Minumum Flask Heroku Application

Simplest way to create minumum flask application on heroku using Python 3.5.2

Getting Started

Install python 3.5.2

Steps

Create Folder

$ mkdir heroku-application

Get into created folder

$ cd heroku-application/

Create folder for application itself inside heroku-application

$ mkdir heroku_app

Create init file

$ touch heroku_app/__init__.py

Add following to init file

from flask import Flask

app = Flask(__name__)
app.debug = True

from heroku_app import views

Create views file

$ touch heroku_app/views.py

Add following to views file

from heroku_app import app

@app.route('/')
@app.route('/index')
def index():
	return "Hello World";

Create run.py inside heroku-application folder

$ touch run.py

Add following to run.py

from heroku_app import app
import os

if __name__ == '__main__':
	port = int(os.getenv('PORT', 8080)) 
	host = os.getenv('IP', '0.0.0.0') 
	app.run(port=port, host=host)

Create Procfile inside heroku-application folder

$ touch Procfile

Add following to Procfile

web: python run.py

Create runtime.txt inside heroku-application folder

$ touch runtime.txt

Add following text to runtime.txt

python-3.5.2

$ python3 -m venv flask
$ . flask/bin/activate
$ pip install flask
$ pip freeze > requirements.txt

Test Locally

$ python run.py

Visit http://0.0.0.0:8080/ if no error then continue

Ctrl + C

Setup Heroku

$ heroku login
$ heroku create your-app-name
$ git init .
$ git add .
$ git commit -m "Hello World"
$ heroku git:remote -a your-app-name
$ git push heroku master
$ heroku open

Done