gistfile1.txt

Write a function that checks an expression has matching brackets and returns true if it does and false otherwise.

 

e.g.

'The is a (full) sentence.' -> True

'(x + y)/ 4' -> True

'(x + y / 4' -> False

'((2 + 3) * (5 + 7))' -> True

'((2 + 3) * (5 + 7)' -> False 

from collections import Counter

from unittest import main
from unittest import TestCase


def validate(sentence):
    counter = Counter(sentence)
    if counter.get('(') == counter.get(')'):
        return True
    return False


class TestValidate(TestCase):
    def test_valid(self):
        self.assertTrue(validate('The is a (full) sentence.'))
        self.assertTrue(validate('(x + y)/ 4'))
        self.assertTrue(validate('((2 + 3) * (5 + 7))'))
        self.assertTrue(validate('no brackets here'))

    def test_invalid(self):
        self.assertFalse(validate('(x + y / 4'))
        self.assertFalse(validate('((2 + 3) * (5 + 7)'))
        self.assertFalse(validate('()(((((('))


if __name__ == '__main__':
    main()