Python/Flask

Installation

## Linux / macOS
mkdir myproject
cd myproject
# python3 -m venv .flask
python3 -m venv .venv
. .venv/bin/activate

## Windows
mkdir myproject
cd myproject
py -3 -m venv .venv
.venv\Scripts\activate

## Next Common Step
# pip install Flask
pip3 install Flask

# End
deactivate

References:

• https://flask.palletsprojects.com/en/stable/installation/

Quick Start

Hello World

helloworld.py

from flask import Flask

app = Flask(__name__)

@app.route("/")
def hello_world():
    return "<p>Hello, World!</p>"

Run the server:

flask --app helloworld run

WARNING: This is a development server. Do not use it in a production deployment. Use a production WSGI server instead.

Note:

* Running on http://127.0.0.1:5000

Test the server:

curl http://127.0.0.1:5000

Hello, World!

References:

• https://flask.palletsprojects.com/en/stable/quickstart/