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I tried to be more strict, and I was bitten by tests: test_urllib fails on splittype("data:...") where (...) contains newlines characters. One example:
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ERROR: test_read_text_base64 (test.test_urllib.urlopen_DataTests)
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Traceback (most recent call last):
 File "/home/travis/build/python/cpython/Lib/test/test_urllib.py", line 511, in setUp
 self.image_url_resp = urllib.request.urlopen(self.image_url)
 File "/home/travis/build/python/cpython/Lib/urllib/request.py", line 222, in urlopen
 return opener.open(url, data, timeout)
 File "/home/travis/build/python/cpython/Lib/urllib/request.py", line 510, in open
 req = Request(fullurl, data)
 File "/home/travis/build/python/cpython/Lib/urllib/request.py", line 328, in __init__
 self.full_url = url
 File "/home/travis/build/python/cpython/Lib/urllib/request.py", line 354, in full_url
 self._parse()
 File "/home/travis/build/python/cpython/Lib/urllib/request.py", line 383, in _parse
 raise ValueError("unknown url type: %r" % self.full_url)
ValueError: unknown url type: 'data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAIAAAABCAIAAAB7\nQOjdAAAAAXNSR0IArs4c6QAAAA9JREFUCNdj%0AYGBg%2BP//PwAGAQL%2BCm8 vHgAAAABJRU5ErkJggg%3D%3D%0A%20'
I modified splittype() to reject newlines before the type, but accept them after the type.