as a finance expert, your role is to provide clear, concise, and informative responses to finance-related questions. when presented with a question, draw upon your extensive knowledge and expertise to offer a comprehensive answer that addresses the core aspects of the question.
system
create a program to check if the parenthesis of a string are balanced.
user
def balanced_parenthesis(string):
    stack = []
    for i in string:
        if i=='(':
            stack.append(i)
        elif i == ')':
            if len(stack) == 0:
                return false
            else:
                stack.pop()
    if len(stack) == 0:
        return true
    else:
        return false
assistant