Voila for Jupyter raises error: raise NotImplementedError

Question

我正在使用 Python 3.8，这是 jupyter --version:

的打印输出

jupyter core     : 4.6.3
jupyter-notebook : 6.0.3
qtconsole        : not installed
ipython          : 7.13.0
ipykernel        : 5.1.4
jupyter client   : 6.0.0
jupyter lab      : 2.0.0
nbconvert        : 5.6.1
ipywidgets       : 7.5.1
nbformat         : 5.0.4
traitlets        : 4.3.3

除了以下内容（直接来自文档），我几乎什么都没做：

pip install voila
git clone https://github.com/QuantStack/voila
cd voila
voila notebooks/bqplot.ipynb

打印如下：

Traceback (most recent call last):
  File "c:\program files\python38\lib\runpy.py", line 192, in _run_module_as_main
    return _run_code(code, main_globals, None,
  File "c:\program files\python38\lib\runpy.py", line 85, in _run_code
    exec(code, run_globals)
  File "C:\Program Files\Python38\Scripts\voila.exe\__main__.py", line 7, in <module>
  File "c:\program files\python38\lib\site-packages\traitlets\config\application.py", line 664, in launch_instance
    app.start()
  File "c:\program files\python38\lib\site-packages\voila\app.py", line 509, in start
    self.listen()
  File "c:\program files\python38\lib\site-packages\voila\app.py", line 529, in listen
    self.app.listen(port)
  File "c:\program files\python38\lib\site-packages\tornado\web.py", line 2116, in listen
    server.listen(port, address)
  File "c:\program files\python38\lib\site-packages\tornado\tcpserver.py", line 152, in listen
    self.add_sockets(sockets)
  File "c:\program files\python38\lib\site-packages\tornado\tcpserver.py", line 165, in add_sockets
    self._handlers[sock.fileno()] = add_accept_handler(
  File "c:\program files\python38\lib\site-packages\tornado\netutil.py", line 279, in add_accept_handler
    io_loop.add_handler(sock, accept_handler, IOLoop.READ)
  File "c:\program files\python38\lib\site-packages\tornado\platform\asyncio.py", line 100, in add_handler
    self.asyncio_loop.add_reader(fd, self._handle_events, fd, IOLoop.READ)
  File "c:\program files\python38\lib\asyncio\events.py", line 501, in add_reader
    raise NotImplementedError
NotImplementedError

我是 Jupyter 的初学者 Notebooks/Lab。我该如何解决这个问题？

Answer 1

在asyncio.py中import asyncio后添加这一行：

asyncio.set_event_loop_policy(asyncio.WindowsSelectorEventLoopPolicy())

https://github.com/mkdocs/mkdocs/commit/2172c9f999b17201102732a53c08e3de0dd48c74

Answer 2

它现在对我有用了 4 次。也许因为我只使用 pip 和一些轮子。在 win10 上，这可能会让你进入 dep。麻烦尤其是地理方面的问题。但我仍然坚持和管理。我认为大多数 windows 用户会遇到此错误，因为 "not implemented"... 而且我认为 win10 系列在这种情况下仍然有点低调。不过结合win10和pip应该没那么难吧。
这就是为什么我给出了这个解决方案。

Answer 3

虽然@PerteTotale 的回答正确地解决了这个问题，但不建议修改库的内部结构。人们可以在设置适当的策略时为 voila 编写一个单独的启动器，例如：

import re
import sys

from voila.app import main

import asyncio


if __name__ == '__main__':
    sys.argv[0] = re.sub(r'(-script\.pyw?|\.exe)?$', '', sys.argv[0])
    if sys.platform == 'win32':
        asyncio.set_event_loop_policy(asyncio.WindowsSelectorEventLoopPolicy()) 
    sys.exit(main())

Voila for Jupyter raises error: raise NotImplementedError

Voila for Jupyter raises error: raise NotImplementedError

jupyter-notebook

ipython

jupyter-lab

voila