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

a little more generic answer of jelde015 (credit to him of course)

for updating the loading bar manually will be:

import sys
from math import *


def loadingBar(i, N, size):
    percent = float(i) / float(N)
    sys.stdout.write("\r"
                     + str(int(i)).rjust(3, '0')
                     +"/"
                     +str(int(N)).rjust(3, '0')
                     + ' ['
                     + '='*ceil(percent*size)
                     + ' '*floor((1-percent)*size)
                     + ']')

and calling it by:

loadingBar(7, 220, 40)

will result:

007/220 [=                                       ]  

just call it whenever you want with the current i value.

set the size as the number of chars the bar should be