0.18.0 causes ipython to not be able to show command completion.

[kyin98]

When using jedi 0.18.0, my ipython session will crash when trying to use the 'tab' to command complete:

Traceback (most recent call last):
File "/lab2300-home/kyin/ssim3/.venv/lib/python3.7/site-packages/prompt_toolkit/application/application.py", line 765, in _run_async2
result = await _run_async()
File "/lab2300-home/kyin/ssim3/.venv/lib/python3.7/site-packages/prompt_toolkit/application/application.py", line 706, in _run_async
result = await f
EOFError

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "/lab2300-home/kyin/ssim3/.venv/bin/ipython", line 8, in
sys.exit(start_ipython())
File "/lab2300-home/kyin/ssim3/.venv/lib/python3.7/site-packages/IPython/init.py", line 126, in start_ipython
return launch_new_instance(argv=argv, **kwargs)
File "/lab2300-home/kyin/ssim3/.venv/lib/python3.7/site-packages/traitlets/config/application.py", line 845, in launch_instance
app.start()
File "/lab2300-home/kyin/ssim3/.venv/lib/python3.7/site-packages/IPython/terminal/ipapp.py", line 356, in start
self.shell.mainloop()
File "/lab2300-home/kyin/ssim3/.venv/lib/python3.7/site-packages/IPython/terminal/interactiveshell.py", line 564, in mainloop
self.interact()
File "/lab2300-home/kyin/ssim3/.venv/lib/python3.7/site-packages/IPython/terminal/interactiveshell.py", line 547, in interact
code = self.prompt_for_code()
File "/lab2300-home/kyin/ssim3/.venv/lib/python3.7/site-packages/IPython/terminal/interactiveshell.py", line 475, in prompt_for_code
**self._extra_prompt_options())
File "/lab2300-home/kyin/ssim3/.venv/lib/python3.7/site-packages/prompt_toolkit/shortcuts/prompt.py", line 1013, in prompt
return self.app.run(set_exception_handler=set_exception_handler)
File "/lab2300-home/kyin/ssim3/.venv/lib/python3.7/site-packages/prompt_toolkit/application/application.py", line 817, in run
self.run_async(pre_run=pre_run, set_exception_handler=set_exception_handler)
File "/usr/lib/python3.7/asyncio/base_events.py", line 584, in run_until_complete
return future.result()
File "/lab2300-home/kyin/ssim3/.venv/lib/python3.7/site-packages/prompt_toolkit/application/application.py", line 783, in run_async
return await _run_async2()
File "/lab2300-home/kyin/ssim3/.venv/lib/python3.7/site-packages/prompt_toolkit/application/application.py", line 771, in _run_async2
await self.cancel_and_wait_for_background_tasks()
File "/lab2300-home/kyin/ssim3/.venv/lib/python3.7/site-packages/prompt_toolkit/application/application.py", line 872, in cancel_and_wait_for_background_tasks
await task
File "/lab2300-home/kyin/ssim3/.venv/lib/python3.7/site-packages/prompt_toolkit/buffer.py", line 1854, in new_coroutine
await coroutine(*a, **kw)
File "/lab2300-home/kyin/ssim3/.venv/lib/python3.7/site-packages/prompt_toolkit/buffer.py", line 1684, in async_completer
document, complete_event
File "/lab2300-home/kyin/ssim3/.venv/lib/python3.7/site-packages/prompt_toolkit/completion/base.py", line 270, in get_completions_async
document, complete_event
File "/lab2300-home/kyin/ssim3/.venv/lib/python3.7/site-packages/prompt_toolkit/completion/base.py", line 196, in get_completions_async
for item in self.get_completions(document, complete_event):
File "/lab2300-home/kyin/ssim3/.venv/lib/python3.7/site-packages/IPython/terminal/ptutils.py", line 116, in get_completions
print_tb(e)
File "/usr/lib/python3.7/traceback.py", line 53, in print_tb
print_list(extract_tb(tb, limit=limit), file=file)
File "/usr/lib/python3.7/traceback.py", line 72, in extract_tb
return StackSummary.extract(walk_tb(tb), limit=limit)
File "/usr/lib/python3.7/traceback.py", line 344, in extract
for f, lineno in frame_gen:
File "/usr/lib/python3.7/traceback.py", line 309, in walk_tb
yield tb.tb_frame, tb.tb_lineno
AttributeError: 'TypeError' object has no attribute 'tb_frame'

When I change the version back to 0.17.2, the command completion works again. Here are the steps that I used:

1. virtualenv -p python3 --system-site-packages .venv
2. create a file requirements.txt with the line "ipython==7.17.0"
3. activate the virtual environment
4. run 'pip3 install -r requirements.txt'
5. run 'ipython'
6. type 'from sub' and the command completion remain blank
7. use 'ctrl-d' to exit ipython and the traceback should appear

Work around for me was to add 'jedi==0.17.2' in the requirements file.

[PeterJCLaw]

Thanks, however this is an issue with IPython (ipython/ipython#12740) and a duplicate of #1714.