prompt-toolkit / prompt-toolkit/python-prompt-toolkit

AssertionError from full screen tutorial code

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Description

I'm trying to follow the full screen application tutorial on http://python-prompt-toolkit.readthedocs.io/en/stable/pages/full_screen_apps.html, but get the following error on just the first code example:

Traceback (most recent call last):
  File "mco.py", line 13, in <module>
    cli = CommandLineInterface(application=application)
  File "/home/tsvenson/.virtualenvs/orson/lib/python3.4/site-packages/prompt_toolkit/interface.py", line 69, in __init__
    assert isinstance(eventloop, EventLoop)
AssertionError

List of venv-modules:

mysql-connector-python (2.1.3)
pip (7.1.2)
prompt-toolkit (1.0.3)
setuptools (18.2)
six (1.10.0)
wcwidth (0.1.7)
wheel (0.24.0)

This is on Ubuntu 14.04 LTS

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First steps

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  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start with the first code example in the full-screen application tutorial and compare it with prompt_toolkit/interface.py line 69 in the installed prompt-toolkit 1.0.3 environment. Reproduce the AssertionError on Ubuntu or an equivalent virtual environment, then verify that the tutorial example runs without the event-loop assertion.

Written by the indexing model from the issue text.

Assessment

Tech stack
python
Domain
cli
Issue type
Bug
Difficulty
2/5
Estimated time
1-3 hours
Activity status
Stale
Clarity
Needs clarification
Newbie friendliness
35/100

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