Python Flask Web Application
Prerequisites
Python v3.6+
Usually come the Ubuntu 18.04 by default. Check version:
$ python3 --version
Python 3.6.9To create alias python -> python3, use this commands:
$ sudo update-alternatives --install /usr/bin/python python $(command -v python3) 1
update-alternatives: using /usr/bin/python3 to provide /usr/bin/python (python) in auto modePip v3.6+
Install from package:
sudo apt-get update && sudo apt-get install python3-pip -yCheck version:
$ pip3 --version
pip 9.0.1 from /usr/lib/python3/dist-packages (python 3.6)Create alias pip -> pip3:
$ sudo update-alternatives --install /usr/bin/pip pip /usr/bin/pip3 1
update-alternatives: using /usr/bin/pip3 to provide /usr/bin/pip (pip) in auto modeVirtualenv
Install from pip:
sudo pip install virtualenvInitialize Project
Create a new project directory and initialize virtual environment:
virtualenv envActivate virtual environment:
source env/bin/activateInstall Flask
pip install flaskCreate app.py:
from flask import Flask
app = Flask(__name__)
@app.route('/')
def index():
return "Hello, World!"
if __name__ == "__main__":
app.run()Run the app:
python app.pyGo to http://127.0.0.1:5000/
