1. Install pip
sudo apt-get install python3-dev
sudo apt install python3-pip
2. Install the tool virtualenv
sudo apt-get install python-virtualenv
3. Create a virtual environment using virtualenv tool, and active and the folder will appear in a folder venv
virtualenv -p /usr/bin/python3 py3env
. py3env/bin/activate
4. Installation flask pip
pip3 install flask
5. Create hello.py
Creating hello.py, as follows, located py3env folder
`from flask import Flask
app = Flask(name)
@app.route("/")
def hello():
return “hello world”
if name == “main”:
app.run()`
6 Use flask
export FLASK_APP=hello.py
export FLASK_ENV=development
flask run
