[Bug 252875] devel/ipython: completion still broken after 7.19.0_2

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=252875

            Bug ID: 252875
           Summary: devel/ipython: completion still broken after 7.19.0_2
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: python at FreeBSD.org
          Reporter: rsmith at xs4all.nl
             Flags: maintainer-feedback?(python at FreeBSD.org)
          Assignee: python at FreeBSD.org

Created attachment 221777
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=221777&action=edit
Add missing imports to ptutils.py.

The patch to 7.19.0_2 exposed some other problems:

  File
"/usr/local/lib/python3.9/site-packages/prompt_toolkit/completion/base.py",
line 196, in get_completions_async
    for item in self.get_completions(document, complete_event):
  File "/usr/local/lib/python3.9/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

It turns out that ptutils.py needs two additional imports:

   import sys
   import traceback

(see attached patch)

This however exposes another bug:

Traceback (most recent call last):
  File "/usr/local/lib/python3.9/site-packages/IPython/terminal/ptutils.py",
line 115, in get_completions
    yield from self._get_completions(body, offset, cursor_position,
self.ipy_completer)
  File "/usr/local/lib/python3.9/site-packages/IPython/terminal/ptutils.py",
line 131, in _get_completions
    for c in completions:
  File "/usr/local/lib/python3.9/site-packages/IPython/core/completer.py", line
438, in _deduplicate_completions
    completions = list(completions)
  File "/usr/local/lib/python3.9/site-packages/IPython/core/completer.py", line
1817, in completions
    for c in self._completions(text, offset,
_timeout=self.jedi_compute_type_timeout/1000):
  File "/usr/local/lib/python3.9/site-packages/IPython/core/completer.py", line
1874, in _completions
    signature = _make_signature(jm)
  File "/usr/local/lib/python3.9/site-packages/IPython/core/completer.py", line
991, in _make_signature
    return '(%s)'% ', '.join([f for f in (_formatparamchildren(p) for p in
completion.params) if f])
AttributeError: 'Completion' object has no attribute 'params'

Looking at the differences between completer.py in this version and the one on
github HEAD, they are significant.

It seems to me that until a new version of IPython is released, py-parso and
py-jedi should be rolled back as proposed in #252395.

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