There has been a spectacular growth in the availability of event data. To transport, store and exchange these event data, the eXtensible Event Stream (XES) has become the acknowledged standardization due to its simplicity, flexibility, extensibility and expressivity. Currently, the OpenXES library exists as the popular open-source Java implementation of the XES standard. However, despite the gaining popularity of Python as the core programming language for data science, there has yet to exist a complete and open-source implementation of the standard in the language. This paper presents OpyenXES as a complete and open-source implementation of the XES standard in Python. This opens up the rich portfolio of Python packages for data science to researchers and practitioners in the field of business process management.