Progress bar function in Python

progress_bar.py

def update_progress(progress):
    print '\r{1}%[{0}] '.format('#' * (progress/2), str(progress).zfill(2)),

# Useage
data = []
count = 0.0
total = len(data)
print 'Starting...'

# iterate over something and update count
  for i in data
  ...
  update_progress(int((count/total)*100))