install ipython

pip install ipython

报错：Requirement already satisfied: pathlib2; python_version == "2.7" or python_version == "3.3" in ./Library/Python/2.7/lib/python/site-packages (from ipython)

解决：

pip3 install ipython

25791513144634_.pic_hd.jpg

错误原因：

安装的时候，必须要指定是安装在python3 还是python2.7目录下。