python -m venv attaa   
source attaa/bin/activate       

pip install flask gunicorn   

from flask import Flask             
app = Flask(__name__)               

@app.route("/")                   
def hello():                     
   return "Hello World!"          
 
if __name__ == "__main__":          
   app.run(debug=True)               

python app.py   

 brew tap heroku/brew && brew install heroku  

pip freeze > requirements.txt   

web: gunicorn app:app   

heroku login   

git init  
heroku git:remote -a app-attaa   

git add .   
git commit -am "make it better"   
git push heroku master    

conda deactivate

deactivate