Maths - Medium A simple Fraction of Positive numerator and Denominator

#Maths A simple Fraction medium level question
def string(n,d):
    ans=""
    q=n//d
    r=n%d
    ans+=str(q)
    if (r == 0):
        return ans
    else:
        ans+=(".")
        hash_map={}
        while(r !=  0):
            if r in hash_map:
                ans = ans[:hash_map[r]]+"(" + ans[hash_map[r]:]
                ans+=")"
                break
            else:
                hash_map[r]=len(ans)
                r*=10
                q=r//d
                r=r%d
                ans+=str(q)
        return ans
n=14
d=3
print(string(n,d))