$ sudo pip install Flask  

$ sudo pip install -r requirements.txt  

$ export FLASK_APP=cs3200.py  
$ export RDS_USERNAME=YOUR_RDS_USERNAME  
$ export RDS_PASSWORD=YOUR_RDS_PASSWORD  
$ export RDS_HOSTNAME=YOUR_RDS_ENDPOINT  
$ export RDS_PORT=YOUR_PORT  
$ export RDS_DB_NAME=YOUR_DATABASE_NAME  
$ export APP_MAIL_USERNAME=YOUR_GMAIL_ACCOUNT  
$ export APP_MAIL_PASSWORD=YOUR_GMAIL_PASSWORD    
$ flask run  

. run