AttributeError: 'set' object has no attribute 'items'

import requests from lxml import etree url = ‘https://www.csdn.net/’ header = {‘user-agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.97 Safari/5

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