virtualenv flask code example

Example 1: install flask

pip install flask

Example 2: import flask

from flask import Flask
app = Flask(__name__)

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

Example 3: flask activ environment

. venv/bin/activate

Example 4: how to create a virtual enviorment with flask

$ flask run
  * Running on http://127.0.0.1:5000/ (Press CTRL+C to quit)