import mysql.connector

​

mydb = mysql.connector.connect(

  host="localhost",

  user="yourusername",

  passwd="yourpassword",

  database="mydatabase"

)

​

mycursor = mydb.cursor()

​

mycursor.execute("ALTER TABLE customers ADD COLUMN id INT AUTO_INCREMENT PRIMARY KEY")

​

#If this page is executed with no error, the table "customers" now has a primary key

​