如何通过循环嵌套字典和列表到字典？

nested_dict = {}

data = {
    'key1': ['value1', 'value2'],
    'key2': {
        'subkey1': 'subvalue1',
        'subkey2': 'subvalue2',
        'subkey3': ['subvalue3', 'subvalue4']
    },
    'key3': 'value3'
}

for key, value in data.items():
    if isinstance(value, list):
        nested_dict[key] = []
        for item in value:
            nested_dict[key].append(item)
    elif isinstance(value, dict):
        nested_dict[key] = {}
        for subkey, subvalue in value.items():
            if isinstance(subvalue, list):
                nested_dict[key][subkey] = []
                for item in subvalue:
                    nested_dict[key][subkey].append(item)
            else:
                nested_dict[key][subkey] = subvalue
    else:
        nested_dict[key] = value

print(nested_dict)