Flask Basics
Flask is a lightweight web framework for building web applications and APIs. It is minimalistic but extensible, making it perfect for small projects and microservices.
Installation
`pip install flask`
Hello World App
Create a `app.py` file.
from flask import Flask
app = Flask(__name__)
@app.route('/')
def hello():
return "Hello, World!"
if __name__ == "__main__":
app.run(debug=True)
Routes and Variables
Capture URL variables.
@app.route('/user/')
def user(name):
return f"Hello, {name}!"
HTTP Methods
Specify methods for a route.
@app.route('/submit', methods=['POST'])
def submit():
data = request.json
return {"received": data}
Templates (Jinja2)
Return HTML templates with variables.
from flask import render_template
@app.route('/hello/')
def hello_name(name):
return render_template("hello.html", name=name)
Flask is a great starting point for learning web development with Python.
Two Minute Drill
- Flask is a micro‑web framework.
- Define routes with `@app.route`.
- Return strings, JSON, or render templates.
- Use `request` to access incoming data.
- Run with `python app.py`.
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