1487. Making File Names Unique

class Solution:
    def getFolderNames(self, names: List[str]) -> List[str]:
        d = defaultdict(int)
        for i, name in enumerate(names):
            if name in d:
                k = d[name]
                while f'{name}({k})' in d:
                    k += 1
                d[name] = k + 1
                names[i] = f'{name}({k})'
            d[names[i]] = 1
        return names