Check the balance of parenthesis in Python

def isbalanced(s):
    c= 0
    ans=False
    for i in s:
        if i == “(“:
            c += 1
        elif i == “)”:
            c-= 1
        if c < 0:
            return ans
    if c==0:
        return not ans
    return ans
s=input(“Enter a string of brackets: “) 
print(“Given string is balanced :”,isbalanced(s))