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Flask Tutorial - Hello World

📅 2026-06-12 | 📂 Flask

Flask Hello World

from flask import Flask
app = Flask(__name__)

@app.route("/")
def hello():
    return "Hello, World!"

app.run(debug=True)

Routes

@app.route("/user/<name>")
def user(name):
    return f"Hello, {name}!"

@app.route("/api/data", methods=)
def data():
    return {"status": "ok"}

Summary

Flask is a micro web framework
@app.route() defines URL routes