class Update_bd_three_hundred:
    connection = pymysql.connect(host="localhost",
                                 user="root",
                                 password="Pr0st1_Mn6Pred6t'cia",
                                 db="users_db")

    def verification_id_three_hundred(self):
        with self.connection:
            cursor = self.connection.cursor()
            cursor.execute("SELECT user_id FROM three_hundred")
            return [x[0] for x in cursor.fetchall()]

    def update_bd_for_user_id_three_hundred(self, user_id):
        with self.connection:
            cursor = self.connection.cursor()
            if user_id not in self.verification_id_three_hundred():
                cursor.execute("INSERT INTO three_hundred VALUES(%s,%s,%s)", (user_id, 'Нет', 'нет'))