diff -r d60678a567a9 -r 328739ea70c3 mercurial/httpconnection.py
--- a/mercurial/httpconnection.py	Tue Jun 23 22:38:21 2015 -0700
+++ b/mercurial/httpconnection.py	Tue Jun 23 22:20:08 2015 -0700
@@ -211,7 +211,7 @@
                 path = '/' + path
             h.request(req.get_method(), path, req.data, headers)
             r = h.getresponse()
-        except socket.error, err: # XXX what error?
+        except socket.error as err: # XXX what error?
             raise urllib2.URLError(err)
 
         # Pick apart the HTTPResponse object to get the addinfourl