Writing Python code that works the same in Python 2 & 3, using six as necessary.
range xrange() range
six.reraise(exc_type, exc_value, exc_traceback=None)
Reraise an exception, possibly with a different traceback. In the simple case,
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)