Error thrown by call_later()

[ealione]

I am getting the following error thrown when I try to delay the call of a function

Traceback (most recent call last):
  File "/usr/local/lib/python2.7/dist-packages/tornado/ioloop.py", line 1209, in _run
    return self.callback()
  File "/home/pi/test.py", line 123, in _tick
    self._delayed_cb = IOLoop.call_later(self._create_stream, 5000)
TypeError: unbound method call_later() must be called with ZMQIOLoop instance as first argument (got instancemethod instance instead)

The code causing this issue is the following:

self._delayed_cb = IOLoop.call_later(self._create_stream, 5000)
self._delayed_cb.start()

Has something changed in the way call_later works, or is it something I am doing wrong?

[ealione]

Changing to DelayedCallback causes issues too

Traceback (most recent call last):
  File "/usr/local/lib/python2.7/dist-packages/tornado/ioloop.py", line 1209, in _run
    return self.callback()
  File "dedalus/test.py", line 124, in _tick
    self._delayed_cb = DelayedCallback(self._create_stream, 5000)
  File "/usr/local/lib/python2.7/dist-packages/zmq/eventloop/ioloop.py", line 56, in __init__
    super(DelayedCallback, self).__init__(callback, callback_time, io_loop)
TypeError: __init__() takes exactly 3 arguments (4 given)

Could it have something to do with my pyzmq and tornado?

tornado==5.0.1
pyzmq==16.0.2

[minrk]

call_later is an instance method, not a class method. You would use it after getting the current loop, e.g.:

IOLoop.current().call_later(2, func)