f(x) returns a 2-tuple. This works fine under 0.4, but 0.5 reports the following. In [23]: sum,diff = f(1) ------------------------------------------------------------ File "<console>", line 1 sum(,diff = f(1)) ^ SyntaxError: invalid syntax -------> sum(,diff = f(1)) -- Jeffery Collins (http://www.boulder.net/~jcollins)