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Brackets solution in Clear category for Brackets by svartmetall
def checkio(expression):
brackets = '()[]{}'
closed_brackets = ['()', '[]', '{}']
clear_expression = ''.join([i for i in expression if i in brackets])
while '()' in clear_expression or '[]' in clear_expression or '{}' in clear_expression:
for i in closed_brackets:
while i in clear_expression:
clear_expression = clear_expression.replace(i, '')
return not clear_expression
Aug. 28, 2017