jupyter笔记本无法识别任何内核，尤其是为其虚拟环境选择的内核[复制]

Question

我花了几天时间来解决conda的python虚拟环境无法识别它们周围构建的内核的问题。这个问题表现为Spyder和Jupyter笔记本都无法从有效的内核开始。下面是一个为内核3.8.10构建的conda环境的例子，该环境专门运行pymc3（每个pymc3环境要求），以及它是如何在jupyter-笔记本中失败的，jupyter-笔记本也专门选择并安装在该环境中。

我唯一确定的是：错误信息完全是误导。win3api dll似乎与实际问题无关

有人认识这个吗？有什么调整能让我走吗？或者这是另一个撕裂并重新安装Anaconda3的案例？这是一个熟悉的副歌。

##########################

Failed to start the kernel
Unhandled error

Traceback (most recent call last):
  File "C:\Users\Peter\AppData\Roaming\Python\Python38\site-packages\tornado\web.py", line 1704, in _execute
    result = await result
  File "C:\Users\Peter\AppData\Roaming\Python\Python38\site-packages\tornado\gen.py", line 769, in run
    yielded = self.gen.throw(*exc_info)  # type: ignore
  File "C:\Users\Peter\anaconda3\lib\site-packages\notebook\services\sessions\handlers.py", line 69, in post
    model = yield maybe_future(
  File "C:\Users\Peter\AppData\Roaming\Python\Python38\site-packages\tornado\gen.py", line 762, in run
    value = future.result()
  File "C:\Users\Peter\AppData\Roaming\Python\Python38\site-packages\tornado\gen.py", line 769, in run
    yielded = self.gen.throw(*exc_info)  # type: ignore
  File "C:\Users\Peter\anaconda3\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:\Users\Peter\AppData\Roaming\Python\Python38\site-packages\tornado\gen.py", line 762, in run
    value = future.result()
  File "C:\Users\Peter\AppData\Roaming\Python\Python38\site-packages\tornado\gen.py", line 769, in run
    yielded = self.gen.throw(*exc_info)  # type: ignore
  File "C:\Users\Peter\anaconda3\lib\site-packages\notebook\services\sessions\sessionmanager.py", line 100, in start_kernel_for_session
    kernel_id = yield maybe_future(
  File "C:\Users\Peter\AppData\Roaming\Python\Python38\site-packages\tornado\gen.py", line 762, in run
    value = future.result()
  File "C:\Users\Peter\anaconda3\lib\site-packages\notebook\services\kernels\kernelmanager.py", line 176, in start_kernel
    kernel_id = await maybe_future(self.pinned_superclass.start_kernel(self, **kwargs))
  File "C:\Users\Peter\AppData\Roaming\Python\Python38\site-packages\jupyter_client\multikernelmanager.py", line 186, in start_kernel
    km.start_kernel(**kwargs)
  File "C:\Users\Peter\AppData\Roaming\Python\Python38\site-packages\jupyter_client\manager.py", line 337, in start_kernel
    kernel_cmd, kw = self.pre_start_kernel(**kw)
  File "C:\Users\Peter\AppData\Roaming\Python\Python38\site-packages\jupyter_client\manager.py", line 286, in pre_start_kernel
    self.write_connection_file()
  File "C:\Users\Peter\AppData\Roaming\Python\Python38\site-packages\jupyter_client\connect.py", line 466, in write_connection_file
    self.connection_file, cfg = write_connection_file(self.connection_file,
  File "C:\Users\Peter\AppData\Roaming\Python\Python38\site-packages\jupyter_client\connect.py", line 136, in write_connection_file
    with secure_write(fname) as f:
  File "C:\Users\Peter\anaconda3\lib\contextlib.py", line 113, in __enter__
    return next(self.gen)
  File "C:\Users\Peter\AppData\Roaming\Python\Python38\site-packages\jupyter_core\paths.py", line 461, in secure_write
    win32_restrict_file_to_user(fname)
  File "C:\Users\Peter\AppData\Roaming\Python\Python38\site-packages\jupyter_core\paths.py", line 387, in win32_restrict_file_to_user
    import win32api
ImportError: DLL load failed while importing win32api: The specified procedure could not be found.
​```

Answer 1

首先，确保使用conda activate myenv

接下来，安装为Jupyter提供IPython内核的ipykernel：

pip install --user ipykernel

接下来，您可以通过键入以下内容将虚拟环境添加到Jupyter：

python -m ipykernel install --user --name=myenv

应打印以下内容：

Installed kernelspec myenv in /home/user/.local/share/jupyter/kernels/myenv

在这个文件夹中，您将找到一个kernel.json文件，如果您正确地完成了所有操作，该文件应如下所示：

{
"argv": [
     "/home/user/anaconda3/envs/myenv/bin/python",
     "-m",
     "ipykernel_launcher",
     "-f",
     "{connection_file}"
    ],
"display_name": "myenv",
"language": "python"
}

就这样！