django2.0+连接mysql数据库迁移时候报错

django.core.exceptions.ImproperlyConfigured: mysqlclient 1.3.13 or newer is required; you have 0.9.3.

# if version < (1, 3, 13):
#     raise ImproperlyConfigured('mysqlclient 1.3.13 or newer is required; you have %s.' % Database.__version__)

AttributeError: 'str' object has no attribute 'decode'

        if query is not None:
            query = query.encode('utf8')
            query = query.decode(errors='replace')
        return query

ValueError: The field admin.LogEntry.user was declared with a lazy reference to 'api.userinfo', but app 'api' isn't installed.

找到自己的python3.x，进入site-packages/django/contrib/admin/migrations文件目录下，除了__init__.py文件，其他的全部删除。（注意，切勿把__init__.py文件删了，也不要把contrib/contenttypes这个文件夹下的migrations删了，不然会导致migrate功能失效，就只能把django卸了重下）。