我在python lambda处理程序中找不到回调参数 [英] I can't find callback parameter in python lambda handler

问题描述

我正在研究aws lambda-lex，我发现使用node.js的Coffee bot示例代码.

I'm studying for aws lambda - lex and I found coffee bot sample code with node.js.

// --------------- Main handler -----------------------
// --------------- in node.js -----------------------

// Route the incoming request based on intent.
// The JSON body of the request is provided in the event slot.

exports.handler = (event, context, callback) => {
    try {
        dispatch(event, (response) => callback(null, response));
    } catch (err) {
        callback(err);
    }
};

我想使用回调参数，但是我在python中找不到

I want use callback parameter but i can't find it in python

// --------------- Main handler -----------------------
// --------------- in python -----------------------

def lambda_handler(event, context):    
    dispatch(event)

# >>> this handler doesn't include callback <<<

如果需要，将两者进行比较

If you need, compare both about

Python文档 vs node.js文档

实际上我想获得此功能(向lex生成消息)

Actually I want to get this function (build message to lex)

callback(elicitSlot(outputSessionAttributes, intentRequest.currentIntent.name, slots, 'BeverageType', 
                buildMessage('Sorry, but we can only do a mocha or a chai. What kind of beverage would you like?'), 
                buildResponseCard("Menu", "Today's Menu", menuItem)));

完整的示例代码在此处( https://github.com/awslabs/amz-ai-building-better-bots/blob/master/src/index.js )

full sample code is here (https://github.com/awslabs/amz-ai-building-better-bots/blob/master/src/index.js)

有人可以帮助我吗?

推荐答案

使用回调是NodeJS中常用的一种模式，用于管理异步执行.对于此特定用例，您不需要在Python中使用它.

Using callbacks is a pattern commonly-used in NodeJS for managing asynchronous execution. You don't need it in Python (for this specific use-case).

NodeJS中的此代码段...

This snippet in NodeJS...

callback(null, response)

等效于

return response

在Python中.

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