Six

Writing Python code that works the same in Python 2 & 3, using six as necessary.

six.moves.range

range xrange() range

six.reraise(exc_type, exc_value, exc_traceback=None) Reraise an exception, possibly with a different traceback. In the simple case, reraise(*sys.exc_info()) with an active exception (in an except block) reraises the current exception with the last traceback. A different traceback can be specified with the exc_traceback parameter. Note that since the exception reraising is done within the reraise() function, Python will attach the call frame of reraise() to whatever traceback is raised.

2to3 does raise E, V, T to raise E(V).with_traceback(T)