Flask framework for Python Web Development

Welcome everyone, to a comprehensive Flask tutorial. Today, we’ll delve into the fundamentals of Flask, the Python web framework that empowers developers to build robust web applications. Let’s get started with a step-by-step guide.

Step 1: Installation

Ensure Python is installed on your system. Execute the following command to install Flask:

pip install Flask

Step 2: Creating Your First Flask App

Open your preferred text editor and create a file named app.py. Insert the following code:

from flask import Flask

app = Flask(__name__)

@app.route('/')
def hello_world():
return 'Hello, Flask World!'

if __name__ == '__main__':
app.run(debug=True)

Run the application with:

python app.py

Visit http://127.0.0.1:5000/ to see your first Flask application in action.

Step 3: Exploring Routes

Flask uses routes to map URLs to functions. Let’s create a new route:

@app.route('/about')
def about():
return 'About Us: Learn more about our Flask application.'

Access http://127.0.0.1:5000/about to explore this new route.

Step 4: Adding Dynamic Content

Flask supports dynamic content through templates. Create a folder named templates and add a file called index.html:

<!DOCTYPE html>
<html>
<head>
<title>Flask Tutorial</title>
</head>
<body>
<h1>{{ message }}</h1>
</body>
</html>

Modify app.py to render this template:

from flask import render_template

# ... (previous code)

@app.route('/dynamic')
def dynamic():
return render_template('index.html', message='Welcome to the Flask Tutorial!')

# ... (remaining code)

Visit http://127.0.0.1:5000/dynamic to see dynamic content in action.

Conclusion

Congratulations! You’ve completed a foundational Flask tutorial. This is just the beginning of your journey into web development with Python. Stay tuned for more advanced topics and best practices as you continue to hone your skills.

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