python - python : Python 3 and 2 in IPython/Jupyter Notebook

Question

我安装了 Anaconda 的 Python 3，希望能够在 python2 和 3 内核之间快速切换。这是在 OSX 上。

到目前为止我的步骤包括:

conda create -p ~/anaconda/envs/python2 python=2.7
source activate python2
conda install ipython
ipython kernelspec install-self
source deactivate

在此之后，我在 python3 IPython notebook 中有一个 python2 内核可供选择，但是无法启动。

所以我继续修改/usr/local/share/jupyter/kernels/python2/kernel.json

{
 "display_name": "Python 2",
 "language": "python",
 "argv": [
  "/Users/sonium/anaconda/envs/python2/bin/python",
  "-m",
  "IPython.kernel",
  "-f",
  "{connection_file}"
 ],
 "env":{"PYTHONHOME":"~/anaconda/envs/python2/:~/anaconda/envs/python2/lib/"}
}

现在，当我启动 python2 内核时，它失败了:

ImportError: No module named site

Answer 1

显然 IPython 需要明确的路径名，所以没有 '~' 而不是主目录。在将 kernel.json 更改为:

{
 "display_name": "Python 2",
 "language": "python",
 "argv": [
  "/Users/sonium/anaconda/envs/python2/bin/python2.7",
  "-m",
  "IPython.kernel",
  "-f",
  "{connection_file}"
 ],
 "env":{"PYTHONHOME":"/Users/sonium/anaconda/envs/python2"}
}