Python安装：Mac 使用brew 安装Python2 和 Python3
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安装python
## python2 brew install python ## python3 brew install python3 -
出现错误
Error: An unexpected error occurred during the `brew link` step The formula built, but is not symlinked into /usr/local Permission denied @ dir_s_mkdir - /usr/local/Frameworks Error: Permission denied @ dir_s_mkdir - /usr/local/Frameworks -
解决
手动创建目录
$ sudo mkdir /usr/local/Frameworks $ sudo chown $(whoami):admin /usr/local/Frameworks -
查看版本
$ which python /usr/bin/python $ python --version Python 2.7.16 -
设置环境变量
## 打开配置文件，如果没有就在~目录下面创建一个 $ open ~/.bash.profile设置python环境变量路径
# Setting PATH for Python 2.7 系统自带python2 PATH="/System/Library/Frameworks/Python.framework/Versions/2.7/bin:${PATH}" - export PATH # Setting PATH for Python 3.7.5 brew安装的python3 PATH="/usr/local/Cellar/python/3.7.5/bin:${PATH}" ## 设置别名 注意目录看下是否正确 alias python2='/System/Library/Frameworks/Python.framework/Versions/2.7/bin/python2.7' alias python3='/usr/local/Cellar/python/3.7.5/bin/python3' # alias python=python3生效配置文件
source ~/.bash.profile -
验证
## python 和 python2 都指向python2 $ python --version $ python2 --version $ python3 --version
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