Flask is a lightweight and flexible Python web framework that provides simple tools and libraries for building web applications. It is often referred to as a micro-framework because it does not require any particular tools or libraries to function, allowing developers to choose the components they need for their project.
In this tutorial, we will provide a brief introduction to Flask and show you how to get started with building your web applications using this framework.
- Setting up Flask:
The first step in getting started with Flask is to install it using pip, Python’s package installer. You can do this by running the following command in your terminal:
pip install FlaskOnce Flask is installed, you can create a new Flask application by creating a Python file and importing the necessary modules. Here’s a simple example of a Flask application that displays a basic "Hello, World!" message:
from flask import Flask
app = Flask(__name__)
@app.route('/')
def hello_world():
return 'Hello, World!'
if __name__ == '__main__':
app.run()Save this code in a file named app.py and run it in your terminal using the following command:
python app.pyYou should see a message in your terminal indicating that the Flask development server is running. You can access your Flask application by opening a web browser and navigating to http://localhost:5000.
- Routing in Flask:
One of the key features of Flask is its routing system, which allows you to define the URLs that your application will respond to. In the example above, the route decorator @app.route('/') is used to define the route / that will be handled by the hello_world function.
You can define additional routes by adding more route decorators to your functions. For example:
@app.route('/about')
def about():
return 'About Us'This will create a new route /about that will display an "About Us" message when accessed.
- Templates in Flask:
Flask also supports the use of templates to dynamically generate HTML content for your web pages. You can use the Jinja2 template engine, which is included with Flask, to create templates for your application.
Create a new directory named templates in your project folder and add a new HTML file named index.html with the following content:
<!DOCTYPE html>
<html>
<head>
<title>Hello, World!</title>
</head>
<body>
<h1>Hello, World!</h1>
</body>
</html>Modify your hello_world function to render this template:
from flask import Flask, render_template
app = Flask(__name__)
@app.route('/')
def hello_world():
return render_template('index.html')
if __name__ == '__main__':
app.run()Now, when you access your application in the browser, you will see the content of the index.html template rendered on the page.
- Handling Form Data:
Flask also provides tools for handling form data submitted by users. You can access form data using the request object, which is provided by Flask. For example, you can create a simple form that allows users to submit their names:
<!DOCTYPE html>
<html>
<head>
<title>Form Example</title>
</head>
<body>
<form action="/" method="post">
<input type="text" name="name" placeholder="Enter your name">
<input type="submit" value="Submit">
</form>
</body>
</html>Modify your Flask application to handle this form data:
from flask import Flask, render_template, request
app = Flask(__name__)
@app.route('/', methods=['GET', 'POST'])
def hello_world():
if request.method == 'POST':
name = request.form['name']
return f'Hello, {name}!'
return render_template('form.html')
if __name__ == '__main__':
app.run()Now, when users submit the form on your web page, the hello_world function will retrieve the submitted data and display a personalized greeting.
In this tutorial, we have covered the basic concepts of Flask, including setting up a new Flask application, defining routes, using templates, and handling form data. Flask is a powerful and versatile framework that can be used to build a wide range of web applications, from simple static sites to complex dynamic applications. We encourage you to explore the Flask documentation and experiment with different features to see what you can create with this powerful framework.
What can I do to make future videos better? Any criticism is greatly appreciated!
Very nice. Covered the basics in a very very short time. Keep it up.
Cool.
Perfeito!
thank you
Merci de m’avoir aider ❤❤
make the video slower, I can't understand something the I'm unfamiliar with that fast. Also, speak loud an clear, you sound like you are whispering.
Thanks alot, I loved it,
and the way it is made, and the effort
And I know some people just like flies, look at the bad,
And will say … replicating Fireship
for them I say, : Firstly, almost there is No genuine ides,
Secondly, Fireship is absolutely doing like another one with his own way and this guy here is doing great,
Thirdly, Please, if you have something good to say, say it, if not Stop
Lastly<… Thnaks brother,
Loay from Egypt,
And not to misquote, the quote actually says; """Whoever believes in Allah <<God in English, elah, or elohim in hebew, … ALLAH in Arabic or the language of Jeses peace be upon him>> and the Last Day, let him speak goodness or remain silent."""" Says, Muhammad (peace be upon him)
dude talks like a 🐦
nice quick overview video!
exactly what i wanted – but didnt expect to find.
Thanks for the video! As someone said below it was exactly what I was looking for (I wanted a TLDR on Flask) and as another person said below my only criticism is you can definitely speak louder 😀
This is amazing
I appreciate the Fireship-style video. This is exactly what I was looking for!
too fast and not useful
this is better than CS50x's lecture on flask in many redgards
The video was probably helpful but I was extremely distracted by the whispering. Please, for the love of god, speak like I'm in the room with you, not like you're whispering in my ear.
FWIW, I was a sound recordist for about 12 years. Film, tv, music. It would be wise to take this advice.
Flask is a great backend framework IMO. Super simple, great for hobby projects.
I'm taking a class on this right now! 😀
Prety Kool.
You are underrated af my guy, these videos are pretty damn good!