File Path Function Arguments
A Pygame function or method which takes a file path argument will accept either an Unicode or a byte — 8-bit or ASCII character — string. Unicode strings are translated to Python's default file system encoding, as returned by sys.getfilesystemencoding(). An Unicode code point above U+FFFF — 'uFFFF' — can be coded directly with a 32-bit escape sequences — 'Uxxxxxxxx' — , even for Python interpreters built with an UCS-2 (16-bit character) unicode type. Byte strings are passed to the operating system unchanged.
Null characters — 'x00' — are not permitted in the path, raising an exception. An exception is also raised if an Unicode file path cannot be encoded. How UTF-16 surrogate codes are handled is Python interpreter dependent. Use UTF-32 code points and 32-bit escape sequences instead. The exception types are function dependent.