Take a look at this recipe which is part of the latest Python Cookbook. I think it will help you.
http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/299207 Larry Bates Jeffrey E. Forcier wrote: > This is a difficult issue to search for, and Googling (and reviewing > the pertinent Python docs) has not found me anything useful. It's also > not a super important issue, but regardless of whether it's avoidable, > I still want to know what the heck is going on. > > Doing multiple print statements inside a for loop, using the 'comma at > the end eats the newline' variant, results in zero output until the > loop completes its entire iteration. > > def test(): > print "testing:", > for x in range(10): > time.sleep(1) > print ".", > print "done." > > Executing test() results in the behavior described above. If one > removes the commas after the first two print statements, it behaves > normally, with "testing" showing up right away, then a period on each > newline every second until the end. > > I've tried various things--os.system('sleep 1') instead of > time.sleep(1), sys.stdout.write() instead of print-with-a-comma, and > other equally silly tactics, to no avail. > > What's going on here? > > Thanks, > Jeff > -- http://mail.python.org/mailman/listinfo/python-list
