在MacOs上，这对我来说很管用:

/Users/`userName`/opt/anaconda3/bin/jupyter_mac.command

如果你使用'pip'而不是'pip3'为Python 2安装Jupyter notebook，它可能会运行:

ipython notebook

用conda重新安装jupyter:

conda install jupyter

在MacOs上，这对我来说很管用:

/Users/`userName`/opt/anaconda3/bin/jupyter_mac.command

安装 jupyterlab。

如果你得到这个错误:

ERROR: After October 2020 you may experience errors when installing or updating packages. This is because pip will change the way that it resolves dependency conflicts.

We recommend you use --use-feature=2020-resolver to test your packages with the new resolver before it becomes the default.

requests 2.25.1 requires idna<3,>=2.5, but you'll have idna 3.1 which is incompatible.

用这个:

pip3 install jupyterlab --use-feature=2020-resolver

更新的Jupyter版本默认不附带笔记本组件。

根据你的包管理器，你可以通过以下方式安装笔记本组件:

pip install notebook

or

poetry add notebook