hgweb: replace some str.split() calls by str.partition() or str.rpartition() Since Python 2.5 str has new methods: partition and rpartition. They are more specialized than the usual split and rsplit, and they sometimes convey the intent of code better and also are a bit faster (faster than split/rsplit with maxsplit specified). Let's use them in appropriate places for a small speedup. Example performance (partition): $ python -m timeit 'assert "apple|orange|banana".split("|")[0] == "apple"' 1000000 loops, best of 3: 0.376 usec per loop $ python -m timeit 'assert "apple|orange|banana".split("|", 1)[0] == "apple"' 1000000 loops, best of 3: 0.327 usec per loop $ python -m timeit 'assert "apple|orange|banana".partition("|")[0] == "apple"' 1000000 loops, best of 3: 0.214 usec per loop Example performance (rpartition): $ python -m timeit 'assert "apple|orange|banana".rsplit("|")[-1] == "banana"' 1000000 loops, best of 3: 0.372 usec per loop $ python -m timeit 'assert "apple|orange|banana".rsplit("|", 1)[-1] == "banana"' 1000000 loops, best of 3: 0.332 usec per loop $ python -m timeit 'assert "apple|orange|banana".rpartition("|")[-1] == "banana"' 1000000 loops, best of 3: 0.219 usec per loop

--- a/mercurial/hgweb/hgweb_mod.py	Mon Nov 02 23:37:14 2015 +0800
+++ b/mercurial/hgweb/hgweb_mod.py	Mon Nov 02 23:37:49 2015 +0800
@@ -304,8 +304,8 @@
                 parts = parts[len(repo_parts):]
             query = '/'.join(parts)
         else:
-            query = req.env['QUERY_STRING'].split('&', 1)[0]
-            query = query.split(';', 1)[0]
+            query = req.env['QUERY_STRING'].partition('&')[0]
+            query = query.partition(';')[0]
 
         # process this if it's a protocol request
         # protocol bits don't need to create any URLs