page =('</head><body><div id="header"><div class="mdiv"><div class="t-top"><a href="http://www.cnki.net" target="_blank">中国知网</a> |')
start_link =page.find('<a href=')
start_quote=page.find('"',start_link)#在start_link后,查找"的位置
#print (start_quote)
end_quote=page.find('"',start_quote+1)#在start_quote后,查找"的位置
#print (end_quote)
url=page[start_quote+1:end_quote]
print (url)












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