class StackTest(unittest.TestCase):
def setUp(self):
self.s = Stack()
def tearDown(self):
while not self.s.isEmpty():
self.s.pop()
def test_push(self):
value = 'A'
self.s.push(value)
self.assertEqual(1, self.s.size())
print self.s.get()
x = self.s.pop()
print self.s.get()
self.assertEqual(value, x)
self.assertEqual(0, self.s.size())
def test_peek(self):
self.s.push('A')
self.s.push('B')
x = self.s.peek()
self.assertEqual('B', x)
self.assertEqual(2, self.s.size())
def test_empty(self):
self.assertEqual(self.s.peek(), None)
def check_balance(string):
'''
Check to see if we have balanced parethesis.
Parameters:
-----------
string: str. The string contains the text with parenthesis that needs to be check balanced.
Return:
Boolean. Tell if parenthesis is matched or not
'''
parethesis = Stack()
par_dict = {')': '(', '}': '{', ']': '['}
for s in string.strip():
if s in par_dict.values():
parethesis.push(s)
elif s in par_dict.keys():
try:
t = parethesis.pop()
if t != par_dict[s]:
return False
except TypeError:
return False
if parethesis.size() != 0:
return False
return True