For Developers

This section provides various hints for developers intending to contribute towards the HermesPy code base.

Unit Testing

In order to minimize the chance of code-regressions with new contributions, HermesPy implements various automated code testing routines. New contributions are required to pass existing tests as well as provide tests for additional features introduced with the contribution.

In order to launch unit tests locally,

python -m unittest discover tests/unit_tests

can be executed from the project’s root directory. This will execute all unit tests located under tests/unit_tests/. Additional tests for the integration of modules and the integrity of configuration files and examples can be found under tests/integration_tests/ and tests/config_tests/, respectively. For asserting the unit test coverage, the Hermes pipeline deploys the coverage tool. It can be executed by running the test script with the coverage command

coverage run tests/test_install tests/unit_tests

from the project’s root directory. The coverage report can be generated by running

coverage report -m --include=hermespy/*

which will generate a list of all code statements not covered by the unit tests. HermesPy is currently achieving a test coverage of 100% and kindly asks all contributors to maintain this level.

Type Checking

HermesPy is written in Python 3.10 and fully type annotated. The type annotations are checked by the mypy tool which can be executed by running by running


from the project’s root directory.

Coding Style

Hermes enforces PEP8 compliant coding style, which can be tested by running flake8

flake8 hermespy/

from the repository root. Most compliancy violations can be automatically resolved by running the black preprocessor

black -C hermespy/

from the repository root. Prior to their first execution, both tools must be manually installed in your environment of choice

pip install --upgrade flake8 black


The documentation is generated by Sphinx. It requires some additional dependencies which may be installed from PyPi via

pip install -e ".[documentation]"

The documentation source files are located under /docssource/, however, most API information should be directly inserted into the source code files and inserted by the autodocs extension. A reference example can be found in /hermespy/simulation/rf_chain/ See api/simulation.rf_chain.power_amplifier for the rendered results.

Sphinx with serveral extensions is used to generate the documentation. Build the documentation by executing

sphinx-build ./docssource/ ./documentation/

within the project’s root directory. This results in the rendering of a html-based documentation website, located under documentation/. In order to view it locally, open index.html within a web-browser of your choice.