if charset and bytes is not str and isinstance(s, bytes): # Python3
s = s.decode(charset, "replace")
if not isinstance(s, bytes):
s = s.encode(g.default_encoding, "replace")
if charset and bytes is not str and isinstance(s, bytes): # Python3
s = s.decode(charset, "replace")
if not isinstance(s, bytes):
s = s.encode(g.default_encoding, "replace")