situation   follow the instructions in the flash Sqlalchemy document to configure the  
SQLALCHEMY_ DATABASE_ URI = ‘ mysql://username:password@server/db ‘  
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after operation, MySQL reports an error importerror: no module named ‘MySQL db’.  
why  
since there is no MySQL DB module, follow the normal idea  
pip install MySQLdb  
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it should be able to solve this problem, but no corresponding module can be found. After checking, this is because mysql-3.23 through 5.5 and python-2.4 through 2.7 are currently supported.  
solutions  
looking for alternatives  
in Python 3, we generally use pymysql.  
implementation  
pip install PyMySQL
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change the database connection to  
mysql+ pymysql://username:password@server/db
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the next operation is normal original link: https://blog.csdn.net/zzq900503/article/details/89096311