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11-liner: lightning solution in Speedy category for Brackets by przemyslaw.daniel
brackets = (('(', ')'), ('{', '}'), ('[', ']'))
def checkio(expression):
last = []
for i in expression:
if i in '({[':
last += [i]
if i in ')}]':
if not last or (last.pop(), i) not in brackets:
return False
return not last
Nov. 21, 2017
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