import os

py26 = r'C:\Python26\\'
py30 = r'C:\Python30\\'

textfile   = 'large.txt'
binaryfile = 'large.bin'

os.system('%s\python timeIO.py %s %s' % (py26, textfile, binaryfile))
os.system('%s\python timeIO.py %s %s' % (py30, textfile, binaryfile))