python progress bar for terminals

progress_bar.py

import sys


def drawProgressBar(percent_done, barLength = 40):
    """Display an updating progress bar in a terminal

    :percent_done: the percent done to display
    :barLength: how many chars long the bar is
    :returns: None

    """
    sys.stdout.write("\r")
    progress = ""
    for i in range(barLength):
        if i <= int(barLength * percent_done):
            if i+1 <= int(barLength * percent_done):
                progress += "="
            else:
                progress += ">"
        else:
            progress += " "
    sys.stdout.write("[%s] %.2f%%" % (progress, percent_done * 100))
    sys.stdout.flush()


def main():
    """Main function. Displays an example of progress bar

    :returns: None

    """
    for k in range(1,5):
        print("Processing Very Important item %d" % k)
        for i in range(50000):
            drawProgressBar(i/50000, 20)
            for j in range(1000):
                pass
        print()

# won't run if it's imported
if __name__ == '__main__':
    main()