> For the complete documentation index, see [llms.txt](https://alfredo-reyes-montero.gitbook.io/tello-dji/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://alfredo-reyes-montero.gitbook.io/tello-dji/applications/flycontroll/tellopy/helloworld.md).

# HelloWorld

This application will help us to understand how to connect to Tello and also to start to interact with this drone.

```
// Import the libraries 
from time import sleep
import tellopy

// Define the handler of de drone, to detect when we have a flight event.
def handler(event, sender, data, **args):
   drone = sender
   if event is drone.EVENT_FLIGHT_DATA:
      print(data)

// Define our function that would help us to create our rutine, 
// First we subscribe to the handler, and then we connect to the drone.
// We need to wait for a connection and if not this would fail.
// We give the insturction of takeoff and land. 
def test():
   drone = tellopy.Tello()
   try:
      drone.subscribe(drone.EVENT_FLIGHT_DATA, handler)

      drone.connect()
      drone.wait_for_connection(60.0)
      drone.takeoff()
      sleep(5)
      drone.land()
      sleep(5)
   except Exception as ex:
      print(ex)
   finally:
      drone.quit()

if __name__ == '__main__':
   test()
```