import pytg
import pytg.utils
import pytg.receiver

messages_received = []

@pytg.utils.coroutine
def receiver_function(tg_receiver):
    while True:
        message = (yield)
        messages_received.append(message)
        print("message received and added to list of messages received")

tg_receiver = pytg.receiver.Receiver()
tg_receiver.start()
tg_receiver.message(receiver_function(tg_receiver))
receiver.stop()