Write growing percentage on standard output

percentage_output.py

#!/usr/bin/env python3                                                                                                 
"""Percentage output."""                                                                                               
count = 0                                                                                                              
items_nb = 500000                                                                                                      
                                                                                                                       
while True:                                                                                                            
    # You can replace .0f by .2f to output decimals                                                                    
    print(f'{count * 100 / items_nb:.0f}%', end='\r')                                                                  
    count += 1                                                                                                         
    if count == items_nb:                                                                                              
        print('')                                                                                                      
        break