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Bracket Stack - Bracket Dictionary solution in Clear category for Brackets by mlahor
def checkio(expression):
bracket_dict = {'(':')', '[':']', '{':'}'}
bracket_stack = []
for c in expression:
if c in bracket_dict.keys():
bracket_stack.append(c)
if c in bracket_dict.values():
if not len(bracket_stack) or c != bracket_dict[bracket_stack.pop()]:
return False
return not len(bracket_stack)
Feb. 28, 2021
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