MacBook：操作系统更新后无法启动 jupyter notebook

Question

安装操作系统更新后，我在 MacBook 上遇到问题，我无法启动 jupyter notebook。

$jupyter notebook
-bash: /usr/local/bin/jupyter: No such file or directory

编辑

pip freeze 的输出：

$ pip freeze
appnope==0.1.0
argon2-cffi==20.1.0
attrs==19.3.0
backcall==0.2.0
bleach==3.1.5
cffi==1.14.2
decorator==4.4.2
defusedxml==0.6.0
entrypoints==0.3
ipykernel==5.3.4
ipyparallel==6.3.0
ipython==7.17.0
ipython-genutils==0.2.0
ipywidgets==7.5.1
jedi==0.17.2
Jinja2==2.11.2
jsonschema==3.2.0
jupyter-client==6.1.6
jupyter-console==6.1.0
jupyter-core==4.6.3
MarkupSafe==1.1.1
mistune==0.8.4
nbconvert==5.6.1
nbformat==5.0.7
notebook==6.1.3
packaging==20.4
pandocfilters==1.4.2
parso==0.7.1
pexpect==4.8.0
pickleshare==0.7.5
prometheus-client==0.8.0
prompt-toolkit==3.0.6
ptyprocess==0.6.0
pycairo==1.19.1
pycparser==2.20
Pygments==2.6.1
PyGObject==3.36.1
pyparsing==2.4.7
pyrsistent==0.16.0
python-dateutil==2.8.1
pyzmq==19.0.2
qtconsole==4.7.5
QtPy==1.9.0
Send2Trash==1.5.0
six==1.15.0
terminado==0.8.3
testpath==0.4.4
tornado==6.0.4
traitlets==4.3.3
wcwidth==0.2.5
webencodings==0.5.1
widgetsnbextension==3.5.1

按照答案中的建议从 Anaconda Navigator 启动 Jupyter notebook。这也不起作用，如下面的屏幕截图所示：

您是否注意到内核按钮显示“内核错误”？点击它会出现以下错误：

Traceback (most recent call last):
  File "/Users/Akil/opt/anaconda3/lib/python3.8/site-packages/tornado/web.py", line 1703, in _execute
    result = await result
  File "/Users/Akil/opt/anaconda3/lib/python3.8/site-packages/tornado/gen.py", line 742, in run
    yielded = self.gen.throw(*exc_info)  # type: ignore
  File "/Users/Akil/opt/anaconda3/lib/python3.8/site-packages/notebook/services/sessions/handlers.py", line 69, in post
    model = yield maybe_future(
  File "/Users/Akil/opt/anaconda3/lib/python3.8/site-packages/tornado/gen.py", line 735, in run
    value = future.result()
  File "/Users/Akil/opt/anaconda3/lib/python3.8/site-packages/tornado/gen.py", line 742, in run
    yielded = self.gen.throw(*exc_info)  # type: ignore
  File "/Users/Akil/opt/anaconda3/lib/python3.8/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 "/Users/Akil/opt/anaconda3/lib/python3.8/site-packages/tornado/gen.py", line 735, in run
    value = future.result()
  File "/Users/Akil/opt/anaconda3/lib/python3.8/site-packages/tornado/gen.py", line 742, in run
    yielded = self.gen.throw(*exc_info)  # type: ignore

Answer 1

对我也不起作用。我建议下载 Anaconda 来启动 Jupyter Notebook，对我有用。

Here 是关于如何安装 Anaconda 的文档。

也可以here下载。

Answer 2

最后，这是对我有用的技巧：

卸载以下软件包：

$python3 -m pip uninstall jupyter_core
$python3 -m pip uninstall jupyter-console

然后重新安装它们：

$python3 -m pip install jupyter-core
$python3 -m pip install jupyter-console

现在启动 jupyter notebook：

$jupyter notebook
[I 20:12:21.500 NotebookApp] Writing notebook server cookie secret to /Users/Akil/Library/Jupyter/runtime/notebook_cookie_secret
[I 20:12:22.354 NotebookApp] Loading IPython parallel extension
[I 20:12:22.356 NotebookApp] Serving notebooks from local directory: /Users/***
[I 20:12:22.356 NotebookApp] Jupyter Notebook 6.1.3 is running at:
[I 20:12:22.356 NotebookApp] http://localhost:8888/?token=1f2de3dddeecfaae8de6b2ab7c5f953109ffb19d390c2e33