flask version code example

Example 1: install flask

pip install flask

Example 2: install flask

pip install -U Flask

Example 3: Install Flask

pip install flask
Or If The Problem is "pip" not Found Use : 
py -m pip install flask

Example 4: import flask

from flask import Flask
app = Flask(__name__)

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

Example 5: default flask app

from flask import Flask
app = Flask(__name__)

@app.route('/')
def index():
    return 'Flask'

Example 6: flask install venv

python -3 -m venv venv