From 27c4e88552662c9b14496d4793e162e6d6481c96 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Charles-Fran=C3=A7ois=20Natali?= <neologix@free.fr>
Date: Wed, 27 Jul 2011 19:40:02 +0200
Subject: [PATCH] Issue #12603: Fix pydoc.synopsis() on files with non-negative
 st_mtime.

---
 Lib/pydoc.py | 4 ++--
 Misc/NEWS    | 2 ++
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/Lib/pydoc.py b/Lib/pydoc.py
index aa4b6d5c4fa..34b2f516688 100755
--- a/Lib/pydoc.py
+++ b/Lib/pydoc.py
@@ -224,8 +224,8 @@ def source_synopsis(file):
 def synopsis(filename, cache={}):
     """Get the one-line summary out of a module file."""
     mtime = os.stat(filename).st_mtime
-    lastupdate, result = cache.get(filename, (0, None))
-    if lastupdate < mtime:
+    lastupdate, result = cache.get(filename, (None, None))
+    if lastupdate is None or lastupdate < mtime:
         info = inspect.getmoduleinfo(filename)
         try:
             file = tokenize.open(filename)
diff --git a/Misc/NEWS b/Misc/NEWS
index 7da5eaab028..e7c3a75a37b 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -37,6 +37,8 @@ Core and Builtins
 Library
 -------
 
+- Issue #12603: Fix pydoc.synopsis() on files with non-negative st_mtime.
+
 - Issue #12607: In subprocess, fix issue where if stdin, stdout or stderr is
   given as a low fd, it gets overwritten.