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While the netloc/path parts of URLs are scheme-specific, and urlparse can be forgiven for refusing to parse them for unknown schemes, the query and fragment parts are standardized, and should be parsed for unrecognized schemes.
According to Wikipedia:
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Internet standard STD 66 (also RFC 3986) defines the generic syntax to be used in all URI schemes. Every URI is defined as consisting of four parts, as follows:
<scheme name> : <hierarchical part> [ ? <query> ] [ # <fragment> ]
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http://en.wikipedia.org/wiki/URI_scheme#Generic_syntax
Here is a demonstration of what urlparse currently does:
>>> urlparse.urlsplit('myscheme://netloc/path?a=b#frag')
SplitResult(scheme='myscheme', netloc='', path='//netloc/path?a=b#frag', query='', fragment='')
>>> urlparse.urlsplit('http://netloc/path?a=b#frag')
SplitResult(scheme='http', netloc='netloc', path='/path', query='a=b', fragment='frag')