question：
tar: Error opening archive: Failed to open '/Users/......
answer:
如图，安装six依赖时报错，那就单独安装six依赖包， brew install six。
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question:
.Logging to '/usr/local/var/mysql/leodeMacBook-Pro.local.err'.
ERROR! The server quit without updating PID file (/usr/local/var/mysql/leodeMacBook-Pro.local.pid).
answer:
https://blog.csdn.net/baodongdong123/article/details/59576532