def isValid(s):
    """
    :type s: str
    :rtype: bool
    """
    stack = [] # only use append and pop
    pairs = {
        '(': ')',
        '{': '}',
        '[': ']'
    }
    for bracket in s:
        if bracket in pairs:
            stack.append(bracket)
        elif len(stack) == 0 or bracket != pairs[stack.pop()]: # Checks for corresponding dictionary value based on previous closing bracket
            return False
        print(stack)
    return len(stack) == 0



# print(isValid("()")) # true
print(isValid("()[]{}")) # true
print(isValid("(]")) # false
print(isValid("([)]")) # false
print(isValid("{[]}")) # true