Printing an updating line of text to stdout.

progress_timer.py

"""Updating timer that shows progress."""
import time

i = 0
while i < 1:
    print("Completed: {:6.2%}".format(i), end='\r', flush=True)
    i += 1/10000       # update by 1 permil
    time.sleep(1/1000) # 1 ms

print()