We follow PEP8 with the exception of maximum line length set to 120. We
use numpy style docstrings with the exception of ommitting argument
types in the docstrings in favour of type hints in function and class
signatures. We use mypy to typecheck code with exceptions for
libraries with missing stubs specified in setup.cfg.
Before a PR is accepted, TravisCI builds must pass. We use flake8 for
linting (with exceptions to PEP8 described in setup.cfg and pytest
for testing. We use sphinx for building documentation.