Class data being zapped by method

[Bruno Desthuilliers]

Simon Forman wrote:
(snip)
> Not that this has anything to do with your actual question, but there
> are a number of small details that I noticed while reading your code:
> 
> 
> 2.) Reading lines from a file is better done like so:
> 
> arrLines = open('datafiles/'+filename+'.tabdata').readlines()

Actually, it's better done like so:

fpath = os.path.join('datafiles', filename + ".tabdata")
f = open(fpath)
try:
  process_opened_file(f)
finally:
  f.close()