Use Python Flask to build an efficient and concise URL shortening service

1. Set up the Flask application

First, create a new directory for your project and open a terminal in that directory. Then, run the following command to create a new virtual environment for your project:

# For windows:
virtualenv venv
# For linux:
python3 -m venv venv

Activate the virtual environment by running the following command:

# For windows
venv/Scripts/activate
# For linux
source venv/bin/ activate

Next, install Flask by running the following command:

pip install Flask

Create a file named Create a new file for app.py and add the following code to set up a basic Flask application:

from flask import Flask, request, redirect
app = Flask(__name__)
@app.route('/')
def index():
    return 'Welcome to the URL Shortener'
if __name__ == '__main__':
    app.run(debug=True)

Run the following command to start the Flask development server:

python app.py

In your Visit http://localhost:5000 in your web browser to view the "Welcome to URL Shortener" message.

2. Store the URL in a dictionary

Next, we will store the original URL and its corresponding shortened URL in a Python dictionary. Add the following code to your app.py file:

url_map = {}
@app.route('/shorten', methods=['POST'])
def shorten_url():
    original_url = request.form['url']
    short_url = generate_short_url(original_url)
    url_map[short_url] = original_url
    return short_url
def generate_short_url(original_url):
    # Generate a unique short URL for the original URL
    # (We'll implement this in the next step)
    pass

3. Generate unique short URLs

To generate unique short URLs, we will use ha Greek function. A hash function takes an input (in this case, a raw URL) and returns a fixed-length output (a short URL). We will use the SHA-1 hash function, which is part of the Pythonhashlib library. Add the following code to your app.py file: The user is redirected to the original URL. Add the following code to your

app.py

file:

import hashlib
def generate_short_url(original_url):
    hash = hashlib.sha1(original_url.encode())
    short_url = hash.hexdigest()[:8]
    return short_url

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