Here are some example simple blog using Flask.
# clone the repository into your local machine
$ git clone https://github.com/icoldplayer/flask.git
# move to flask directory
$ cd flask
# create your own virtual environment
$ python -m venv env
# then activate it
$ source env/bin/activate
# export your app
(env)$ export FLASK_APP=flask
# export environment mode
(env)$ export FLASK_ENV=development
# and run it.
(env)$ flask run
visit localhost:5000 on your browser, and you're ready to go.
That's all.