SOLVED:
 
MySQLConnection = mysql.builder()
connection = connectionForURI("mysql://prestashop:prestashop@127.0.0.1:3306/prestashop")
=============================================================================

Finally: 
connection = connectionForURI('mysql://prestashop:prestashop@127.0.0.1:3306/prestashop?use_unicode=1&charset=utf8')

Did the trick.

Regards Petr