how to import flask in python code example

Example 1: install flask

pip install flask

Example 2: install flask

pip install -U Flask

Example 3: import flask

from flask import Flask
app = Flask(__name__)

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

Example 4: how to import flask

from flask import Flask

app = Flask(__name__)

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