错误

Question

看来我的内核之一被删除了。也许这就是为什么我会收到此错误。我该如何解决？我可以重新安装某些东西吗（也许是基本环境中的内核）？

如果没有更好的选择，我将根据Default kernel in jupyter notebook (Python3) not working尝试完全重新安装anaconda。

我尝试使用以下内容：

当前内核列表

jupyter kernelspec list

输出：

Available kernels:
  python3    C:\Users\raysu\AppData\Roaming\jupyter\kernels\python3
  vpython    C:\ProgramData\jupyter\kernels\vpython

但是我必须有另一个与我的基本环境相关联的内核（我想应该以某种方式删除了它）。

C:\Users\raysu\Documents>conda env list
# conda environments:
#
base                  *  C:\Program Files (x86)\Microsoft Visual Studio\Shared\Anaconda3_64
astra_env                C:\Program Files (x86)\Microsoft Visual Studio\Shared\Anaconda3_64\envs\astra_env
bokeh_env                C:\Program Files (x86)\Microsoft Visual Studio\Shared\Anaconda3_64\envs\bokeh_env
sound_env                C:\Program Files (x86)\Microsoft Visual Studio\Shared\Anaconda3_64\envs\sound_env
tf_env                   C:\Program Files (x86)\Microsoft Visual Studio\Shared\Anaconda3_64\envs\tf_env
                         C:\Users\raysu\Anaconda3
                         C:\Users\raysu\Anaconda3\envs\pyforge
opencv_env               C:\Users\raysu\AppData\Local\conda\conda\envs\opencv_env
test_env                 C:\Users\raysu\AppData\Local\conda\conda\envs\test_env

错误

Traceback (most recent call last):
  File "C:\Program Files (x86)\Microsoft Visual Studio\Shared\Anaconda3_64\lib\site-packages\tornado\web.py", line 1699, in _execute
    result = await result
  File "C:\Program Files (x86)\Microsoft Visual Studio\Shared\Anaconda3_64\lib\site-packages\tornado\gen.py", line 742, in run
    yielded = self.gen.throw(*exc_info)  # type: ignore
  File "C:\Program Files (x86)\Microsoft Visual Studio\Shared\Anaconda3_64\lib\site-packages\notebook\services\sessions\handlers.py", line 72, in post
    type=mtype))
  File "C:\Program Files (x86)\Microsoft Visual Studio\Shared\Anaconda3_64\lib\site-packages\tornado\gen.py", line 735, in run
    value = future.result()
  File "C:\Program Files (x86)\Microsoft Visual Studio\Shared\Anaconda3_64\lib\site-packages\tornado\gen.py", line 742, in run
    yielded = self.gen.throw(*exc_info)  # type: ignore
  File "C:\Program Files (x86)\Microsoft Visual Studio\Shared\Anaconda3_64\lib\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:\Program Files (x86)\Microsoft Visual Studio\Shared\Anaconda3_64\lib\site-packages\tornado\gen.py", line 735, in run
    value = future.result()
  File "C:\Program Files (x86)\Microsoft Visual Studio\Shared\Anaconda3_64\lib\site-packages\tornado\gen.py", line 742, in run
    yielded = self.gen.throw(*exc_info)  # type: ignore
  File "C:\Program Files (x86)\Microsoft Visual Studio\Shared\Anaconda3_64\lib\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:\Program Files (x86)\Microsoft Visual Studio\Shared\Anaconda3_64\lib\site-packages\tornado\gen.py", line 735, in run
    value = future.result()
  File "C:\Program Files (x86)\Microsoft Visual Studio\Shared\Anaconda3_64\lib\site-packages\tornado\gen.py", line 209, in wrapper
    yielded = next(result)
  File "C:\Program Files (x86)\Microsoft Visual Studio\Shared\Anaconda3_64\lib\site-packages\notebook\services\kernels\kernelmanager.py", line 168, in start_kernel
    super(MappingKernelManager, self).start_kernel(**kwargs)
  File "C:\Users\raysu\AppData\Roaming\Python\Python36\site-packages\jupyter_client\multikernelmanager.py", line 110, in start_kernel
    km.start_kernel(**kwargs)
  File "C:\Users\raysu\AppData\Roaming\Python\Python36\site-packages\jupyter_client\manager.py", line 240, in start_kernel
    self.write_connection_file()
  File "C:\Users\raysu\AppData\Roaming\Python\Python36\site-packages\jupyter_client\connect.py", line 476, in write_connection_file
    kernel_name=self.kernel_name
  File "C:\Users\raysu\AppData\Roaming\Python\Python36\site-packages\jupyter_client\connect.py", line 141, in write_connection_file
    with secure_write(fname) as f:
  File "C:\Program Files (x86)\Microsoft Visual Studio\Shared\Anaconda3_64\lib\contextlib.py", line 81, in __enter__
    return next(self.gen)
  File "C:\Users\raysu\AppData\Roaming\Python\Python36\site-packages\jupyter_core\paths.py", line 404, in secure_write
    win32_restrict_file_to_user(fname)
  File "C:\Users\raysu\AppData\Roaming\Python\Python36\site-packages\jupyter_core\paths.py", line 359, in win32_restrict_file_to_user
    import win32api
ImportError: DLL load failed: The specified procedure could not be found.

Answer 1

在全新安装Anaconda之后，通过编辑相关的kernelspec：kernel.json文件来解决此问题。

详细解决方案

如前所述，我发现我有两个 kernelspecs。（命令：jupyter kernelspec list）

python3：C:\Users\raysu\AppData\Roaming\jupyter\kernels\python3
vpython：C:\ProgramData\jupyter\kernels\vpython

kernelspec是一个.json文件，该文件维护jupyter-notebook / lab启动特定内核的内核规范。幸运的是，内核 vpython 运行正常，这帮助我缩小了 kernelpsec: python3 内部问题的根源。我必须更正python可执行文件（python.exe）的路径，从而解决了该问题。

我想提一下，在这种情况下，以下两个资源非常有用。在看到kernelspec文档的典型结构之后，我对问题可能出在哪里有了更清晰的认识。

注意：但是，由于我无法检验该理论，因此我会请遇到类似问题的其他人首先复制旧的kernel.json文件，然后更新路径到python.exe文件。如果这样可以解决 内核错误 ，则可能完全不需要重新安装Anaconda。

长话短说：

如果您的jupyter笔记本/实验室环境显示内核错误，则问题的根源很可能在kernelspec文件中： kernel.json 和路径到 python.exe 不正确。如果即使重新安装anaconda / jupyter-notebook / lab后仍然存在相同的kernel error，这可能是更可能的情况。

例如，在我的情况下，python3-kernelspec位于：

"C:\Users\raysu\AppData\Roaming\jupyter\kernels\python3"

python.exe位于：

"C:\Users\raysu\Anaconda3\python.exe"

但是， python-executable 的路径是错误的：它仍显示旧安装的路径。在安装anaconda之后，此路径已更改。因此，我不得不通过编辑kernel.json文件来更新python3的kernelspec。

# kernel.json file
{
 "argv": [
  "C:\\Users\\raysu\\Anaconda3\\python.exe",
  "-m",
  "ipykernel_launcher",
  "-f",
  "{connection_file}"
 ],
 "display_name": "Python 3",
 "language": "python"
}

如果这不能解决您的问题，请查阅以下两个文档。因此，我浪费了4天。希望这个答案将来能对某人有所帮助。

什么有用吗？

Answer 2

我能够解决问题 here

我使用此命令安装了jupyter_client 5.3.4和jupyter_core 4.6.0

pip install jupyter_client --upgrade

Jupyter实验室和笔记本问题：内核错误

当前内核列表

错误

2 个答案:

详细解决方案

长话短说：

什么有用吗？