Ten minutes cmdb of 2021-01-19 Django2.2 error AttributeError:'str' object has no attribute'decode'

Django2.2报错 AttributeError: 'str' object has no attribute 'decode'

Prepare to connect Django to MySQL and python manage.py makemigrations report AttributeError: 'str' object has no attribute 'decode'
an error after entering the command on the command line:  After  this error occurs, you can find the file location according to the error prompt, open the operations.py file, and find the following code:

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.decode(errors='replace')
    return query

The error message indicates, if an error description statement is executed, a query type str, and  decode() is used to convert the bytes into a string type, (here about Python code points) , since the query does not need to decode, so the if statement directly comment Just drop it

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.decode(errors='replace')
    return query