help, search in python mysql

[tarata]

hi i have a raspberry pi3.

I install php mysql et...

Now i want search if value is present in table.

helpppp!

my code is

import time
import MySQLdb

val = 'BBBBB'

db = MySQLdb.connect(host="localhost", user="", passwd="", db="")
        #create a cursor for the select
cursor = db.cursor()


# if val exist in tabella1 then insert in tabella2

if 
sql = "select * from tabella1 where valore = 'BBBBB' "

.....
....

anyone help me please