Two Examples of Progress Bars

A Javascript Progress Bar

Here is a simple progress bar using HTML/Javascript:

In [2]:
import uuid
import time
from IPython.display import HTML, Javascript, display

divid = str(uuid.uuid4())

pb = HTML(
"""
<div style="border: 1px solid black; width:500px">
  <div id="%s" style="background-color:blue; width:0%%">&nbsp;</div>
</div> 
""" % divid)
display(pb)
for i in range(1,101):
    time.sleep(0.1)
    
    display(Javascript("$('div#%s').width('%i%%')" % (divid, i)))

The above simply makes a div that is a box, and a blue div inside it with a unique ID (so that the javascript won't collide with other similar progress bars on the same page).

Then, at every progress point, we run a simple jQuery call to resize the blue box to the appropriate fraction of the width of its containing box, and voilĂ  a nice HTML/Javascript progress bar!

ProgressBar class

And finally, here is a progress bar class extracted from PyMC, which will work in regular Python as well as in the IPython Notebook

In [3]:
from __future__ import print_function
import sys, time

class ProgressBar:
    def __init__(self, iterations):
        self.iterations = iterations
        self.prog_bar = '[]'
        self.fill_char = '*'
        self.width = 50
        self.__update_amount(0)

    def animate(self, iter):
        print('\r', self, end='')
        sys.stdout.flush()
        self.update_iteration(iter + 1)

    def update_iteration(self, elapsed_iter):
        self.__update_amount((elapsed_iter / float(self.iterations)) * 100.0)
        self.prog_bar += '  %d of %s complete' % (elapsed_iter, self.iterations)

    def __update_amount(self, new_amount):
        percent_done = int(round((new_amount / 100.0) * 100.0))
        all_full = self.width - 2
        num_hashes = int(round((percent_done / 100.0) * all_full))
        self.prog_bar = '[' + self.fill_char * num_hashes + ' ' * (all_full - num_hashes) + ']'
        pct_place = (len(self.prog_bar) // 2) - len(str(percent_done))
        pct_string = '%d%%' % percent_done
        self.prog_bar = self.prog_bar[0:pct_place] + \
            (pct_string + self.prog_bar[pct_place + len(pct_string):])

    def __str__(self):
        return str(self.prog_bar)
In [4]:
p = ProgressBar(1000)
for i in range(1001):
    time.sleep(0.002)
    p.animate(i)