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Brackets solution in Clear category for Brackets by konradgolinski
def checkio(expression):
list = []
for s in expression:
if s in set(["(","{","["]):
list.append(s)
if s == "}":
if len(list) <= 0 or list[-1] != "{":
return False
list.pop()
if s == "]":
if len(list) <= 0 or list[-1] != "[":
return False
list.pop()
if s == ")":
if len(list) <= 0 or list[-1] != "(":
return False
list.pop()
if(len(list)) > 0:
return False
else:
return 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"
Nov. 20, 2016
