Mac修改默认python版本

修改 ~/.bash_profile 文件

查看python3安装路径

which python3

/Library/Frameworks/Python.framework/Versions/3.7/bin/python3.7

编辑~/.bash_profile

vi ~/.bash_profile
按i进入编辑模式

添加PATH，alias

#add PATH
export PATH=${PATH}:/Library/Frameworks/Python.framework/Versions/3.7/bin

#alias python
alias python2='/Library/Frameworks/Python.framework/Versions/2.7/bin/python2.7'
alias python3='/Library/Frameworks/Python.framework/Versions/3.7/bin/python3.7'
alias python=python3

#alias pip
alias pip='/Library/Frameworks/Python.framework/Versions/3.7/bin/pip3'

保存~/.bash_profile

esc退出编辑模式

：wq保存

生效~/.bash_profile

source ~/.bash_profile