python import flask code example

Example 1: import flask

from flask import Flask
app = Flask(__name__)

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

Example 2: install flask in venv

$ pip install Flask

Example 3: how to import flask

from flask import Flask

app = Flask(__name__)

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