Python Progress Bar

Question

How do I use a progress bar when my script is doing some task that is likely to take time?

For example, a function which takes some time to complete and returns

Answer 1

@Massagran: It works well in my programs. Furthermore, we need to add a counter to indicate the loop times. This counter plays as the argument of the method update. For example: read all lines of a test file and treat them on something. Suppose that the function dosth() do not concern in the variable i.

lines = open(sys.argv[1]).readlines()
i = 0
widgets=[Percentage(), Bar()]
pbar = ProgressBar(widgets=widgets,maxval=len(lines)).start()
pbar.start()
for line in lines:
    dosth();
    i += 1
    pbar.update(i)
pbar.finish()

The variable i controls the status of pbar via the method update