 The prefix <unk> is used to show that something is related to Python . Examples of the use of this prefix in names of Python applications or libraries include <unk> , a binding of SDL to Python ( commonly used to create games ) ; <unk> , an implementation for the Symbian S60 operating system ; <unk> and <unk> , which bind <unk> and GTK , respectively , to Python ; and PyPy , a Python implementation originally written in Python . 
