[ Python 常見問題 ] Text Progress Bar in the Console

Source From Here 
Question 
As title. How to draw a progress bar for long time execution task in command line mode? 

How-To 
For a hand-made version: 

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1. # Print iterations progress  
2. def printProgressBar (iteration, total, prefix = '', suffix = '', decimals = 1, length = 100, fill = '█'):  
3.     """  
4.     Call in a loop to create terminal progress bar  
5.     @params:  
6.         iteration   - Required  : current iteration (Int)  
7.         total       - Required  : total iterations (Int)  
8.         prefix      - Optional  : prefix string (Str)  
9.         suffix      - Optional  : suffix string (Str)  
10.         decimals    - Optional  : positive number of decimals in percent complete (Int)  
11.         length      - Optional  : character length of bar (Int)  
12.         fill        - Optional  : bar fill character (Str)  
13.     """  
14.     percent = ("{0:." + str(decimals) + "f}").format(100 * (iteration / float(total)))  
15.     filledLength = int(length * iteration // total)  
16.     bar = fill * filledLength + '-' * (length - filledLength)  
17.     print('\r%s |%s| %s%% %s' % (prefix, bar, percent, suffix), end = '\r')  
18.     # Print New Line on Complete  
19.     if iteration == total:   
20.         print()  
21.   
22. #   
23. # Sample Usage  
24. #   
25.   
26. from time import sleep  
27.   
28. # A List of Items  
29. items = list(range(0, 57))  
30. l = len(items)  
31.   
32. # Initial call to print 0% progress  
33. printProgressBar(0, l, prefix = 'Progress:', suffix = 'Complete', length = 50)  
34. for i, item in enumerate(items):  
35.     # Do stuff...  
36.     sleep(0.1)  
37.     # Update Progress Bar  
38.     printProgressBar(i + 1, l, prefix = 'Progress:', suffix = 'Complete', length = 50)  

For a exist python package tqdm: add a progress meter to your loops in a second: 

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1. >>> import time  
2. >>> from tqdm import tqdm  
3. >>> for i in tqdm(range(100)):  
4. ...     time.sleep(1)  
5. ...  
6. 27%|██████████████████████████████████                                                                                            | 27/100 [00:36<01:18,  1.08s/it]