'TelnetReaderUnicode' object has no attribute '_wait_for_data'

[Roshan Mehta]

I tried to run simple telnet server:

import asyncio, telnetlib3

@asyncio.coroutine
def shell(reader, writer):
    writer.write('\r\nWould you like to play a game\r\n')
    inp = yield from reader.read(1)
    if inp:
        writer.echo(inp)
        writer.write('\r\nThey say the only way to win '
                     'is to not play at all.\r\n')
        yield from writer.drain()
    writer.close()

loop = asyncio.get_event_loop()
coro = telnetlib3.create_server(port=6023, shell=shell)
server = loop.run_until_complete(coro)
loop.run_until_complete(server.wait_closed())

Now when I connect using default telnet client on ubuntu. I get the error message:
Task exception was never retrieved

future: <Task finished coro=<shell() done, defined at /home/roshanmk/workspace/tall-tsif-testbed/tall/simulators/camera/pickCamera.py:3> exception=AttributeError("'TelnetReaderUnicode' object has no attribute '_wait_for_data'",)>
Traceback (most recent call last):
  File "/usr/lib/python3.4/asyncio/tasks.py", line 237, in _step
    result = next(coro)
  File "/home/roshanmk/workspace/tall-tsif-testbed/tall/simulators/camera/pickCamera.py", line 6, in shell
    inp = yield from reader.read(1)
  File "/usr/local/lib/python3.4/dist-packages/telnetlib3/stream_reader.py", line 183, in read
    yield from self._wait_for_data('read')
AttributeError: 'TelnetReaderUnicode' object has no attribute '_wait_for_data'

I am on Python 3.4.2 and telnetlib3-1.0.1

[Jeff Quast]

This tests OK for me, I can only guess that this method, _wait_for_data was made available in Python 3.4.3, and the version of Python you had at the time of this bug report was 3.4.2 or 3.4.1

python/cpython@c2c12e4#diff-13f9fd3ccf885eae2de41a12562e3449R381