在可序列化JSON的Python对象中传递整数值

Question

我刚开始学习Python，最近遇到了一些问题。这里有一个用Python写的AWS Lambda函数，它会调用一个REST接口，代码是这样的：

requests.post(Url,headers=Headers,data=Payload)

在这个调用中，Payload是这样传递的：

Payload='[{"Code": "'+someCode+'","version": "v1","itemNumber": 1,"referenceId": "'+referenceId+'","alertBody": {"customerId": "'+customerId+'"},"Context":{"Id":"'+str(payload['body']['State']['Id'])+'","Name":"Payment","Expiration":0,"Action":"","sourceTimestamp":"'+ str(int(currentTime.timestamp()))+'","sourceApp":"someApp"}}]'

不过，由于最近API那边的格式发生了变化，导致这个功能不再正常工作。现在API希望接收到的"sourceTimestamp":"'+ str(int(currentTime.timestamp()))+'"字段是一个整数，而不是字符串（目前它是以字符串的形式发送的，如上面的Payload所示）。

有没有人能帮我一下，告诉我怎么把时间戳字段发送为整数而不是字符串？我想保持上面的Payload格式不变。

Answer 1

从一个Python对象生成数据会更少出错。简单来说，就是不要把数据当作字符串放进结构里。

import datetime as dt

# Fake data to make a working example
someCode = 'ABC'
referenceId = 'REF'
customerId = 'A123'
payload = {'body':{'State':{'Id':456}}}
currentTime = dt.datetime.now()
payload['body']['State']['Id']

Payload = json.dumps([
  {
    "Code": someCode,
    "version": "v1",
    "itemNumber": 1,
    "referenceId": referenceId,
    "alertBody": {
      "customerId": "A123"
    },
    "Context": {
      "Id": str(payload['body']['State']['Id']),
      "Name": "Payment",
      "Expiration": 0,
      "Action": "",
      "sourceTimestamp": int(currentTime.timestamp()),  # don't wrap in str() and won't be quoted
      "sourceApp": "someApp"
    }
  }
])

print(Payload)

输出结果：

[{"Code": "ABC", "version": "v1", "itemNumber": 1, "referenceId": "REF", "alertBody": {"customerId": "A123"}, "Context": {"Id": "456", "Name": "Payment", "Expiration": 0, "Action": "", "sourceTimestamp": 1711733124, "sourceApp": "someApp"}}]

Answer 2

在Json中，整数不能用双引号包起来。所以你只需要把 str(int(currentTime.timestamp())) 周围的双引号去掉就可以了。