This looks really interesting! It’s not about the syntax, but about the basic design philosophies + examples of packages that use it.

What’s init for me? Designing for Python package imports | Towards Data Science

Other stuff I learned about __init__.py:

• You can use it to enforce import order ¹
• You can use it to declare package variables
• Automatically import modules from a package²

Stuff I discovered:

• You can set a breakpoint in pdb physically into an __init__.py, and for example look at the stack of what called it with w