[CentralOH] Balance Parentheses Error Messages

[jep200404 at columbus.rr.com]

On Mon, 17 Nov 2014 10:52:06 -0500, Joe Shaw <joe at joeshaw.org> wrote:

>        print "{}: Unclosed opening paren somewhere".format(s)

That begs for a stack of unmatched left parentheses 
(and their positions). 

Hmmm, The stack would have _just_ the positions.