How to avoid conflict between progress bars and print functions when using Python's tqdm library?

Solution to the conflict between tqdm and print function in Python

When using Python's tqdm library to display progress bars, if you use print function to output information in a loop, it may cause the progress bar to be repeatedly printed, affecting the beauty of the interface. This article provides an effective solution.

Question example:

The following code snippet demonstrates the problem of the tqdm progress bar conflicting with the print function:

 import time
from tqdm import tqdm

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

Run this code and you will find that the progress bar is not refreshed on the same line, but is reprinted after each print , causing the interface to be confused.

Solution: Use environment variables to control debug mode

We can control whether debug mode is enabled by setting environment variables. In debug mode, turn off tqdm and directly use print function to output information; in non-debug mode, the tqdm progress bar is displayed normally.

Code example:

 import os
import time
from tqdm import tqdm

debug_mode = os.getenv('DEBUG') # Get the value of the environment variable DEBUG if debug_mode != '1':
    iterator = tqdm(range(100))
else:
    iterator = range(100)

for i in iterator:
    time.sleep(0.1)
    if debug_mode == '1':
        print(f"Iteration: {i}")

Run this code:

• Non-debug mode: If the environment variable DEBUG is not set or DEBUG is set to a non-'1' value, the tqdm progress bar will be displayed normally.
• Debugging mode: Set the environment variable DEBUG=1 , then the tqdm progress bar is closed, and print function outputs the iteration information of each step.

Through this method, the normal display of the progress bar can be ensured, and the debugging can be carried out easily, avoiding the conflict between the progress bar and print function.

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