My database link information was as follows before, and an error was reported when the python file was executed, mysql.connector.errors.ProgrammingError: 1115 (42000): Unknown character set: ‘utf8mb4’
db_config ={‘host’: ‘xxxx’,
‘port’: ‘3306’,
‘username’: ‘xxxx’,
‘password’: ‘xxxx’,
‘database’: ‘future’}
So I searched and searched on the Internet and saw many solutions, but they all told you how to change the sql file to utf8 or something, but no one said how to modify the python file or Code or pycharm. Later, I suddenly wanted to add a'charset':'utf8' to the above configuration file, because the current database uses the old version of utf8. If you don't tell the database, he will use utf8mb4 by default, so change it to utf8 is fine, here is my code to link to the database
db_config ={‘host’: ‘xxxx’,
‘port’: ‘3306’,
‘username’: ‘xxxx’,
‘password’: ‘xxxx’,
‘database’: ‘future’,
’charset’:‘utf8’}

from mysql import connector
from xxxx.common.read_config import ReadConfig
from xxxx.common import project_path

class DoMysql:
    def do_mysql(self,query,flag=1):
        '''query: sql query statement
                       flag: 1 means there are one query result, 2 means there are multiple query results'''
                 db_config =ReadConfig(project_path.config_path).get_other('DB','db_config')#Get the ip of the database link from the configuration file, etc.
        cnn = connector.connect(**db_config)
        cursor = cnn.cursor()
                 cursor.execute(query) # query does not require commit

        if flag==1:
                         res = cursor.fetchone() # returned tuple
                         #print('The result of querying the database is: {}'.format(res))
        else:
                         res = cursor.fetchall() # returned list of nested tuples
                         #print('The result of querying the database is: {}'.format(res))
        return res
                 # #Add, delete and modify the database, update
        # update="update member set RegName='ww' where id='1139812'"
        # cursor.execute(update)
                 # cursor.execute('commit')#Submit

if __name__=='__main__':
    query="select id from loan where MemberID='293366'; "    #"select min(id) from member where id>'1139813'# "
    sq=DoMysql().do_mysql(query,2)
         #print('The result of querying the database is: {}'.format(sq))