The following description was either submitted by the Conference Organizer on Monday, January 13th 2020, or created by us. Being held in Bratislava, PyCon SK 2020 conference is a yearly gathering of the community developing and using the open-source Python programming language. This event is organized by volunteers from the SPy o.z., civic association dedicated to promoting and advancing Python and other Open Source technologies and ideas. Through PyCon, the SPy o.z. advances its mission of growing not only the Slovak but also the international community of Python programmers and Open Source supporters. There will also be an EduSummit which is a special section of the conference focused on teaching programming at primary and secondary schools. This fourth edition is a two-day summit during which teachers will be introduced to innovative methods and ways of teaching programming, share their knowledge of useful tools and participate in various workshops given by experienced educators.