在Python中规范化（映射）JSON响应

Question

我有一个我通过request检索的对象，我需要将其映射并规范化为预期的响应：

address_list = list(map(normalize_shipping_address, address_list))

我希望能够设置某种dict来处理映射，例如：

def normalize_shipping_address(address):

    normalized_address = {}

    valueMapping = {
        'firstname': 'firstName',
        'lastname': 'lastName',
        'city': 'city',
        'postcode': 'zip',
        'countryId': 'country',
        'defaultShipping': 'isDefault',
    }

    for source_key, destination_key in valueMapping.iteritems():
        try:
            key = address[source_key]
        except KeyError:
            key = None
        normalized_address[destination_key] = key

    return normalized_address

但意识到我没有一个好方法来获取嵌套字典键或列表对象，例如：address.some.nested.key或address.some.list[0].key。

我最终处理了这些特殊的案件＆＃34;通过做以下事情：

try:
    state = address['region']['regionCode']
except KeyError:
    state = None
normalized_address['state'] = state

和

try:
    address_name = address['customAttributes'][0]['value']
except KeyError:
    address_name = None
normalized_address['addressName'] = address_name

这似乎有点冗长和笨重。是否有更优雅的方法来解析/规范化这样的词典？