Mac默认自带Python,但版本较低，例如我本机自带的版本为2.7.16
但我想使用Python3，安装了Python3，怎么才能改成默认使用我们想要的版本呢？
此处以切换至Python3为例
获取路径
首先输入python3,会看到Python3.x的版本
输入
import sys输入
print(sys.path)会看到路径
[‘’, ‘/usr/local/Cellar/python/3.7.5/Frameworks/Python.framework/Versions/3.7/lib/python37.zip’, ‘/usr/local/Cellar/python/3.7.5/Frameworks/Python.framework/Versions/3.7/lib/python3.7’, ‘/usr/local/Cellar/python/3.7.5/Frameworks/Python.framework/Versions/3.7/lib/python3.7/lib-dynload’, ‘/Users/hansion/Library/Python/3.7/lib/python/site-packages’, ‘/usr/local/lib/python3.7/site-packages’]
看到版本是3.7
退出 输入 which python3.7
会看到路径/usr/local/bin/python3.7
配置环境变量
open ~/.bash_profile增加 alias python="/usr/local/bin/python3.7" 保存退出
使生效source ~/.bash_profile
验证python --version
