diff -r a89469328b78 Doc/tools/extensions/pyspecific.py
--- a/Doc/tools/extensions/pyspecific.py	Thu Dec 15 05:37:56 2016 +0300
+++ b/Doc/tools/extensions/pyspecific.py	Wed Dec 14 20:42:57 2016 -0800
@@ -11,6 +11,8 @@
 
 import re
 import codecs
+import patchlevel
+
 from os import path
 from time import asctime
 from pprint import pformat
@@ -34,7 +36,7 @@
 
 
 ISSUE_URI = 'https://bugs.python.org/issue%s'
-SOURCE_URI = 'https://hg.python.org/cpython/file/3.5/%s'
+SOURCE_URI = 'https://github.com/python/cpython/blob/%s/%s'
 
 # monkey-patch reST parser to disable alphabetic and roman enumerated lists
 from docutils.parsers.rst.states import Body
@@ -90,7 +92,11 @@
     has_t, title, target = split_explicit_title(text)
     title = utils.unescape(title)
     target = utils.unescape(target)
-    refnode = nodes.reference(title, title, refuri=SOURCE_URI % target)
+    version, _ = patchlevel.get_version_info()
+    if version == "3.7":
+        version = "master"
+    refnode = nodes.reference(title, title,
+                              refuri=SOURCE_URI % (version, target))
     return [refnode], []