[置顶] Python mysqldb: Library not loaded: libmysqlclient.18.dylib

Python mysqldb: Library not loaded: libmysqlclient.18.dylib

安装python mysql db

pip install MySQL-python –upgrade

运行

这个时候就会弹出这样的错误如下
Python mysqldb: Library not loaded: libmysqlclient.18.dylib
很显然，是说找不到mysql的library,

我们知道mysql的lib应该在/usr/local/mysql/lib下面，但是为何找不到

Lib加载路径

mac上lib的加载路径靠环境变量DYLD_LIBRARY_PATH
如下添加环境变量即可。
export DYLD_LIBRARY_PATH=/usr/local/mysql/lib/:$DYLD_LIBRARY_PATH

更好的解决方案

% otool -L /Library/Python/2.7/site-packages/_mysql.so
/Library/Python/2.7/site-packages/_mysql.so:
    libmysqlclient.18.dylib (compatibility version 18.0.0, current version 18.0.0)
    /usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current version 169.3.0)

发现_mysql.so依赖libmysqlclient.18.dylib没有路径信息, 使用如下命令添加路径信息

% sudo install_name_tool -change libmysqlclient.18.dylib /usr/local/mysql/lib/libmysqlclient.18.dylib /Library/Python/2.7/site-packages/_mysql.so

然后再次查看依赖, 发现此时已经有了lib的路径信息，直接运行，即可成功

% otool -L /Library/Python/2.7/site-packages/_mysql.so                                                                                           
/Library/Python/2.7/site-packages/_mysql.so:
    /usr/local/mysql/lib/libmysqlclient.18.dylib (compatibility version 18.0.0, current version 18.0.0)
    /usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current version 169.3.0)

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