Referenced from: /Library/Python/2.7/site-packages/_mysql.so
Reason: image not found

這個原本發生在我移掉舊版的 mariadb v10.1 改安裝 mariadb v10.2 或切換 mariadb 為 mysql 時會發生。

網路上解法：

I solved the problem by creating a symbolic link to the library. I.e.

The actual library resides in

/usr/local/mysql/lib

And then I created a symbolic link in

/usr/lib

Using the command:

sudo ln -s /usr/local/mysql/lib/libmysqlclient.18.dylib /usr/lib/libmysqlclient.18.dylib

so that I have the following mapping:

ls -l libmysqlclient.18.dylib 
lrwxr-xr-x  1 root  wheel  44 16 Jul 14:01 libmysqlclient.18.dylib -> /usr/local/mysql/lib/libmysqlclient.18.dylib

That was it. After that everything worked fine.

EDIT:

Notice, that since MacOS El Capitan the System Integrity Protection (SIP, also known as “rootless”) will prevent you from creating links in /usr/lib/. You could disable SIP by following these instructions, but you can create a link in /usr/local/lib/ instead:

sudo ln -s /usr/local/mysql/lib/libmysqlclient
 
.18.dylib /usr/local/lib/libmysqlclient.18.dylib

我下了上面的指令，還是無效。

使用 brew unlink mysql 再 brewlink mysql 還是無效。

仔細去看上面的 path 發現我電腦裡的實際path 不是那個，所以改成使用：

sudo ln -s /usr/local/Cellar/mysql/5.7.18_1/lib/libmysqlclient.dylib /usr/local/lib/libmysqlclient.18.dylib

然後顯示

ln: /usr/local/lib/libmysqlclient.18.dylib: File exists

所以，把 link 檔案刪掉後，再下一次，結果還是不行。原來是之前 mariadb 的 path 不是在

/usr/local/lib/libmysqlclient.18.dylib

而是在 /usr/local/opt/mariadb/lib/libmysqlclient.18.dylib

所以，先

rm /usr/local/opt/mariadb/lib/libmysqlclient.18.dylib

再

makedir -p /usr/local/opt/mariadb/lib/

sudo ln -s /usr/local/Cellar/mysql/5.7.18_1/lib/libmysqlclient.dylib /usr/local/opt/mariadb/lib/libmysqlclient.18.dylib

大功告成，收工。