因一些特殊需求需要以参数的形式获取字典中特定的值，网上搜了一下并没有特别好的实现 (并没有太认真去找~),所以自己实现了一个，以供大家参考:) 。

话不多说，直接上代码:

def dict_get(dic, locators, default=None):

    '''

    :param dic: 输入需要在其中取值的原始字典 <dict>
    :param locators: 输入取值定位器, 如:['result', 'msg', '-1', 'status'] <list>
    :param default: 进行取值中报错时所返回的默认值 (default: None)
    :return: 返回根据参数locators找出的值

    '''

    if not isinstance(dic, dict) or not isinstance(locators, list):
        return default

    value = None

    for locator in locators:
        if not type(value) in [dict, list] and isinstance(locator, str) and not can_convert_to_int(locator):
            try:
                value = dic[locator]
            except KeyError:
                return default
            continue
        if isinstance(value, dict):
            try:
                value = dict_get(value, [locator])
            except KeyError:
                return default
            continue
        if isinstance(value, list) and can_convert_to_int(locator):
            try:
                value = value[int(locator)]
            except IndexError:
                return default
            continue

    return value

def can_convert_to_int(input):
    try:
        int(input)
        return True
    except BaseException:
        return False

Best Practice

好的我们来进行一次简单的最佳实践:)

if __name__ == '__main__':
    dict_test = {"result": {"code": "110002", "msg": [{'status': 'ok'}, {'status': 'failed'}]}}
    result = dict_get(dict_test, ['result', 'msg', '-1', 'status'])
    print(result)

下面是控制台的输出，大家可以看到输出是符合预期结果的:)

failed

Process finished with exit code 0

这次分享到此为止~ 我们有缘再见:)