socket.error：[Errno 32]管道错误

Question

当我运行Virustotal提供的代码时，我收到此错误：

socket.error: [Errno 32] Broken pipe error

我在Python中天真，任何帮助都将受到高度赞赏..

import postfile
host = "www.virustotal.com"
selector = "https://www.virustotal.com/vtapi/v2/file/scan"
fields = [("apikey", "1fe0ef5feca2f84eb450bc3617f839e317b2a686af4d651a9bada77a522201b0")]
file_to_send = open("test.txt", "rb").read()
files = [("file", "test.txt", file_to_send)]
json = postfile.post_multipart(host, selector, fields, files)
print json