原来的：
app.config['SQLALCHEMY_DATABASE_URI'] = 'mysql://username:password@localhost/db_name'
改为：
app.config['SQLALCHEMY_DATABASE_URI'] = 'mysql+pymysql://username:password@localhost/db_name'
原来的：
app.config['SQLALCHEMY_DATABASE_URI'] = 'mysql://username:password@localhost/db_name'
改为：
app.config['SQLALCHEMY_DATABASE_URI'] = 'mysql+pymysql://username:password@localhost/db_name'
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