main.py

main.py

chunks = [
    'He',
    'llo ',
    ', W',
    'orl',
    'd!\nA',
    'nd h',
    'ap',
    'py ',
    'Pyth',
    'oning\n',
]


# class that pretends to be your libssh channel
class Channel:
    def __init__(self):
        self.data = iter(chunks)

    def read(self):
        try:
            return self.data.__next__()
        except StopIteration:
            return ''


buffer = ''
channel = Channel()


while True:
    data = channel.read()

    if not data:
        # Do you want to process final message if it doesn't have '\n'?
        # If so, do it here, before the break.
        break

    buffer += data

    if '\n' not in buffer:
        continue

    message, _, buffer = buffer.partition('\n')

    print(message)