Display percentage of process to on one line of stdout in python

cli_percentage.py

object_list_length = len(ObjectList)

for i, object in enumerate(ObjectList):
    percentage = int(((i + 1) * 100 / object_list_length))
    percent_str = ""
    for k in range(0, int(percentage / 5)):
        percent_str += ":"
    sys.stdout.write("\r%s  -- %s | %s %% %s " % (str(i + 1), 
                                                  str(object_list_length), 
                                                  str(percentage), 
                                                  percent_str)
    )
    sys.stdout.flush()