選項卡上的 Jupyter 自動完成/建議不起作用

Question

在使用像 nltk 這樣的庫時，選項卡自動完成就像一種祝福，它可以輕松地列出正在使用的模塊的功能和屬性。 幾個月前它曾經工作得很好，但最近我一直面臨這個自動完成沒有出現的新問題。 它們最初似乎工作正常，但一段時間后，內核活動指示器只是在按下 Tab 鍵時閃爍，而沒有任何反應。 在 jupyter 服務器端，出現以下消息：

[IPKernelApp] ERROR | Exception in message handler:
Traceback (most recent call last):
  File "<the path>\venv\lib\site-packages\ipykernel\kernelbase.py", line 268, in dispatch_shell
    yield gen.maybe_future(handler(stream, idents, msg))
  File "<the path>\venv\lib\site-packages\tornado\gen.py", line 735, in run
    value = future.result()
  File "<the path>\venv\lib\site-packages\tornado\gen.py", line 209, in wrapper
    yielded = next(result)
  File "<the path>\venv\lib\site-packages\ipykernel\kernelbase.py", line 583, in complete_request
    matches = yield gen.maybe_future(self.do_complete(code, cursor_pos))
  File "<the path>\venv\lib\site-packages\ipykernel\ipkernel.py", line 360, in do_complete
    return self._experimental_do_complete(code, cursor_pos)
  File "<the path>\venv\lib\site-packages\ipykernel\ipkernel.py", line 385, in _experimental_do_complete
    completions = list(_rectify_completions(code, raw_completions))
  File "<the path>\venv\lib\site-packages\IPython\core\completer.py", line 484, in rectify_completions
    completions = list(completions)
  File "<the path>\venv\lib\site-packages\IPython\core\completer.py", line 1819, in completions
    if c and (c in seen):
  File "<the path>\venv\lib\site-packages\IPython\core\completer.py", line 1876, in _completions
    else:
  File "<the path>\venv\lib\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])
  File "<the path>\venv\lib\site-packages\IPython\core\completer.py", line 991, in <listcomp>
    return '(%s)'% ', '.join([f for f in (_formatparamchildren(p) for p in completion.params) if f])
  File "<the path>\venv\lib\site-packages\IPython\core\completer.py", line 991, in <genexpr>
    return '(%s)'% ', '.join([f for f in (_formatparamchildren(p) for p in completion.params) if f])
  File "<the path>\venv\lib\site-packages\IPython\core\completer.py", line 968, in _formatparamchildren
    raise ValueError('Jedi function parameter description have change format.'
ValueError: Jedi function parameter description have change format.Expected "param ...", found 'def __subclasshook__'".

雖然這不會嚴重阻礙開發過程，但如果它工作正常，它會非常有幫助。

我目前正在使用 python 3.8.6 64 位（在舊版本上也面臨同樣的問題）並在 Microsoft Edge Chromium 中運行筆記本

Answer 1

絕地是這里的問題。

你可以通過 jupyter 魔法解決這個問題。 只需在筆記本頂部添加以下內容：

%config Completer.use_jedi = False

另一種處理方法是刪除系統上的絕地緩存（ https://github.com/ipython/ipython/issues/12134#issuecomment-590952054 ）：

您需要清除絕地緩存：只需刪除文件夾（linux）

~/.cache/jedi/

你應該沒事的。

對於其他操作系統，請檢查

https://jedi.readthedocs.io/en/latest/docs/settings.html#filesystem-cache