最短最好的解决方案

conda create --name py3-ml python=3.6
conda install ipykernel

source activate py3-ml # or conda activate py3-ml
python -m ipykernel install --user --name py3-ml

以下命令适用于macOS Sierra(10.12.3)

python3 -m pip install ipykernel
python3 -m ipykernel install --user

用 Jupyter内核规格列表 可用内核: python3 /用户/ admin /图书馆/ Jupyter /内核/ python3 python2 / anaconda2 /分享/ jupyter /内核/ python2

我有Python 2.7，并希望能够在Jupyter内部切换到Python 3。

这些步骤在Windows Anaconda命令提示符上为我工作:

conda update conda
conda create -n py33 python=3.3 anaconda
activate py33
ipython kernelspec install-self
deactivate

现在，在使用Python2.7的常用命令打开ipython notebook之后，在创建新notebook时也可以使用Python3.3。

我很确定你要做的就是逃跑

Pip3安装jupyter

如果你使用的是anaconda发行版，这对我来说是有效的(在macintosh上):

$ conda create -n py3k python=3 anaconda

$ source activate py3k

$ ipython kernelspec install-self

最后一个命令需要注意:

(py3k)Monas-MacBook-Pro:cs799 mona$ ipython kernelspec install-self
[TerminalIPythonApp] WARNING | Subcommand `ipython kernelspec` is deprecated and will be removed in future versions.
[TerminalIPythonApp] WARNING | You likely want to use `jupyter kernelspec` in the future
[InstallNativeKernelSpec] WARNING | `jupyter kernelspec install-self` is DEPRECATED as of 4.0. You probably want `ipython kernel install` to install the IPython kernelspec.
[InstallNativeKernelSpec] Installed kernelspec python3 in /usr/local/share/jupyter/kernels/python3
(py3k)Monas-MacBook-Pro:cs799 mona$ ipython kernel install 
Installed kernelspec python3 in /usr/local/share/jupyter/kernels/python3

按照上述步骤在OSX Yosemite中进行测试，并输入jupter notebook并在浏览器中创建一个新的notebook，您将看到以下截图:

这对我在Ubuntu 16.04上是有效的:

python2 -m pip install ipykernel
python2 -m ipykernel install --user

python3 -m pip install ipykernel
python3 -m ipykernel install --user

参考文档: Python 2和3的内核。安装IPython内核- IPython Docs。