将cURL JSON数据转换为pycurl

如何解决将cURL JSON数据转换为pycurl

我有此cURL命令，该命令从某个网站返回JSON文件：

curl -H "Content-Type:application/json" 
-d "{'item':'item-xyz',orientation:LANDSCAPE,choice:null}"
https://api.website.com/jsonApi/product/formatandPrice

但是，此Python代码不起作用，网站返回了错误：

import pycurl
from io import BytesIO

crl = pycurl.Curl()

file = open('out.json','wb')
crl.setopt(crl.WRITEDATA,file)

data = '{"item":"item-xyz","orientation":"LANDSCAPE","choice":null}'
buffer = BytesIO(data.encode('utf-8'))
crl.setopt(crl.READDATA,buffer)

crl.setopt(crl.HTTPHEADER,['Content-Type: application/json'])
crl.setopt(crl.URL,"https://api.website.com/jsonApi/product/formatandPrice")

crl.perform()
crl.close()

我做错了什么？