打開terminal報錯
Could not find platform independent libraries <prefix>
Could not find platform dependent libraries <exec_prefix>
Consider setting $PYTHONHOME to <prefix>[:<exec_prefix>]
Fatal Python error: Py_Initialize: unable to load the file system codec
ModuleNotFoundError: No module named 'encodings'

分析原因：
想清理python的安裝版本，刪掉一些文件后就出現如此了，手賤……

解決：

1. sudo vim /etc/profile/
2. export PYTHONHOME=/Library/Frameworks/Python.framework/Versions/3.7
export PYTHONPATH=.:$PYTHONHOME/bin:$PYTHONHOME/site-packages
export PATH=$PATH:$PYTHONHOME:$PYTHONP

運行之后報錯

Fatal Python error: Py_Initialize: unable to load the file system codec
ModuleNotFoundError: No module named 'encodings'

繼續修改
刪掉關于anaconda有關的環境變量

perfect！