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I think you just answered your own question.
"What is the importance of Django, it's only 10 thousand lines of Python, powered by millions of lines of interpreter written in C..."
But Java does not need any marketing, people just quietly use it.
"Python is used heavily in academic research, particularly in bioinformatics, biology, and mathematics. It is the standard introductory language for many university computer science programs."
https://brainstation.io/career-guides/who-uses-python-today
Misquotation alert: I'm not claiming python is perfect for everything. There are times it makes sense to use something else. Not-short-scripts isn't it.
The impressive size of the big users actually works against proving how great it is.
Use the official version inside Google or Netflix: ok.
Use in a package where the package manager ensures all dependencies and versions are met exactly: ok
Use by writing and immediately using and discarding today: ok
Write a random script and expect it to work in 6 months or on any other machine or god forbid another platform: forget it.
python is great for the author and miserable for everyone else
I haven't had any problems with versions over the last 5 years. conda is a really good way of ensuring you get the same environment if you need to freeze versions.
Of all the Python packaging solutions, it's the worst.
The fact that so many people use it, as a matter of course, is further evidence of the fragility and complexity of maintaining Python tooling and codebases in general. The fragility of Python packaging is how we arrived at the current status quo of needing a CD/CI setup for hello-world.py. My statically-linked Fortran executables? I could keep copying around the same binaries until people switched architecture.
(yes I know it's configurable, but it also only behaves reasonably when & where that config is in place, not by default. It's opt-out vs opt-in)
The apt output had a ton of errors about py scripts with invalid syntax, and those scripts failing apparently broke everything else and half the system basically got uninstalled, and most of what's left doesn't work, half the services other startup actions failed. Even the login message is broken with python syntax errors. Don't even have network to fix it, even wired let alone wifi. It's reinstall time.
This is today 2024, not during some 15 years ago big transition, and the scripts that broke are all fully packaged and package-managed parts of the os, not even random normal end user written.
This is not remotely a problem of the past and it's all better now and "have you used it lately?".