This, this, and this. We document our stuff using ReST and Sphinx. You can optionally specify data types in the docstrings, which does a ton to help with this.

This, this, and this. We document our stuff using ReST and Sphinx. You can optionally specify data types in the docstrings, which does a ton to help with this. It isn't time-consuming, and it makes your team not hate reading your stuff.