def get_connection_string():    
    username = 'upload'
    password = 'quackquack'
    
    s = ("mongodb://<USERNAME>:<PASSWORD>@dt0-shard-00-00-npkyt.mongodb.net:27017,"
        "dt0-shard-00-01-npkyt.mongodb.net:27017,dt0-shard-00-02-npkyt.mongodb.net"
        ":27017/test?ssl=true&replicaSet=dt0-shard-0&authSource=admin")
    
    s = s.replace("<PASSWORD>", password)
    s = s.replace("<USERNAME>", username)
    return s