python3. 报“ImportError: No module named ‘MySQLdb'”

须要安装PyMysql

pip install PyMysql

  

而后在程序中引入

import pymysql

pymysql.install_as_MySQLdb()

app.config['SQLALCHEMY_DATABASE_URI'] = 'mysql://root:root@localhost/test'

db = SQLAlchemy(app)这样就不会报错了