balanced bracket list

is_bracket_list_balanced.py

# -*- coding: utf-8 -*-

# Requirements:
# get diff for balanced bracket list
# string as input, you can use only '(' or ')' symbols
# length is 1 to 1000

# Examples:
# str = '((()))';       Answer is : 0
# str = '((()';         Answer is : 2
# str = '())())((';     Answer is : 4


def check(string):
    if 0 < len(string) < 1000:
        lst = list(string)
        balance = 0
        counter = 0

        for x in lst:
            if x == '(':
                balance += 1
            else:
                balance -= 1
            if balance < 0:
                counter += 1
                balance = 0

        return print(balance + counter)
    else:
        return print('The string length should be between 1 and 1000!')


check('((()))')
# 0

check('((()')
# 2

check('())())((')
# 4