IPYTHONDIR was usable for old versions of ipython, but since project was renamed to Jupyter the environment variable is JUPYTER_CONFIG_DIR.
Ref: http://jupyter.readthedocs.io/en/latest/projects/jupyter-directories.html#envvar-JUPYTER_CONFIG_DIR
IPYTHONDIR was usable for old versions of ipython, but since project was renamed to Jupyter the environment variable is JUPYTER_CONFIG_DIR.
Ref: http://jupyter.readthedocs.io/en/latest/projects/jupyter-directories.html#envvar-JUPYTER_CONFIG_DIR