Recently I need to combine a absolute link with a relative link, so I tried to hard code it but failed. After checking online, there is actually a lib in Python called urlparse that have a function to combine this kind of url. the use is also simple:

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from urlparse import urljoin
urljoin('http://mysite.com/foo/bar/x.html', '../../images/img.png')
#'http://mysite.com/images/img.png'