This module defines a standard interface to break URL strings up in components (addessing scheme, network location, path etc.), to combine the components back into a URL string, and to convert a ``relative URL'' to an absolute URL given a ``base URL.''
The module has been designed to match the Internet RFC on Relative Uniform Resource Locators (and discovered a bug in an earlier draft!). Refer to RFC 1808 for details on relative URLs and RFC 1738 for information on basic URL syntax.
It defines the following functions:
scheme://netloc/path;parameters?query#fragment. Each tuple item is a string, possibly empty. The components are not broken up in smaller parts (e.g. the network location is a single string), and % escapes are not expanded. The delimiters as shown above are not part of the tuple items, except for a leading slash in the path component, which is retained if present.
('http', 'www.cwi.nl:80', '/%7Eguido/Python.html', '', '', '')
If the allow_fragments argument is zero, fragment identifiers
are not allowed, even if the URL's addressing scheme normally does
support them. The default value for this argument is
urlparse(). This may result in a slightly different, but equivalent URL, if the URL that was parsed originally had redundant delimiters, e.g. a ? with an empty query (the draft states that these are equivalent).