New submission from nartes <serega.bela...@gmail.com>:

Python 3.7.0a2+ (heads/master:bc8ac6b00e, Nov 30 2017, 22:14:00)
Type 'copyright', 'credits' or 'license' for more information
IPython 6.2.1 -- An enhanced Interactive Python. Type '?' for help.

In [1]: import multiException in thread Thread-38:
Traceback (most recent call last):
  File 
"/home/nartes/Documents/current/cpython/tmp/install/lib/python3.7/site-packages/parso/grammar.py",
 line 265, in load_grammar
    return _loaded_grammars[path]
KeyError: 
'/home/nartes/Documents/current/cpython/tmp/install/lib/python3.7/site-packages/parso/python/grammar37.txt'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File 
"/home/nartes/Documents/current/cpython/tmp/install/lib/python3.7/site-packages/parso/grammar.py",
 line 268, in load_grammar
    with open(path) as f:
FileNotFoundError: [Errno 2] No such file or directory: 
'/home/nartes/Documents/current/cpython/tmp/install/lib/python3.7/site-packages/parso/python/grammar37.txt'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File 
"/home/nartes/Documents/current/cpython/tmp/install/lib/python3.7/threading.py",
 line 917, in _bootstrap_inner
    self.run()
  File 
"/home/nartes/Documents/current/cpython/tmp/install/lib/python3.7/threading.py",
 line 865, in run
    self._target(*self._args, **self._kwargs)
  File 
"/home/nartes/Documents/current/cpython/tmp/install/lib/python3.7/site-packages/prompt_toolkit/interface.py",
 line 865, in run
    completions = list(buffer.completer.get_completions(document, 
complete_event))
  File 
"/home/nartes/Documents/current/cpython/tmp/install/lib/python3.7/site-packages/IPython/terminal/ptutils.py",
 line 84, in get_completions
    yield from self._get_completions(body, offset, cursor_position, 
self.ipy_completer)
  File 
"/home/nartes/Documents/current/cpython/tmp/install/lib/python3.7/site-packages/IPython/terminal/ptutils.py",
 line 94, in _get_completions
    for c in completions:
  File 
"/home/nartes/Documents/current/cpython/tmp/install/lib/python3.7/site-packages/IPython/core/completer.py",
 line 438, in _deduplicate_completions
    completions = list(completions)
  File 
"/home/nartes/Documents/current/cpython/tmp/install/lib/python3.7/site-packages/IPython/core/completer.py",
 line 1791, in completions
    for c in self._completions(text, offset, 
_timeout=self.jedi_compute_type_timeout/1000):
  File 
"/home/nartes/Documents/current/cpython/tmp/install/lib/python3.7/site-packages/IPython/core/completer.py",
 line 1831, in _completions
    full_text=full_text, cursor_line=cursor_line, cursor_pos=cursor_column)
  File 
"/home/nartes/Documents/current/cpython/tmp/install/lib/python3.7/site-packages/IPython/core/completer.py",
 line 1998, in _complete
    cursor_pos, cursor_line, full_text)
  File 
"/home/nartes/Documents/current/cpython/tmp/install/lib/python3.7/site-packages/IPython/core/completer.py",
 line 1348, in _jedi_matches
    text, namespaces, column=cursor_column, line=cursor_line + 1)
  File 
"/home/nartes/Documents/current/cpython/tmp/install/lib/python3.7/site-packages/jedi/api/__init__.py",
 line 386, in __init__
    super(Interpreter, self).__init__(source, **kwds)
  File 
"/home/nartes/Documents/current/cpython/tmp/install/lib/python3.7/site-packages/jedi/api/__init__.py",
 line 110, in __init__
    self._grammar = parso.load_grammar()
  File 
"/home/nartes/Documents/current/cpython/tmp/install/lib/python3.7/site-packages/parso/grammar.py",
 line 283, in load_grammar
    return load_grammar(**kwargs)
  File 
"/home/nartes/Documents/current/cpython/tmp/install/lib/python3.7/site-packages/parso/grammar.py",
 line 275, in load_grammar
    raise NotImplementedError(message)
NotImplementedError: Python version None is currently not supported.

----------
files: Screenshot from 2017-11-30 23-04-28.png
messages: 307339
nosy: nartes
priority: normal
severity: normal
status: open
title: tab completion fails in pdb/ipdb/ipython for python3.8
type: crash
versions: Python 3.7
Added file: https://bugs.python.org/file47310/Screenshot from 2017-11-30 
23-04-28.png

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue32187>
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