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首先 which python 找到 连接目录
/usr/bin/python
备份链接
mv python /Users/xiaoyu/python
生成链接 其实就是win的mklink /d /s
sudo ln -s /usr/local/Cellar/python3/3.4.3/bin/python3.4 /usr/bin/python
ok
mac 默认python2.7 修改成3.4
原文地址:http://www.cnblogs.com/daxuejia/p/4595325.html