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import re def checkio(expression): pattern = '({}|\[\]|\(\))' matcher = re.compile(pattern) brackets = ''.join(x for x in expression if x in '{}[]()') while True: m = matcher.search(brackets) if not m: break brackets = brackets.replace(m.group(), '') return False if brackets else True #These "asserts" using only for self-checking and not necessary for auto-testing if __name__ == '__main__': assert checkio("((5+3)*2+1)") == True, "Simple" assert checkio("{[(3+1)+2]+}") == True, "Different types" assert checkio("(3+{1-1)}") == False, ") is alone inside {}" assert checkio("[1+1]+(2*2)-{3/3}") == True, "Different operators" assert checkio("(({[(((1)-2)+3)-3]/3}-3)") == False, "One is redundant" assert checkio("2+3") == True, "No brackets, no problem" |
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