Date	Author	Version	Note
2024.02.28	Dog Tao	V1.0	Release the note.

A Brief Introduction of the Tqdm Module in Python

Introduction

Tqdm is a versatile Python library that provides a fast, extensible progress bar for loops and other iterable processes. The name tqdm is derived from the Arabic word “taqaddum” (تقدّم), meaning “progress,” and is pronounced as “ta-qe-dum.” Its simplicity and efficiency have made it a go-to choice for adding progress indicators to Python code, especially in data processing, file I/O, and long-running computations.

Key Features

• Easy to Use: Tqdm can be added to your loops with minimal code changes, instantly providing visual feedback on the progress.
• Highly Customizable: While simple to implement with default settings, tqdm also offers a wide range of customization options, including custom messages, progress bar formatting, and manual control over the progress updates.
• Lightweight with Minimal Dependencies: It is designed to be lightweight and requires no heavy dependencies, making it suitable for various projects.
• Versatile: Works with loops, iterable objects, and can even be used to track progress in pandas operations with tqdm.pandas().

Installation

• Using pip

To install tqdm using pip, open your terminal (or command prompt/PowerShell in Windows) and run the following command:

pip install tqdm

If you are working in a virtual environment (which is recommended to avoid conflicts between different projects), make sure it is activated before running the pip install command.

• Using conda

To install tqdm using conda, you should have Anaconda or Miniconda installed on your system. Open your Anaconda Prompt (or terminal in Linux/macOS) and run the following command:

conda install -c conda-forge tqdm

Using the -c conda-forge flag specifies that conda should install tqdm from the conda-forge channel, which is a community-maintained collection of conda packages.

Usage Examples

Basic Usage

The most common use of tqdm is to wrap it around any iterable in a for loop.

from tqdm import tqdm
import time

for i in tqdm(range(1000)):
    # Simulated task
    time.sleep(0.001)

The output example:

Advanced Usage

• Customization: You can customize the progress bar with various parameters such as desc (description), total, leave, ncols (width), unit, and more.

for i in tqdm(range(100), desc="Loading", ascii=False, ncols=75):
    time.sleep(0.01)

• Manual Updates: For tasks that don’t fit neatly into a loop, tqdm can be manually updated.

pbar = tqdm(total=100)
for i in range(10):
    time.sleep(0.1)
    pbar.update(10)  # Manually update the progress bar by 10
pbar.close()

The output example:

• Integration with Pandas: Tqdm can be integrated with Pandas operations using tqdm.pandas(). This is particularly useful for applying functions to DataFrame columns or rows and visualizing the progress.

import pandas as pd
from tqdm import tqdm
tqdm.pandas()

df = pd.DataFrame({'x': range(10000)})
df['y'] = df['x'].progress_apply(lambda x: x**2)

The output example:

• Working with Concurrent Futures: Tqdm can also be used with concurrent programming modules like concurrent.futures for tracking the progress of asynchronous tasks.

from concurrent.futures import ThreadPoolExecutor, as_completed

with ThreadPoolExecutor(max_workers=5) as executor:
    futures = [executor.submit(time.sleep, 0.1) for _ in range(100)]
    for f in tqdm(as_completed(futures), total=len(futures)):
        pass

The output example:

Tqdm’s simplicity, combined with its powerful features, makes it an invaluable tool for enhancing the user experience in command-line applications and Jupyter notebooks by providing clear and customizable progress indications.