步骤
1 修改可执行文件路径
打开配置文件，指定 python 命令对应的可执行文件路径：
$ open ~/.bash_profile
增加以下：
export PATH=/usr/local/Cellar/python/3.7.4_1/bin:${PATH}
注意，如果是使用 oh-my-zsh，则需要修改添加以上内容到 ~/.zshrc中。
2 配置文件生效
$ source ~/.bash_profile
3 验证
使用python命令查看：
$ python
Python 2.7.15 (default, Aug 22 2018, 16:36:18)
[GCC 4.2.1 Compatible Apple LLVM 9.1.0 (clang-902.0.39.2)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>>
Reference
- What is the difference between .bash_profile and .bashrc? - https://medium.com/@kingnand.90/what-is-the-difference-between-bash-profile-and-bashrc-d4c902ac7308
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