rsplit(s, sep=None, maxsplit=-1)
rsplit(s [,sep [,maxsplit]]) -> list of strings
Return a list of the words in the string s, using sep as the delimiter string, starting at the end of the string and working to the front. If maxsplit is given, at most maxsplit splits are done. If sep is not specified or is None, any whitespace string is a separator.