How do I read environment variables and stop gunicorn if not found

[ayushidalmia]

Currently I am doing the following:

path = os.environ.get('DATABASE_PATH')
if path==None:
    print "SET DATABASE_PATH, using --env key=value"   
    sys.exit()

api = falcon.API(middleware=[cors.middleware])

And when I run, I run as follows:
gunicorn app:api --env "DATABASE_PATH=some path"

However, if I don't give the path, the gunicorn server does not stop on it's own but keeps running like the following:

How do I stop the server?

[rupak-technicise]

it may help

1. to exit process----clt+z
2. to see how many server is running------ ps -ef|grep "gunicorn"
3. then to kill the server-----sudo kill -9 2303 (server-2303 )