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26 lines
749 B
Python
26 lines
749 B
Python
from __future__ import print_function
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from __future__ import absolute_import
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from stack import Stack
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__author__ = 'Omkar Pathak'
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def balanced_parentheses(parentheses):
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""" Use a stack to check if a string of parentheses is balanced."""
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stack = Stack(len(parentheses))
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for parenthesis in parentheses:
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if parenthesis == '(':
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stack.push(parenthesis)
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elif parenthesis == ')':
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if stack.is_empty():
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return False
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stack.pop()
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return stack.is_empty()
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if __name__ == '__main__':
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examples = ['((()))', '((())', '(()))']
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print('Balanced parentheses demonstration:\n')
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for example in examples:
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print(example + ': ' + str(balanced_parentheses(example)))
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