数据迁移报错：query = query.decode(errors=‘replace’) AttributeError: ‘str’ object has no attribute ‘decode

在 django 框架执行数据迁移的时候，常会遇到报错：
query = query.decode(errors=‘replace’) AttributeError: ‘str’ object has no attribute ‘decode’
常见低版本的Django 比如 ：Django2.2.5

python3.8 + Django2.2.5

query = query.decode(errors='replace')
AttributeError: 'str' object has no attribute 'decode'

File "/home/python/.virtualenvs/luffyapi/lib/python3.8/site-packages/django/db/backends/mysql/operations.py", line 146, in last_executed_query
query = query.decode(errors='replace')
AttributeError: 'str' object has no attribute 'decode'

按照报错提示的地方点进去修改：
修改前 ：query = query.decode(errors=‘replace’)
修改后： query = query.encode(errors=‘replace’)
再重新执行 ：

python manage.py makemigrations
python manage.py migrate

def last_executed_query(self, cursor, sql, params):
        # With MySQLdb, cursor objects have an (undocumented) "_executed"
        # attribute where the exact query sent to the database is saved.
        # See MySQLdb/cursors.py in the source distribution.
        query = getattr(cursor, '_executed', None)
        if query is not None:
            query = query.encode(errors='replace')
        return query