为什么 Jupyter Notebook 中出现内核错误？

Question

我是python的新手。打开 jupyter notebook 时，我在内核中收到以下错误。有什么想法可以解决吗？jupyter 的安装是通过 Anaconda3 完成的 - 尝试重新安装和设置环境变量，但到目前为止没有运气。任何帮助将不胜感激。

 Traceback (most recent call last):

      File "C:\Users\drag88\AppData\Roaming\Python\Python37\site-packages\tornado\web.py", line 1699, in _execute

        result = await result

      File "C:\Users\drag88\AppData\Roaming\Python\Python37\site-packages\tornado\gen.py", line 742, in run

        yielded = self.gen.throw(*exc_info)  # type: ignore

      File "C:\Users\drag88\AppData\Roaming\Python\Python37\site-packages\notebook\services\sessions\handlers.py", line 72, in post

        type=mtype))

      File "C:\Users\drag88\AppData\Roaming\Python\Python37\site-packages\tornado\gen.py", line 735, in run

        value = future.result()

      File "C:\Users\drag88\AppData\Roaming\Python\Python37\site-packages\tornado\gen.py", line 742, in run

        yielded = self.gen.throw(*exc_info)  # type: ignore

      File "C:\Users\drag88\AppData\Roaming\Python\Python37\site-packages\notebook\services\sessions\sessionmanager.py", line 88, in create_session

        kernel_id = yield self.start_kernel_for_session(session_id, path, name, type, kernel_name)

      File "C:\Users\drag88\AppData\Roaming\Python\Python37\site-packages\tornado\gen.py", line 735, in run

        value = future.result()

      File "C:\Users\drag88\AppData\Roaming\Python\Python37\site-packages\tornado\gen.py", line 742, in run

        yielded = self.gen.throw(*exc_info)  # type: ignore

      File "C:\Users\drag88\AppData\Roaming\Python\Python37\site-packages\notebook\services\sessions\sessionmanager.py", line 101, in start_kernel_for_session

        self.kernel_manager.start_kernel(path=kernel_path, kernel_name=kernel_name)

      File "C:\Users\drag88\AppData\Roaming\Python\Python37\site-packages\tornado\gen.py", line 735, in run

        value = future.result()

Answer 1

当 jupyter 在 Windows 上的依赖项出现问题时，您似乎已经安装了它。请参阅https://github.com/jupyterlab/jupyterlab/issues/7259。我遇到了同样的错误。它现在应该在 conda 上修复，所以如果你从 conda 卸载并重新安装 jupyterlab，它不应该再抛出那个错误了。

Answer 2

第 2 步命令： conda activate (location of your env folder)第三步命令： python -m ipykernel install --user适用于 Windows。

Answer 3

此错误有时是由于之前创建的已删除环境造成的。对于 Windows 用户，在 cmd 中运行以下代码python -m ipykernel 安装 –user