Reconstructing absolute urls from relative urls on a page

Question

Given an absolute url of a page, and a relative link found within that page, would there be a way to a) definitively reconstruct or b) best

Answer 1

very simple:

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