在KeyError中使用嵌套的for循环fresult从嵌套字典中检索项

nested_dict = {
    'key1': {
        'subkey1': 'value1',
        'subkey2': 'value2'
    },
    'key2': {
        'subkey3': 'value3',
        'subkey4': 'value4'
    }
}

def find_item(dictionary, keys):
    try:
        result = dictionary
        for key in keys:
            result = result[key]
        return result
    except KeyError:
        raise KeyError("Item not found")

# 示例用法
try:
    fresult = find_item(nested_dict, ['key1', 'subkey2'])
    print(fresult)
except KeyError as e:
    print(str(e))