如何将哈希中的"点符号"字符串键转换为嵌套哈希？

def convert_hash(hash):
    nested_hash = {}
    for key, value in hash.items():
        keys = key.split('.')
        current_hash = nested_hash
        for i in range(len(keys)-1):
            if keys[i] not in current_hash:
                current_hash[keys[i]] = {}
            current_hash = current_hash[keys[i]]
        current_hash[keys[-1]] = value
    return nested_hash

# 示例用法
hash = {
    "a.b.c": 1,
    "a.b.d": 2,
    "e.f": 3
}
nested_hash = convert_hash(hash)
print(nested_hash)

{
    "a": {
        "b": {
            "c": 1,
            "d": 2
        }
    },
    "e": {
        "f": 3
    }
}