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replace solution in Creative category for Brackets by Sim0000
def checkio(expression):
s = ''.join([c for c in expression if c in '{}()[]'])
old = 0
while old != len(s):
old = len(s)
s = s.replace('{}', '').replace('()', '').replace('[]', '')
return len(s) == 0
# Remove '{}', '()', '[]' until can't remove.
#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"
March 20, 2014
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