards data science article](https://towardsdatascience.com/tutorial-create-a-python-cli-package-a2410b47af35)....

In the [sample application on line 55](https://github.com/ipython/traitlets/blob/main/examples/myapp.py#L55) we see: classes = List([Bar, Foo]) but to learn what classes is we must read [this comment in the code](https://github.com/ipython/traitlets/blob/main/traitlets/config/application.py#L161): ``` # A...

Document how a Configurable instance loads a config file

1

In [the docs](https://traitlets.readthedocs.io/en/stable/config.html#python-configuration-files) we read; > After this configuration file is loaded, but 1. it is not clear how a configuration file for a Configurable instance is loaded... does it...

Document Application class overview

1

The [overview Docs for the `Application` class](https://traitlets.readthedocs.io/en/stable/config.html#the-main-concepts) has a number of statements that I find do not lead to complete understanding: > An application is a process that does a...

Document flag configuration

2

If one wants to have a boolean attribute of a Configurable/Application set via a flag, there is [quite a bit of configuration to do](https://towardsdatascience.com/tutorial-create-a-python-cli-package-a2410b47af35). Unfortunately, this configuration is not well-documented...