1.状况：删除了几个C盘文件，燃后jupyter一直连接不上内核；卸载anaconda，python重装之后还是连接错误；
显示为
Traceback (most recent call last):
File "C:\ProgramData\Anaconda3\lib\site-packages\tornado\web.py", line 1704, in _execute
result = await result
File "C:\ProgramData\Anaconda3\lib\site-packages\tornado\gen.py", line 769, in run
yielded = self.gen.throw(*exc_info) # type: ignore
File "C:\ProgramData\Anaconda3\lib\site-packages\notebook\services\sessions\handlers.py", line 69, in post
model = yield maybe_future(
File "C:\ProgramData\Anaconda3\lib\site-packages\tornado\gen.py", line 762, in run
value = future.result()
File "C:\ProgramData\Anaconda3\lib\site-packages\tornado\gen.py", line 769, in run
yielded = self.gen.throw(*exc_info) # type: ignore
File "C:\ProgramData\Anaconda3\lib\site-packages\notebook\services\sessions\sessionmanager.py", line 98, in create_session
kernel_id = yield self.start_kernel_for_session(session_id, path, name, type, kernel_name)
File "C:\ProgramData\Anaconda3\lib\site-packages\tornado\gen.py", line 762, in run
value = future.result()
File "C:\ProgramData\Anaconda3\lib\site-packages\tornado\gen.py", line 769, in run
yielded = self.gen.throw(*exc_info) # type: ignore
File "C:\ProgramData\Anaconda3\lib\site-packages\notebook\services\sessions\sessionmanager.py", line 110, in start_kernel_for_session
kernel_id = yield maybe_future(
File "C:\ProgramData\Anaconda3\lib\site-packages\tornado\gen.py", line 762, in run
value = future.result()
File "C:\ProgramData\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:\ProgramData\Anaconda3\lib\site-packages\jupyter_client\multikernelmanager.py", line 186, in start_kernel
km.start_kernel(**kwargs)
File "C:\ProgramData\Anaconda3\lib\site-packages\jupyter_client\manager.py", line 337, in start_kernel
kernel_cmd, kw = self.pre_start_kernel(**kw)
File "C:\ProgramData\Anaconda3\lib\site-packages\jupyter_client\manager.py", line 292, in pre_start_kernel
kernel_cmd = self.format_kernel_cmd(extra_arguments=extra_arguments)
File "C:\ProgramData\Anaconda3\lib\site-packages\jupyter_client\manager.py", line 210, in format_kernel_cmd
cmd = self.kernel_spec.argv + extra_arguments
File "C:\ProgramData\Anaconda3\lib\site-packages\jupyter_client\manager.py", line 114, in kernel_spec
self._kernel_spec = self.kernel_spec_manager.get_kernel_spec(self.kernel_name)
File "C:\ProgramData\Anaconda3\lib\site-packages\jupyter_client\kernelspec.py", line 232, in get_kernel_spec
return self._get_kernel_spec_by_name(kernel_name, resource_dir)
File "C:\ProgramData\Anaconda3\lib\site-packages\jupyter_client\kernelspec.py", line 200, in _get_kernel_spec_by_name
return self.kernel_spec_class.from_resource_dir(resource_dir)
File "C:\ProgramData\Anaconda3\lib\site-packages\jupyter_client\kernelspec.py", line 46, in from_resource_dir
kernel_dict = json.load(f)
File "C:\ProgramData\Anaconda3\lib\json\__init__.py", line 293, in load
return loads(fp.read(),
File "C:\ProgramData\Anaconda3\lib\json\__init__.py", line 357, in loads
return _default_decoder.decode(s)
File "C:\ProgramData\Anaconda3\lib\json\decoder.py", line 337, in decode
obj, end = self.raw_decode(s, idx=_w(s, 0).end())
File "C:\ProgramData\Anaconda3\lib\json\decoder.py", line 353, in raw_decode
obj, end = self.scan_once(s, idx)
json.decoder.JSONDecodeError: Invalid \escape: line 3 column 6 (char 18)
2.尝试：
改变kernel.json文件斜杠；(重启也没用）
tornado降级，jupyter notebook降级，python降级到3.8.5
暴力重装；（安装过程无法下载entrypoint，因为distutils安装的...）
pip3 install --upgrade --force-reinstall --no-cache-dir jupyter
ERROR: Cannot uninstall 'entrypoints'. It is a distutils installed project and thus we cannot accurately determine which files belong to it which would lead to only a partial uninstall.
pip3 install --upgrade --force-reinstall --no-cache-dir jupyter --ignore-installed
ERROR: Could not install packages due to an OSError: [WinError 5] 拒绝访问。: 'C:\\ProgramData\\Anaconda3\\Lib\\site-packages\\_cffi_backend.cp38-win_amd64.pyd'
Consider using the `--user` option or check the permissions.
凉凉，只能把启动jupyter的界面给各位大哥看看了：
[W 16:34:33.003 NotebookApp] Error loading server extension jupyter_nbextensions_configurator
Traceback (most recent call last):
File "C:\ProgramData\Anaconda3\lib\site-packages\notebook\notebookapp.py", line 2033, in init_server_extensions
mod = importlib.import_module(modulename)
File "C:\ProgramData\Anaconda3\lib\importlib\__init__.py", line 127, in import_module
return _bootstrap._gcd_import(name[level:], package, level)
File "<frozen importlib._bootstrap>", line 1014, in _gcd_import
File "<frozen importlib._bootstrap>", line 991, in _find_and_load
File "<frozen importlib._bootstrap>", line 973, in _find_and_load_unlocked
ModuleNotFoundError: No module named 'jupyter_nbextensions_configurator'
[W 2021-06-10 16:34:34.526 LabApp] 'notebook_dir' has moved from NotebookApp to ServerApp. This config will be passed to ServerApp. Be sure to update your config before our next release.
[W 2021-06-10 16:34:34.526 LabApp] 'notebook_dir' has moved from NotebookApp to ServerApp. This config will be passed to ServerApp. Be sure to update your config before our next release.
[I 2021-06-10 16:34:34.537 LabApp] JupyterLab extension loaded from C:\ProgramData\Anaconda3\lib\site-packages\jupyterlab
[I 2021-06-10 16:34:34.538 LabApp] JupyterLab application directory is C:\ProgramData\Anaconda3\share\jupyter\lab
[I 16:34:34.543 NotebookApp] Serving notebooks from local directory: C:\Users\HASEE
[I 16:34:34.543 NotebookApp] Jupyter Notebook 6.3.0 is running at:
[I 16:34:34.543 NotebookApp] http://localhost:8888/?token=33b8f8491ce3287f2656579d418fd5a06a1ea2a7353c1673
[I 16:34:34.544 NotebookApp] or http://127.0.0.1:8888/?token=33b8f8491ce3287f2656579d418fd5a06a1ea2a7353c1673
[I 16:34:34.544 NotebookApp] Use Control-C to stop this server and shut down all kernels (twice to skip confirmation).
[C 16:34:34.809 NotebookApp]
To access the notebook, open this file in a browser:
file:///C:/Users/HASEE/AppData/Roaming/jupyter/runtime/nbserver-5068-open.html
Or copy and paste one of these URLs:
http://localhost:8888/?token=33b8f8491ce3287f2656579d418fd5a06a1ea2a7353c1673
or http://127.0.0.1:8888/?token=33b8f8491ce3287f2656579d418fd5a06a1ea2a7353c1673
[W 16:34:37.424 NotebookApp] 404 GET /nbextensions/nbextensions_configurator/tree_tab/main.js?v=20210610163432 (::1) 9.970000ms referer=http://localhost:8888/tree
软件版本：
python3.8.8，
pip 21.1.2,
jupyter core : 4.7.1
jupyter-notebook : 6.3.0
qtconsole : 5.0.3
ipython : 7.24.1
ipykernel : 5.3.4
jupyter client : 6.1.12
jupyter lab : 3.0.14
nbconvert : 6.0.7
ipywidgets : 7.6.3
nbformat : 5.1.3
traitlets : 5.0.5
