math.modf() returns a tuple.

```
What steps will reproduce the problem?
1. put a number on the stack
2. call modf

What is the expected output? What do you see instead?
It should have two numbers replacing the single number, instead the stack print 
out fails.


```

Original issue reported on code.google.com by `forman.s...@gmail.com` on 7 Dec 2014 at 5:40
