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>>> split_url_into_path_query_fragment('http://path#frag?ment')
('http://path', '', '#frag?ment')
>>> split_url_into_path_query_fragment('http://path?a=1&b=2')
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>>> concat_path_query_fragment('/wiki/page', '?version=1')
'/wiki/page?version=1'
>>> concat_path_query_fragment('/wiki/page#a', '?version=1', '#b')
'/wiki/page?version=1#b'
>>> concat_path_query_fragment('/wiki/page?version=1#a', '?format=txt')
'/wiki/page?version=1&format=txt#a'
>>> concat_path_query_fragment('/wiki/page?version=1', '&format=txt')
'/wiki/page?version=1&format=txt'
>>> concat_path_query_fragment('/wiki/page?version=1', 'format=txt')
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