The comma operator creates tuples in Python (the surrounding braces actually don't do anything):
sage: 1, 2, 3 (1, 2, 3) sage: 1, (1,) A function that just prints something but doesn't call return() will return None. That should make the output clear: sage: def comma(): ....: print "*" ....: sage: comma(), * (None,) sage: comma() * sage: print comma() * None -- To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URL: http://www.sagemath.org
