python之如何返回动态 json 作为来自谷歌云端点 python 的响应

我希望以下 json 从 google 端点返回

{"arts":[{"id":"4","name":"punjabi"},{"id":"5","name":"hindi"}],"Science":[{"id":"1","name":"MCA"},{"id":"2","name":"physics"},{"id":"3","name":"chemistry"}]} 

这是我声明端点的方式

@endpoints.method(TokenAsInput,GetDepartmentListOutput, 
                          path='getdepartmentlist', http_method='GET', 
                          name='GetDepartmentList') 
    def getDepartmentList(self,request): 
        objResult = GetDepartmentListOutput() 
        objResult.data = dynamicJson 
        return objResult 

但我不知道如何声明 GetDepartmentListOutput 以便它可以映射上面的 JSON。对象 'arts','science' 是动态的，可能存在也可能不存在。

请您参考如下方法:

我使用 ProtoRpc 消息(Cloud Endpoints 的基础)并使用以下内容返回一般 Json 消息数据:

from protorpc import messages 
 
class DetailMessage(messages.Message): 
    """ 
    General-format Json detail response 
    """ 
    data = GeneralField(1) 

设置结果:

data = {"arts":[{"id":"4","name":"punjabi"},{"id":"5","name":"hindi"}],"Science":[{"id":"1","name":"MCA"},{"id":"2","name":"physics"},{"id":"3","name":"chemistry"}]} 
return DetailMessage(data=data) 

GeneralField 定义为:

class GeneralField(messages.Field): 
    """ 
    Allow for normal non-Message objects to be serialised to JSON. 
    This allows for variable result objects or dictionaries to be returned (Note: these objects must be Json serialisable). 
    """ 
    VARIANTS = frozenset([messages.Variant.MESSAGE]) 
 
    DEFAULT_VARIANT = messages.Variant.MESSAGE 
 
    def __init__(self, 
                             number, 
                             required=False, 
                             repeated=False, 
                             variant=None): 
        """Constructor. 
 
        Args: 
            number: Number of field.  Must be unique per message class. 
            required: Whether or not field is required.  Mutually exclusive to 
                'repeated'. 
            repeated: Whether or not field is repeated.  Mutually exclusive to 
                'required'. 
            variant: Wire-format variant hint. 
 
        Raises: 
            FieldDefinitionError when invalid message_type is provided. 
        """ 
        super(GeneralField, self).__init__(number, 
                                                                             required=required, 
                                                                             repeated=repeated, 
                                                                             variant=variant) 
 
    def __set__(self, message_instance, value): 
        """Set value on message. 
 
        Args: 
            message_instance: Message instance to set value on. 
            value: Value to set on message. 
        """ 
        if isinstance(value, list): 
            if len(value) > 0: 
                self.type = type(value[0]) 
            else: 
                self.type = type(self)  
        else: 
            self.type = type(value) 
        self.__initialized = True 
 
        super(GeneralField, self).__set__(message_instance, value) 
 
    def __setattr__(self, name, value): 
        """Setter overidden to allow assignment to fields after creation. 
 
        Args: 
            name: Name of attribute to set. 
            value: Value to assign. 
        """ 
        object.__setattr__(self, name, value) 
 
    def value_from_message(self, message): 
        """Convert a message to a value instance. 
 
        Used by deserializers to convert from underlying messages to 
        value of expected user type. 
 
        Args: 
            message: A message instance of type self.message_type. 
 
        Returns: 
            Value of self.message_type. 
        """ 
        return message 
 
    def value_to_message(self, value): 
        """Convert a value instance to a message. 
 
        Used by serializers to convert Python user types to underlying 
        messages for transmission. 
 
        Args: 
            value: A value of type self.type. 
 
        Returns: 
            An instance of type self.message_type. 
        """ 
        return value 

注意:GeneralField 派生自其他 ProtoRpc Message 代码并覆盖 Field 的 set 和 setattr 方法以允许使用普通(json-serialisable)对象或字典在 ProtoRpc 消息中。您可能需要调整此方法以满足您的目的。

注意 2:我不确定 Cloud Endpoints 会喜欢这个，但它可能值得一试。