无法让 Jupyter Notebook 运行 - “无法导入名称 AsyncGenerator”

Question

有人对如何解决此问题有任何建议吗？我没有使用 Anaconda。我的 Jupyter 版本是 1.0.0。

Traceback (most recent call last):
  File "c:\python36\lib\runpy.py", line 193, in _run_module_as_main
    "__main__", mod_spec)
  File "c:\python36\lib\runpy.py", line 85, in _run_code
    exec(code, run_globals)
  File "c:\python36\lib\site-packages\ipykernel_launcher.py", line 15, in <module>
    from ipykernel import kernelapp as app
  File "c:\python36\lib\site-packages\ipykernel\__init__.py", line 2, in <module>
    from .connect import *
  File "c:\python36\lib\site-packages\ipykernel\connect.py", line 13, in <module>
    from IPython.core.profiledir import ProfileDir
  File "c:\python36\lib\site-packages\IPython\__init__.py", line 56, in <module>
    from .terminal.embed import embed
  File "c:\python36\lib\site-packages\IPython\terminal\embed.py", line 16, in <module>
    from IPython.terminal.interactiveshell import TerminalInteractiveShell
  File "c:\python36\lib\site-packages\IPython\terminal\interactiveshell.py", line 19, in <module>
    from prompt_toolkit.enums import DEFAULT_BUFFER, EditingMode
  File "c:\python36\lib\site-packages\prompt_toolkit\__init__.py", line 16, in <module>
    from .application import Application
  File "c:\python36\lib\site-packages\prompt_toolkit\application\__init__.py", line 1, in <module>
    from .application import Application
  File "c:\python36\lib\site-packages\prompt_toolkit\application\application.py", line 38, in <module>
    from prompt_toolkit.buffer import Buffer
  File "c:\python36\lib\site-packages\prompt_toolkit\buffer.py", line 28, in <module>
    from .application.current import get_app
  File "c:\python36\lib\site-packages\prompt_toolkit\application\current.py", line 8, in <module>
    from prompt_toolkit.eventloop.dummy_contextvars import ContextVar  # type: ignore
  File "c:\python36\lib\site-packages\prompt_toolkit\eventloop\__init__.py", line 1, in <module>
    from .async_generator import generator_to_async_generator
  File "c:\python36\lib\site-packages\prompt_toolkit\eventloop\async_generator.py", line 5, in <module>
    from typing import AsyncGenerator, Callable, Iterable, TypeVar, Union
ImportError: cannot import name 'AsyncGenerator'

非常感谢。

Answer 1

原因是prompt_toolkit的版本与Python 3.6不匹配

解决办法是降低版本

pip install --upgrade prompt-toolkit==2.0.1

Answer 2

根据与相同错误文本相关的 Github 问题：https : //github.com/python/typing/issues/530，这是 Python 3.6.1 中修复的错误。

由于您使用的是 Python 3.6.0，您应该将您的版本升级到 3.6.1 或更高版本以解决该问题。

或者，一种解决方法是设置

if TYPE_CHECKING: from typing import AsyncGenerator