2003 - Can't connect to MySQL server on 'localhost (10061 "Unknown error")

# 通过命令行尝试连接MySQL服务器
mysql -h localhost -u username -p

# 使用Python的MySQL连接库尝试连接MySQL服务器
import mysql.connector

try:
    cnx = mysql.connector.connect(user='username', password='password', host='localhost', database='dbname')
    print("Connected to MySQL server")
    cnx.close()
except mysql.connector.Error as err:
    print(f"Failed to connect to MySQL server: {err}")