access denied for user 'root'@'localhost' mysql docker code example

Example 1: access denied for user 'root'@'localhost' mariadb

UPDATE mysql.user SET plugin = 'mysql_native_password' WHERE user = 'root' AND plugin = 'unix_socket';
FLUSH PRIVILEGES;

Example 2: access denied for user 'root'@'localhost' python sql-connect error

SELECT user,authentication_string,plugin,host FROM mysql.user;
ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY 'Current-Root-Password';
FLUSH PRIVILEGES;