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

准備將 Django 連接到 MySQL，在命令行輸入命令 python manage.py makemigrations 后報錯： AttributeError: 'str' object has no attribute 'decode'
出現這個錯誤之后可以根據錯誤提示找到文件位置，打開 operations.py 文件，找到以下代碼：

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

根據錯誤信息提示，說明 if 語句執行時出錯， query 是 str 類型，而 decode() 是用來將 bytes 轉換成 string 類型用的，（關於Python編碼點這里），由於 query 不需要解碼，所以直接將 if 語句注釋掉就可以了

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