Simple progress bar in Python

progressbar.py

import time
import sys

def update_progress(progress):
    progress = round(progress*100, 1)
    barLength = 20
    block = int(round(barLength*progress/100))
    text = "\rProgress: [{0}] {1}%".format( "#"*block + "-"*(barLength-block), progress)
    sys.stdout.write(text)
    sys.stdout.flush()

print "Starting work..."

for i in range(151):
    time.sleep(0.05)
    update_progress(i/150.0)

print "\nDone."