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from .stack import Stack

__author__ = "Omkar Pathak"

def balanced_parentheses(parentheses):

""" Use a stack to check if a string of parentheses is balanced."""

stack = Stack(len(parentheses))

for parenthesis in parentheses:

if parenthesis == "(":

stack.push(parenthesis)

elif parenthesis == ")":

if stack.is_empty():

return False

stack.pop()

return stack.is_empty()

if __name__ == "__main__":

examples = ["((()))", "((())", "(()))"]

print("Balanced parentheses demonstration:\n")

for example in examples:

print(example + ": " + str(balanced_parentheses(example)))