Implementing Dynamic Progress Bars in Python: Using tqdm, Manual Methods, and Various Libraries

Creating a dynamic progress bar in the command line is a common requirement for long‑running Python tasks. You can use the convenient tqdm library or build a simple one from scratch with the standard sys and time modules.

Using the tqdm library

Install tqdm with pip install tqdm and create a progress bar as follows:

from tqdm import tqdm
import time

total_iterations = 100
for i in tqdm(range(total_iterations), desc="Progress", unit="it"):
    time.sleep(0.1)

Manual implementation

Define an update_progress function that calculates the percentage, builds an arrow and spaces, and writes the bar to sys.stdout using a carriage return. Example code:

import sys
import time

def update_progress(progress, total, bar_length=40):
    percent = float(progress) / total
    arrow = '=' * int(round(percent * bar_length) - 1) + '>'
    spaces = ' ' * (bar_length - len(arrow))
    sys.stdout.write(f"\rProgress: [{arrow}{spaces}] {int(percent * 100)}%")
    sys.stdout.flush()

total_iterations = 100
for i in range(total_iterations + 1):
    update_progress(i, total_iterations)
    time.sleep(0.1)
print("\nTask completed!")

Custom colored progress bar with colorama

Install colorama ( pip install colorama ) and modify the update function to add ANSI colors:

import sys
import time
from colorama import Fore, Style, init
init(autoreset=True)

def update_progress(progress, total, bar_length=40):
    percent = float(progress) / total
    arrow = Fore.GREEN + '=' * int(round(percent * bar_length) - 1) + '>' + Style.RESET_ALL
    spaces = ' ' * (bar_length - len(arrow) + 1)
    sys.stdout.write(f"\r{Fore.CYAN}Progress: [{arrow}{spaces}] {int(percent * 100)}%{Style.RESET_ALL}")
    sys.stdout.flush()

total_iterations = 100
for i in range(total_iterations + 1):
    update_progress(i, total_iterations)
    time.sleep(0.1)
print(f"\n{Fore.GREEN}Task completed!{Style.RESET_ALL}")

tqdm with color

tqdm supports colored bars via the colour argument:

from tqdm import tqdm
import time

total_iterations = 100
for i in tqdm(range(total_iterations), desc="Progress", unit="it", ncols=100, colour="green"):
    time.sleep(0.1)

Using the rich library

Install rich ( pip install rich ) and display a progress bar with track :

from rich.progress import track
import time

total_iterations = 100
for i in track(range(total_iterations), description="Processing..."):
    time.sleep(0.1)

Using alive‑progress

Install alive‑progress ( pip install alive-progress ) and use alive_bar :

from alive_progress import alive_bar
import time

total_iterations = 100
with alive_bar(total_iterations, title='Processing', bar='blocks') as bar:
    for i in range(total_iterations):
        time.sleep(0.1)
        bar()

Using click

Install click ( pip install click ) and create a progress bar:

import click
import time

total_iterations = 100
with click.progressbar(range(total_iterations), label='Processing') as bar:
    for i in bar:
        time.sleep(0.1)

Using progressbar2

Install progressbar2 ( pip install progressbar2 ) and configure widgets:

import progressbar
import time

total_iterations = 100
widgets = [progressbar.Bar('=', '[', ']'), ' ', progressbar.Percentage()]
bar = progressbar.ProgressBar(maxval=total_iterations, widgets=widgets).start()
for i in range(total_iterations):
    time.sleep(0.1)
    bar.update(i + 1)
bar.finish()

Combining colorama with custom ASCII art

Install colorama and create a colored ASCII‑art bar similar to the manual implementation, using Fore.GREEN and Style.RESET_ALL for colors.

import sys
import time
from colorama import Fore, Style, init
init(autoreset=True)

def update_progress(progress, total, bar_length=40):
    percent = float(progress) / total
    arrow = Fore.GREEN + '█' * int(round(percent * bar_length) - 1) + '>' + Style.RESET_ALL
    spaces = ' ' * (bar_length - len(arrow) + 1)
    sys.stdout.write(f"\r{Fore.CYAN}Progress: [{arrow}{spaces}] {int(percent * 100)}%{Style.RESET_ALL}")
    sys.stdout.flush()

total_iterations = 100
for i in range(total_iterations + 1):
    update_progress(i, total_iterations)
    time.sleep(0.1)
print(f"\n{Fore.GREEN}Task completed!{Style.RESET_ALL}")

Using pyfiglet with tqdm

Install pyfiglet ( pip install pyfiglet ) to print ASCII art, then run a colored tqdm bar:

from tqdm import tqdm
import time
import pyfiglet

print(pyfiglet.figlet_format("Processing"))

total_iterations = 100
for i in tqdm(range(total_iterations), desc="Progress", unit="it", ncols=100, colour="green"):
    time.sleep(0.1)
print("Task completed!")

These examples demonstrate multiple ways to add informative, colorful, and customizable progress indicators to Python command‑line applications.