title: Cannot get Jupyter Notebook To Run - "Cannot Import Name AsyncGenerator"
body: <p>Anyone have any suggestions on how to fix this problem?  I am NOT using Anaconda.  The version of Jupyter I have is 1.0.0.</p>
  
  <pre><code>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 &lt;module&gt;
      from ipykernel import kernelapp as app
    File "c:\python36\lib\site-packages\ipykernel\__init__.py", line 2, in &lt;module&gt;
      from .connect import *
    File "c:\python36\lib\site-packages\ipykernel\connect.py", line 13, in &lt;module&gt;
      from IPython.core.profiledir import ProfileDir
    File "c:\python36\lib\site-packages\IPython\__init__.py", line 56, in &lt;module&gt;
      from .terminal.embed import embed
    File "c:\python36\lib\site-packages\IPython\terminal\embed.py", line 16, in &lt;module&gt;
      from IPython.terminal.interactiveshell import TerminalInteractiveShell
    File "c:\python36\lib\site-packages\IPython\terminal\interactiveshell.py", line 19, in &lt;module&gt;
      from prompt_toolkit.enums import DEFAULT_BUFFER, EditingMode
    File "c:\python36\lib\site-packages\prompt_toolkit\__init__.py", line 16, in &lt;module&gt;
      from .application import Application
    File "c:\python36\lib\site-packages\prompt_toolkit\application\__init__.py", line 1, in &lt;module&gt;
      from .application import Application
    File "c:\python36\lib\site-packages\prompt_toolkit\application\application.py", line 38, in &lt;module&gt;
      from prompt_toolkit.buffer import Buffer
    File "c:\python36\lib\site-packages\prompt_toolkit\buffer.py", line 28, in &lt;module&gt;
      from .application.current import get_app
    File "c:\python36\lib\site-packages\prompt_toolkit\application\current.py", line 8, in &lt;module&gt;
      from prompt_toolkit.eventloop.dummy_contextvars import ContextVar  # type: ignore
    File "c:\python36\lib\site-packages\prompt_toolkit\eventloop\__init__.py", line 1, in &lt;module&gt;
      from .async_generator import generator_to_async_generator
    File "c:\python36\lib\site-packages\prompt_toolkit\eventloop\async_generator.py", line 5, in &lt;module&gt;
      from typing import AsyncGenerator, Callable, Iterable, TypeVar, Union
  ImportError: cannot import name 'AsyncGenerator'
  </code></pre>
  
  <p>Much thanks.</p>