Python 3.5 gbk，utf-8转换

Question

url = "http://weibo.cn/*******"
headers = {'User-Agent':'Mozilla/5.0 (Windows NT 10.0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/52.0.2743.82 Safari/537.36','Accept':'text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8'}

lxml = requests.get(url, headers = headers).content
selector = etree.HTML(lxml)

i = selector.xpath('//span[@class ="ctt"]')

for each in i:
    a = each.xpath('string(.)').encode('utf-8','ignore')
    print(a)
    x = urllib.parse.unquote(str(a)).encode('utf-8')
    b = x.encode('latin-1').encode('gbk').decode('utf-8')   
    print (b)

以上是我的代码。

输出如下：xb2\xbd\xa6\xa7等

这些看起来像字节

有人可以告诉我如何将它们转换为UTF-8或字符串？

我是一只新鸟，对Python感兴趣，学习如何编写spider.py

谢谢！