remove unclosed parentheses

main.py

import re
import sys

# 'up' is unclosed-parentheses

def cut_up_regexp(text):
    pattern = re.compile(r'\([^\)]+$')
    return pattern.sub('', text)

def cut_up(text):
    i = 0
    pos = -1
    for c in list(text):
        if c is '(':
            pos = i
        elif c is ')':
            pos = -1

        i += 1

    res = text[0:(pos if pos is not -1 else len(text))]
    return res

def main():
    text = sys.argv[1]
    print cut_up_regexp(text)
    print cut_up(text)

if __name__ == '__main__':
    main()

test.py

import unittest
import os

from main import cut_up_regexp, cut_up

class Test(unittest.TestCase):

    def setUp(self):
        self.textIn = 'esdfd((esdf)(esdf'
        self.textOut = 'esdfd((esdf)'

    def test_cut_up_regexp(self):
        res = cut_up_regexp(self.textIn)
        self.assertEqual(res, self.textOut)
        
    def test_cut_up(self):
        res = cut_up(self.textIn)
        self.assertEqual(res, self.textOut)

if __name__ == "__main__":
    unittest.main()