I haven't been able to find a way to encode a bytes object in hexadecimal, where in Python 2.x I'd go "str.encode('hex')". I recommend adding a bytes.tohex() method (in the same vein as the existing bytes.fromhex class method). I've attached a patch which adds this method to the bytes and bytearray classes (in the C code). Also included documentation and test cases. Style note: The bytesobject.c and bytearrayobject.c files are all over the place in terms of tabs/spaces. I used tabs in bytesobject and spaces in bytearrayobject, since those seemed to be the predominant styles in either file. Commit log: Added "tohex" method to bytes and bytearray objects. Also added documentation and test cases.