5.2. Variables in Routes

Sometimes, you may want to pass information in the URL itself. Flask allows you to include variables in a route and then use them in your function.

Here’s an example where the URL includes a person’s name:

from flask import Flask

app = Flask(__name__)

@app.route("/hello/<name>")  # Route with a variable 'name'
def hello(name):
    return f"Hello, {name}!"

if __name__ == "__main__":
    app.run(debug=True, port=5000)

Let’s understand the hello decorator and function:

• The <name> part of the URL is a placeholder for any name that a user types in the URL.

• The value provided in the URL is passed to the hello()` function as a parameter, and Flask will embed that value in the response.

For example, if you go to http://127.0.0.1:5000/hello/Alice, the page will display "Hello, Alice!". If you visit http://127.0.0.1:5000/hello/Bob, it will display "Hello, Bob!".