Provide links to Python source where the code is short, readable and
informative adjunct to the docs.  Forward-port of Raymond's r86225 and
r86245 using the new source reST role added in #10334.
diff --git a/Doc/library/tokenize.rst b/Doc/library/tokenize.rst
index 6a96609..d7ae638 100644
--- a/Doc/library/tokenize.rst
+++ b/Doc/library/tokenize.rst
@@ -12,6 +12,11 @@
 as well, making it useful for implementing "pretty-printers," including
 colorizers for on-screen displays.
 
+.. seealso::
+
+   Latest version of the :source:`tokenize module Python source code
+   <Lib/tokenize.py>`
+
 The primary entry point is a :term:`generator`:
 
 .. function:: tokenize(readline)