Python Code Snippet: Understanding Link Filtering in Web Scraping

'lnk' is likely a variable name in a code snippet. It is being used in a loop to iterate over the links extracted by the 'link_extractor' object. The condition 'if lnk not in seen' suggests that the links are being filtered to exclude those that have already been seen before. The meaning of 'seen' would depend on its context, but it could refer to a set or list of previously visited links.