This is a Python module and command line fully compatible with WaveDrom, which is originally implemented in JavaScript. It is useful if you want to generate wavedrom diagrams from a Python environment or simply don't want to install the Node.js environment just to use WaveDrom as simple command line. WaveDromPy is for example used in sphinxcontrib-wavedrom to render wavedrom for Sphinx documentation. While the original project renders the diagrams in JavaScript in the browser, WaveDromPy renders them to SVG files. This tool is a direct translation of original Javascript file WaveDrom.js to Python. No extra feature added. We seek to have it fully compatible. The tool WaveDromPy directly converts WaveDrom compatible JSON files into SVG format.