File loops

Hi Burt, 

If you have a chance, can you check the code that I've written in the "test.py" file? I still cannot properly fill a histogram, but I can't figure out why the code that I've written isn't working (tried reading ROOT documentation pages already...and the problem is definitely in the variable.Fill line...I've tried running the code line by line to identify exactly where the problem is...)

Thanks!
~Christi