From 2e733c9625abf1912845d37e1eceeb3cc2873afa Mon Sep 17 00:00:00 2001
From: Alexander Belopolsky <alexander.belopolsky@gmail.com>
Date: Sun, 4 Jul 2010 17:00:20 +0000
Subject: [PATCH] Issue #9118: help(None) will now return NoneType doc instead
 of starting interactive help.

---
 Lib/pydoc.py | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/Lib/pydoc.py b/Lib/pydoc.py
index 2722a753fe2..95eb3183b78 100755
--- a/Lib/pydoc.py
+++ b/Lib/pydoc.py
@@ -1705,8 +1705,9 @@ class Helper:
             return ''
         return '<pydoc.Helper instance>'
 
-    def __call__(self, request=None):
-        if request is not None:
+    _GoInteractive = object()
+    def __call__(self, request=_GoInteractive):
+        if request is not self._GoInteractive:
             self.help(request)
         else:
             self.intro()