mac系统软件安装

nodejs安装：

https://www.cnblogs.com/qianmaoliugou/p/14679085.html

brew安装：

https://zhuanlan.zhihu.com/p/90508170

python安装

安装删除单个python

https://zhuanlan.zhihu.com/p/142810523

~/.bash_profile 

文件中配置：

export PATH="/usr/local/opt/python@3.7/bin:$PATH"

alias python="/usr/local/opt/python@3.7/bin/python3"  来自于which python3命令

通过pyenv管理多个python版本

https://www.jianshu.com/p/ab3b3811d32b

pyenv环境变量配置

https://blog.csdn.net/Ghost_chou/article/details/117791352