Python 3.x microsoft情感api视频Python 3中的错误消息

我试着从一段视频中了解情绪

下面是我的代码

当我运行此代码时，总是会出现此错误

b'{“error”：{“code”：“BadArgument”，“message”：“未能反序列化JSON请求。”}}知道原因吗？

import http.client, urllib.request, urllib.parse, urllib.error, base64, sys

headers = {

'Content-Type': 'application/json',
'Ocp-Apim-Subscription-Key': 'xxxxxxxxxxx',
}

params = urllib.parse.urlencode({
})




body = "{ 'url': 'http://www.dropbox.com/s/zfmaswf8s9c58om/blog2.mp4' }"

try:

  conn = http.client.HTTPSConnection('westus.api.cognitive.microsoft.com')
   conn.request("POST", "/emotion/v1.0/recognizeinvideo?%s" % params, "
  {body}", headers)
   response = conn.getresponse()
  data = response.read()
  print(data)
  conn.close()
except Exception as e:
  print(e.args)

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你忘了用真实的东西替换占位符

{body}

conn.request("POST", "/emotion/v1.0/recognizeinvideo?%s" % params, body, headers)

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请格式化python代码，使其易于阅读！