Django迁移数据库报错：django.core.exceptions.ImproperlyConfigured: mysqlclient 1.3.13 or newer is required; you have 0.9.3.解决方案

在/Users/xxx/PYTHONWORKSPACE/ProjectManage/PM/lib/python3.7/site-packages/django/db/backends/mysql/base.py

中注释掉如下内容：