问题：
I use IPython notebooks and would like to be able to select to create a 2.x or 3.x python notebook in IPython.我使用 IPython 笔记本，并希望能够选择在 IPython 中创建 2.x 或 3.x python 笔记本。
I initially had Anaconda.我最初有 Anaconda。 With Anaconda a global environment variable had to be changed to select what version of python you want and then IPython could be started.使用 Anaconda 时，必须更改全局环境变量以选择所需的 Python 版本，然后才能启动 IPython。 This is not what I was looking for so I uninstalled Anaconda and now have set up my own installation using MacPorts and PiP.这不是我想要的，所以我卸载了 Anaconda，现在使用 MacPorts 和 PiP 设置了我自己的安装。 It seems that I still have to use看来还是得用
port select --set python <python version>
to toggle between python 2.x and 3.x.在 python 2.x 和 3.x 之间切换。 which is no better than the anaconda solution.这并不比 anaconda 解决方案好。
Is there a way to select what version of python you want to use after you start an IPython notebook, preferably with my current MacPorts build?有没有办法在启动 IPython 笔记本后选择要使用的 Python 版本，最好使用我当前的 MacPorts 版本？
解决方案：
参考一： https://en.stackoom.com/question/23wWV参考二： https://stackoom.com/question/23wWV