old_contents: from base import *
  DATABASES = {
      'default': {
          'ENGINE': 'django.db.backends.mysql',
          'NAME': 'cloudmusic',
          'USER': 'quxl',
          'PASSWORD': 'quxl',
          'HOST': 'localhost',
          'PORT': '3306',
          'OPTIONS':{
              'init_command':'SET storage_engine=INNODB',
          },
      }
  }
new_contents: from base import *
  DATABASES = {
      'default': {
          'ENGINE': 'django.db.backends.mysql',
          'NAME': 'cloudmusic',
          'USER': 'root',
          'PASSWORD': 'qxlaylj',
          'HOST': 'localhost',
          'PORT': '3306',
          'OPTIONS':{
              'init_command':'SET storage_engine=INNODB',
          },
      }
  }
subject: update production.py ,chage mysql username and pwd