Spyder fails to link to IPython console on startup due to tornado upgrade to 5.0

Problem Description

spyder failed linking to ipython console on startup, after tornado upgraded to 5.0

What steps will reproduce the problem?

1. conda update --all (upgrade tornado to 5.0)
2. run spyder
3. an error windows appears when spyder UI is shown. ipython console connection cannot be established (with a circle rotating in the console, which means it’s connecting, but it never ends)

What is the expected output? What do you see instead?

Paste Traceback/Error Below (if applicable)

  File "/home/lee1984/anaconda3/lib/python3.6/site-packages/spyder/plugins/__init__.py", line 514, in <lambda>
    toggled=lambda checked: self.toggle_view(checked),
  File "/home/lee1984/anaconda3/lib/python3.6/site-packages/spyder/plugins/ipythonconsole.py", line 725, in toggle_view
    self.create_new_client(give_focus=False)
  File "/home/lee1984/anaconda3/lib/python3.6/site-packages/spyder/plugins/ipythonconsole.py", line 1038, in create_new_client
    self.connect_client_to_kernel(client)
  File "/home/lee1984/anaconda3/lib/python3.6/site-packages/spyder/plugins/ipythonconsole.py", line 1073, in connect_client_to_kernel
    kc.start_channels(shell=True, iopub=True)
  File "/home/lee1984/anaconda3/lib/python3.6/site-packages/qtconsole/kernel_mixins.py", line 43, in start_channels
    super(QtKernelClientMixin, self).start_channels(*args, **kw)
  File "/home/lee1984/anaconda3/lib/python3.6/site-packages/jupyter_client/threaded.py", line 212, in start_channels
    self.shell_channel._inspect = self._check_kernel_info_reply
  File "/home/lee1984/anaconda3/lib/python3.6/site-packages/jupyter_client/client.py", line 143, in shell_channel
    socket, self.session, self.ioloop
  File "/home/lee1984/anaconda3/lib/python3.6/site-packages/jupyter_client/threaded.py", line 205, in ioloop
    self._ioloop = ioloop.IOLoop()
  File "/home/lee1984/anaconda3/lib/python3.6/site-packages/tornado/util.py", line 312, in __new__
    instance.initialize(*args, **init_kwargs)
  File "/home/lee1984/anaconda3/lib/python3.6/site-packages/zmq/eventloop/ioloop.py", line 139, in initialize
    super(ZMQIOLoop, self).initialize(impl=impl, **kwargs)
  File "/home/lee1984/anaconda3/lib/python3.6/site-packages/tornado/ioloop.py", line 845, in initialize
    super(PollIOLoop, self).initialize(**kwargs)
  File "/home/lee1984/anaconda3/lib/python3.6/site-packages/tornado/ioloop.py", line 357, in initialize
    self.make_current()
  File "/home/lee1984/anaconda3/lib/python3.6/site-packages/tornado/ioloop.py", line 315, in make_current
    assert asyncio is None
AssertionError

Package Versions

• Spyder: 3.2.7
• Python: 3.6.4
• Qt: 5.6.2
• PyQt: 5.5.6
• Operating System: Lubuntu 1604

Problem solution: Downgrade tornado to 4.5.3 by running command: conda install tornado=4.5.3

[lee19840806]

A good news. Today I tried “conda update --all” again, and it has added “pyzmq 17” in the update list. After installed pyzmq 17 and tornado 5.0 now everything works fine.

[epicblack]

Thank you so much! it is working now!