How to avoid duplicate progress bar problems caused by print in tqdm in Python?

Cleverly resolve conflicts between Python tqdm progress bar and print statement

When using the tqdm library to display progress bars in Python, if you use print function to output information in the loop, the problem of repeated display of progress bars may occur. This is because tqdm updates the progress bar by constantly refreshing the same line of text, while print function will output line breaks, resulting in tqdm not being refreshed correctly, resulting in unnecessary progress bars.

The following code demonstrates this problem:

 import time
from tqdm import tqdm

for i in tqdm(range(100)):
    time.sleep(0.1)
    print(i)

To avoid this problem and retain the convenience of printing other information below the progress bar, we can use environment variables to control the display of the progress bar:

 import os
import time
from tqdm import tqdm

debug_mode = os.getenv('DEBUG')

iterable = tqdm(range(100)) if debug_mode != '1' else range(100)

for i in iterable:
    time.sleep(0.1)
    if debug_mode == '1':
        print(i)

By setting the environment variable DEBUG , we can flexibly switch the display status of the progress bar. When DEBUG is not equal to '1', use tqdm to display the progress bar; when DEBUG is equal to '1', disable tqdm , use range directly, and output information through print . This method not only avoids the repetition of progress bars, but also facilitates debugging and viewing detailed information.

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