无法在 jupyter notebook 上启动内核

Question

我最近卸载了 Anaconda3 并在 Python 2 上重新安装了 Anaconda。在此之后，当我使用 jupyter 笔记本时，似乎无法运行内核。我在尝试打开的任何笔记本上都收到此内核错误：

启动内核失败

Traceback (most recent call last):
  File "C:\Users\Ejer\Anaconda2\lib\site-packages\notebook\base\handlers.py", line 516, in wrapper
    result = yield gen.maybe_future(method(self, *args, **kwargs))
  File "C:\Users\Ejer\Anaconda2\lib\site-packages\tornado\gen.py", line 1055, in run
    value = future.result()
  File "C:\Users\Ejer\Anaconda2\lib\site-packages\tornado\concurrent.py", line 238, in result
    raise_exc_info(self._exc_info)
  File "C:\Users\Ejer\Anaconda2\lib\site-packages\tornado\gen.py", line 1063, in run
    yielded = self.gen.throw(*exc_info)
  File "C:\Users\Ejer\Anaconda2\lib\site-packages\notebook\services\sessions\handlers.py", line 75, in post
    type=mtype))
  File "C:\Users\Ejer\Anaconda2\lib\site-packages\tornado\gen.py", line 1055, in run
    value = future.result()
  File "C:\Users\Ejer\Anaconda2\lib\site-packages\tornado\concurrent.py", line 238, in result
    raise_exc_info(self._exc_info)
  File "C:\Users\Ejer\Anaconda2\lib\site-packages\tornado\gen.py", line 1063, in run
    yielded = self.gen.throw(*exc_info)
  File "C:\Users\Ejer\Anaconda2\lib\site-packages\notebook\services\sessions\sessionmanager.py", line 79, in create_session
    kernel_id = yield self.start_kernel_for_session(session_id, path, name, type, kernel_name)
  File "C:\Users\Ejer\Anaconda2\lib\site-packages\tornado\gen.py", line 1055, in run
    value = future.result()
  File "C:\Users\Ejer\Anaconda2\lib\site-packages\tornado\concurrent.py", line 238, in result
    raise_exc_info(self._exc_info)
  File "C:\Users\Ejer\Anaconda2\lib\site-packages\tornado\gen.py", line 1063, in run
    yielded = self.gen.throw(*exc_info)
  File "C:\Users\Ejer\Anaconda2\lib\site-packages\notebook\services\sessions\sessionmanager.py", line 92, in start_kernel_for_session
    self.kernel_manager.start_kernel(path=kernel_path, kernel_name=kernel_name)
  File "C:\Users\Ejer\Anaconda2\lib\site-packages\tornado\gen.py", line 1055, in run
    value = future.result()
  File "C:\Users\Ejer\Anaconda2\lib\site-packages\tornado\concurrent.py", line 238, in result
    raise_exc_info(self._exc_info)
  File "C:\Users\Ejer\Anaconda2\lib\site-packages\tornado\gen.py", line 307, in wrapper
    yielded = next(result)
  File "C:\Users\Ejer\Anaconda2\lib\site-packages\notebook\services\kernels\kernelmanager.py", line 94, in start_kernel
    super(MappingKernelManager, self).start_kernel(**kwargs)
  File "C:\Users\Ejer\Anaconda2\lib\site-packages\jupyter_client\multikernelmanager.py", line 110, in start_kernel
    km.start_kernel(**kwargs)
  File "C:\Users\Ejer\Anaconda2\lib\site-packages\jupyter_client\manager.py", line 257, in start_kernel
    **kw)
  File "C:\Users\Ejer\Anaconda2\lib\site-packages\jupyter_client\manager.py", line 203, in _launch_kernel
    return launch_kernel(kernel_cmd, **kw)
  File "C:\Users\Ejer\Anaconda2\lib\site-packages\jupyter_client\launcher.py", line 128, in launch_kernel
    proc = Popen(cmd, **kwargs)
  File "C:\Users\Ejer\Anaconda2\lib\subprocess.py", line 390, in __init__
    errread, errwrite)
  File "C:\Users\Ejer\Anaconda2\lib\subprocess.py", line 640, in _execute_child
    startupinfo)
WindowsError: [Error 2] The system cannot find the file specified

Answer 1

你的意思是你卸载了python 3并安装了python2？假设这是您所做的，右键单击 anacona 提示符并以管理员身份运行尝试在管理员模式下运行命令提示符后运行它

python2 -m pip install ipykernel

或

python2 -m ipykernel install --user

Answer 2

这可能是因为 juypter 无法找到 python。

尝试在您的 anaconda 安装中查看 share/jupyter/kernels//kernel.json，您会看到类似这样的内容。

{
 "argv": [
  "C:\\Anaconda3\\python.exe",
  "-m",
  "ipykernel_launcher",
  "-f",
  "{connection_file}"
 ],
 "display_name": "Python 3",
 "language": "python"
}

确保argv下的python路径正确。