console progress in python

progress.py

#!/usr/bin/env python
import os
import sys


class Progress:
    def __init__(self, fillchar='#', width=80):
        self.fillchar = fillchar
        self.width = width

    def update(self, percent, info=''):
        length = self.width
        percent_str = str(int(round(percent))) + '% '
        length -= len(percent_str)
        if info:
            info = ' ' + info
            length -= len(info)
        if length <= 2:
            raise Exception('info is too long!')
        length -= 2
        fill_length = int(percent / 100.0 * length)
        progress = '[{0:{1}}]'.format(self.fillchar * fill_length, length)
        if sys.platform.startswith('win'):
            os.system('cls')
        sys.stdout.write('{}{}{}'.format(percent_str, progress, info))
        sys.stdout.write('\n' if percent == 100.0 else '\r')
        sys.stdout.flush()

if __name__ == '__main__':
    import time
    p = Progress()
    for i in range(0, 100 + 1, 10):
        p.update(float(i), 'Hello progress!')
        time.sleep(0.2)