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Balanced parentheses fix #664

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Merged
merged 3 commits into from
Dec 17, 2018
Merged

Balanced parentheses fix #664

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2d082cf
Changed import from .Stack to stack
Dec 17, 2018
a8cfc14
Added more parentheses examples
Dec 17, 2018
2e2fadf
Fixed bug where an empty stack would cause error
Dec 17, 2018
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8 changes: 5 additions & 3 deletions data_structures/stacks/balanced_parentheses.py
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Original file line number Diff line number Diff line change
@@ -1,6 +1,6 @@
from __future__ import print_function
from __future__ import absolute_import
from .Stack import Stack
from stack import Stack

__author__ = 'Omkar Pathak'

Expand All @@ -12,12 +12,14 @@ def balanced_parentheses(parentheses):
if parenthesis == '(':
stack.push(parenthesis)
elif parenthesis == ')':
if stack.is_empty():
return False
stack.pop()
return not stack.is_empty()
return stack.is_empty()


if __name__ == '__main__':
examples = ['((()))', '((())']
examples = ['((()))', '((())', '(()))']
print('Balanced parentheses demonstration:\n')
for example in examples:
print(example + ': ' + str(balanced_parentheses(example)))