Python3.x执行POST请求是出现POST data should be bytes or an iterable of bytes. It cannot be of type str.错误
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在使用Python3.6.1做一个小型爬虫时出现了下面的错误：
开始我是这么写的：data = urllib.parse.urlencode(values)，出现了上面的那种错误。values为POST请求的数据。
研究错误日志发现是请求的数据的类型出现的问题，应该指定一种编码格式进行编码。
最后将代码更改为如下形式后问题得到解决：
data = urllib.parse.urlencode(values).encode(encoding=’UTF8’)
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