crash error

In [3]: nn.relu
Traceback (most recent call last):
  File "/home/hcl/miniconda3/envs/pytorch/lib/python3.7/site-packages/IPython/terminal/ptutils.py", line 113, in get_completions
    yield from self._get_completions(body, offset, cursor_position, self.ipy_completer)
  File "/home/hcl/miniconda3/envs/pytorch/lib/python3.7/site-packages/IPython/terminal/ptutils.py", line 129, in _get_completions
    for c in completions:
  File "/home/hcl/miniconda3/envs/pytorch/lib/python3.7/site-packages/IPython/core/completer.py", line 438, in _deduplicate_completions
    completions = list(completions)
  File "/home/hcl/miniconda3/envs/pytorch/lib/python3.7/site-packages/IPython/core/completer.py", line 1818, in completions
    for c in self._completions(text, offset, _timeout=self.jedi_compute_type_timeout/1000):
  File "/home/hcl/miniconda3/envs/pytorch/lib/python3.7/site-packages/IPython/core/completer.py", line 1862, in _completions
    full_text=full_text, cursor_line=cursor_line, cursor_pos=cursor_column)
  File "/home/hcl/miniconda3/envs/pytorch/lib/python3.7/site-packages/IPython/core/completer.py", line 2030, in _complete
    cursor_pos, cursor_line, full_text)
  File "/home/hcl/miniconda3/envs/pytorch/lib/python3.7/site-packages/IPython/core/completer.py", line 1374, in _jedi_matches
    text[:offset], namespaces, column=cursor_column, line=cursor_line + 1)
  File "/home/hcl/miniconda3/envs/pytorch/lib/python3.7/site-packages/jedi/api/__init__.py", line 726, in __init__
    project=Project(Path.cwd()), **kwds)
TypeError: __init__() got an unexpected keyword argument 'column'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/hcl/miniconda3/envs/pytorch/bin/ipython", line 8, in <module>
    sys.exit(start_ipython())
  File "/home/hcl/miniconda3/envs/pytorch/lib/python3.7/site-packages/IPython/__init__.py", line 126, in start_ipython
    return launch_new_instance(argv=argv, **kwargs)
  File "/home/hcl/miniconda3/envs/pytorch/lib/python3.7/site-packages/traitlets/config/application.py", line 845, in launch_instance
    app.start()
  File "/home/hcl/miniconda3/envs/pytorch/lib/python3.7/site-packages/IPython/terminal/ipapp.py", line 356, in start
    self.shell.mainloop()
  File "/home/hcl/miniconda3/envs/pytorch/lib/python3.7/site-packages/IPython/terminal/interactiveshell.py", line 564, in mainloop
    self.interact()
  File "/home/hcl/miniconda3/envs/pytorch/lib/python3.7/site-packages/IPython/terminal/interactiveshell.py", line 547, in interact
    code = self.prompt_for_code()
  File "/home/hcl/miniconda3/envs/pytorch/lib/python3.7/site-packages/IPython/terminal/interactiveshell.py", line 475, in prompt_for_code
    **self._extra_prompt_options())
  File "/home/hcl/miniconda3/envs/pytorch/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 "/home/hcl/miniconda3/envs/pytorch/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 "/home/hcl/miniconda3/envs/pytorch/lib/python3.7/asyncio/base_events.py", line 584, in run_until_complete
    return future.result()
  File "/home/hcl/miniconda3/envs/pytorch/lib/python3.7/site-packages/prompt_toolkit/application/application.py", line 783, in run_async
    return await _run_async2()
  File "/home/hcl/miniconda3/envs/pytorch/lib/python3.7/site-packages/prompt_toolkit/application/application.py", line 771, in _run_async2
    await self.cancel_and_wait_for_background_tasks()
  File "/home/hcl/miniconda3/envs/pytorch/lib/python3.7/site-packages/prompt_toolkit/application/application.py", line 872, in cancel_and_wait_for_background_tasks
    await task
  File "/home/hcl/miniconda3/envs/pytorch/lib/python3.7/site-packages/prompt_toolkit/buffer.py", line 1854, in new_coroutine
    await coroutine(*a, **kw)
  File "/home/hcl/miniconda3/envs/pytorch/lib/python3.7/site-packages/prompt_toolkit/buffer.py", line 1684, in async_completer
    document, complete_event
  File "/home/hcl/miniconda3/envs/pytorch/lib/python3.7/site-packages/prompt_toolkit/completion/base.py", line 270, in get_completions_async
    document, complete_event
  File "/home/hcl/miniconda3/envs/pytorch/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 "/home/hcl/miniconda3/envs/pytorch/lib/python3.7/site-packages/IPython/terminal/ptutils.py", line 116, in get_completions
    exc_type, exc_value, exc_tb = sys.exc_info()
NameError: name 'sys' is not defined

If you suspect this is an IPython 7.19.0 bug, please report it at:
    https://github.com/ipython/ipython/issues
or send an email to the mailing list at [e-mail]

You can print a more detailed traceback right now with "%tb", or use "%debug"
to interactively debug it.

Extra-detailed tracebacks for bug-reporting purposes can be enabled via:
    %config Application.verbose_crash=True

[mmesiti]

Reading the traceback:

1. The sys and traceback imports are missing in IPython/terminal/ptutils.py, and this is the problem that causes the Ipython crash;
2. In jedi/api/__init__.py, it complains that the “column” argument is passed to Script.__init__, which does not accept such argument;
3. This error comes from IPython/core/completer.py, where at line 1373 a new jedi.Interpreter is created, passing a “column” argument to it, which chokes it.

The way to create a Script object has changed between jedi 0.17 and jedi 0.18: In 0.17:

     def __init__(self, code=None, line=None, column=None, path=None,                                    
                 encoding=None, sys_path=None, environment=None,                                               
                 project=None, source=None):

in 0.18:

    def __init__(self, code=None, *, path=None, environment=None, project=None):

If you install jedi 0.17 instead of jedi 0.18 the current version of ipython should work. This worked for me:

pip uninstall jedi
pip install jedi==0.17.2

[Carreau]

#12793 fixes it. IPython master already had the changes. No, pinning jedi does not work because pip uses a resolver (conda as well), so if I release a new version of IPython that say “jedi < 0.18”, the resolver if free to say. “Cool, cool, cool, I’ll install jedi=0.18 and don’t upgrade IPython”.