''' Python 2.7 progress bar
Code mostly taken from:
   https://stackoverflow.com/questions/3173320/text-progress-bar-in-the-console

I usually use this for simple for loops with long iterations to make sure it's
actually progressing without polluting stdout.
'''
import sys


n_iterations = 100
bar_len = 60

# Assuming the loop always starts from 0
for iterations_done in range(0, n_iterations):
    filled_len = int(round(bar_len * (iterations_done + 1) /
                           float(n_iterations)))
    percents = round(100.0 * iterations_done / float(n_iterations), 1)
    bar = '=' * filled_len + '-' * (bar_len - filled_len)
    sys.stdout.write('[%s] %s%s, %d of %d\r' % (bar, percents, '%',
                                                iterations_done + 1,
                                                n_iterations))
    sys.stdout.flush()

    # Do stuff here

filled_len = bar_len
percents = 100.
bar = '=' * filled_len + '-' * (bar_len - filled_len)
sys.stdout.write('[%s] %s%s \r' % (bar, percents, '%'))
sys.stdout.flush()