Reason: image not found
Problem
通过 python manage.py runserver 0.0.0.0:80 启动 Django 时，报错：
django.core.exceptions.ImproperlyConfigured: Error loading MySQLdb module: dlopen(/Working/my_project/venv/lib/python2.7/site-packages/_mysql.so, 2): Library not loaded: /usr/local/opt/mysql@5.7/lib/libmysqlclient.20.dylib
Referenced from: /Working/my_project/venv/lib/python2.7/site-packages/_mysql.so
Reason: image not found
Unhandled exception in thread started by <_pydev_bundle.pydev_monkey._NewThreadStartupWithTrace instance at 0x10acf42d8>
Solution
这其实是因为在启动 Django 时，python interpreter 为了连接 MySQL，需要 libmysqlclient.20.dylib 文件，而去 /usr/local/opt/mysql@5.7/lib/libmysqlclient.20.dylib 路径下找时，未找到该文件。
而事实上，本机中其实有 libmysqlclient.20.dylib 文件的，我的这个文件位于 /usr/local/mysql-5.7.28-macos10.14-x86_64/lib/libmysqlclient.20.dylib 下。
# 直接创建软链接，有可能会出现因不存在特定文件夹，导致创建失败的情况
$ sudo ln -s /usr/local/mysql-5.7.28-macos10.14-x86_64/lib/libmysqlclient.20.dylib /usr/local/opt/mysql@5.7/lib/libmysqlclient.20.dylib
ln: /usr/local/opt/mysql@5.7/lib/libmysqlclient.20.dylib: No such file or directory
$ mkdir /usr/local/opt/mysql@5.7
$ cd /usr/local/opt/mysql@5.7
$ mkdir lib
$ sudo ln -s /usr/local/mysql-5.7.28-macos10.14-x86_64/lib/libmysqlclient.20.dylib /usr/local/opt/mysql@5.7/lib/libmysqlclient.20.dylib
再次启动 Django 时，一切正常。
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