Python however has static analysis tools that are unavailable in R. I wonder if there is a data manipulation library in python that takes advantage of this. Looking at this library, it doesn't appear to use type hints. Other libraries, like pandas, have some basic support for typings but they are still far from being fully typed.
For example, siuba allows users to create custom functions using a thin wrapper around functools.singledispatch.
When deciding how to run...
df >> filter(my_custom_func(_.x))
Would be super interesting to try and lay out what would be needed to do static analysis via mypy. I think it'd require some plugins for singledispatch at least, probably some reworking things in ways myoy expects.
https://nbviewer.jupyter.org/github/machow/siuba/blob/master...