'str' object has no attribute 'rsplit'

[acbart]

I believe this was just a minor oversight, but there's no "rsplit" in the string class (Unless I missed something obvious).

https://docs.python.org/2/library/string.html#string.rsplit

[j-f1]

This could probably be implemented by splitting the string all the way, then joining together the first Math.min(arr.length - maxsplit, 0) elements of the array.