def isValid(s):
    """
    :type s: str
    :rtype: bool
    """
    pervious = ""
    openBracket = ['(', '{', '[']
    bracketPairs = ['()', '{}', '[]']
    pairs = None

    for x in s:
        if x in openBracket:
            previous = x
        else:
            # print(previous+x)
            if (previous+x) in bracketPairs:
                pairs = True
            else:
                return False
    return pairs

print(isValid("()"))
print(isValid("()[]{}"))
print(isValid("(]"))
print(isValid("([)]"))
print(isValid("{[]}"))
print(isValid("{[]}"))
print(isValid("{[]}"))
print(isValid("{[]}"))
print(isValid("{[]}"))
print(isValid("{[]}"))