The question isn't shell OR Python.
My shell scripts call Python scripts, many of white I wrote myself. That is working as intended.
I guess this is a huge misconception about shell that I have to write a blog post about.
I'm often asked this about Oil : Why do you want to write programs in shell?
I need a language to glue them together. A language to express build automation and describe deployed systems. Most big systems consist of more than one language.
Shell is the best language for that, but it's also old and crufty, with poor implementations.
When you program in shell, gcc, git, pip, npm, markdown, rsync, diff, perf, strace, etc. are part of your "standard library".
If you want some concrete examples, look in the Oil repo. There are dozens of shell scripts that invoke custom tools in Python, R, and C++.
For example, to generate this report on how much we speed up Python by translating it to C++: https://www.oilshell.org/release/0.8.3/benchmarks.wwz/mycpp-...
The tables are manipulated by R code, and shell/Python/CommonMark generates the HTML.
Another example is that the release page is essentially a huge shell script: https://www.oilshell.org/release/0.8.3/
This page and all the linked pages are generated by: https://github.com/oilshell/oil/blob/master/devtools/release...
If you don't understand why shell should call Python and C, I recommend reading The Art of Unix Programming
I don't think this is a good characterization at all... Shell does not have git functionality (for example) built in. That is a dependency just like it would be for a python or rust project.
It's an analogy, not a precise statement. It could be made more precise by using Oil as the center of a container-based "semi-distro", i.e. a distro that does everything that's not hardware related.
I guess a little like the complement to what CoreOS was doing (or is?). (This is a project I've been thinking about for awhile; anyone should feel free to contact me if they've done something like that or have ideas. It's related to the dev tools problems described in the blog post.)