Test nbconvert 5.6.1 with jupyter-client 6.2.0

[mriedem]

Related #1549
Related jupyter/jupyter_client/issues/637

[mriedem]

Recreated:

https://travis-ci.org/github/jupyter/nbconvert/jobs/766808690#L1370

self = <nbconvert.preprocessors.execute.ExecutePreprocessor object at 0x7f3e7ca1dd30>

msg_id = '238d6f9e-e6ea4495439b51dfd5175f5b_1'

cell = {'cell_type': 'code', 'metadata': {}, 'outputs': [], 'source': 'from __future__ import print_function\nfrom IPython.display import clear_output'}

timeout = 1

    def _poll_for_reply(self, msg_id, cell=None, timeout=None):

        try:

            # check with timeout if kernel is still alive

            msg = self.kc.shell_channel.get_msg(timeout=timeout)

>           if msg['parent_header'].get('msg_id') == msg_id:

E           TypeError: 'coroutine' object is not subscriptable

[SylvainCorlay]

Hey, thank you for the contribution. I am confused by why we would test against a version of jupyter-client that has been yanked from PyPI.

[mriedem]

Hey, thank you for the contribution. I am confused by why we would test against a version of jupyter-client that has been yanked from PyPI.

This was just showing a recreate of a failure. I'll close it.