jupyter progress bar

import time, sys
import IPython.display

class ProgressBar(object):
    """Replace existing contents of the current output cell with a progress bar.
    """
    def __init__(self, maxval=1., label='Progress', width=40):
        self.maxval = maxval
        self.label = label
        self.width = width
        self.start_at = time.time()
        self.update(0.)
    def update(self, value):
        elapsed = int(round(time.time() - self.start_at))
        mins = elapsed // 60
        secs = elapsed % 60
        timing = '{mins}m{secs:02d}s'.format(mins=mins, secs=secs)
        frac = value / self.maxval
        ndone = int(round(frac * self.width))
        bar = '#' * ndone + '-' * (self.width - ndone)
        text = '{label}: [{bar}]{pct:5.1f}% {timing}'.format(
            label=self.label, bar=bar, pct=100 * frac, timing=timing)
        IPython.display.clear_output(wait=True)
        print(text)