Flask で Hello World

プログラム

hello.py

from flask import Flask

app = Flask(__name__)

@app.route('/')
def index():
	str_out = '<h2>こんにちは!</h2>'
	str_out += '<p>Aug/15/2023</p>'
	return str_out

app.run(host='0.0.0.0')

実行

python hello.py

実行した時の様子

$ python hello.py
 * Serving Flask app 'hello'
 * Debug mode: off
WARNING: This is a development server. Do not use it in a production deployment. Use a production WSGI server instead.
 * Running on all addresses (0.0.0.0)
 * Running on http://127.0.0.1:5000
 * Running on http://192.168.1.6:5000
Press CTRL+C to quit

クライアントでアクセス

http://127.0.0.1:5000/

確認したバージョン

$ flask --version
Python 3.12.3
Flask 3.0.2
Werkzeug 3.0.1