Python3.x：报错POST data should be bytes, an iterable of bytes
问题：
python3.x：报错
POST data should be bytes, an iterable of bytes, or a file object. It cannot be of type str.
原因：
# 组装GET方法的请求
request = urllib2.Request(url, data, headers)
其中的data需要转为utf-8
解决方案：
# 组装GET方法的请求
#将代码request = urllib2.Request(url, data, headers) 更改为
request = urllib.request.Request(url, data=urllib.parse.urlencode(data).encode(encoding='UTF8'), headers=headers)