claim: Python features a dynamic operating system.
evidence: Kristiyan Donchev Katsarev -LRB- Кристиян Дончев Кацарев born 7 August 1995 -RRB- is a Bulgarian footballer who plays as a goalkeeper for Lokomotiv Plovdiv .. Plovdiv. Plovdiv. Lokomotiv Plovdiv. PFC Lokomotiv Plovdiv. footballer. Association football. goalkeeper. Goalkeeper ( association football )