core/MANIFEST.in (11 lines of code) (raw):
# Include anything required to run the library that is *not* a Python file in `src/`
include *.txt tox.ini .coveragerc *.rst
recursive-include tests *.py *.json
# Source Code
recursive-include src *.proto
# Documentation
recursive-include docs *.png
recursive-include docs *.ico
recursive-include docs *.rst
# No need for GitHub-specific files.
prune .github