From 3672aa2dcdd8898ff520aa3885f8444ac73a2b2c Mon Sep 17 00:00:00 2001
From: Guido van Rossum <guido@python.org>
Date: Wed, 29 May 1996 00:02:30 +0000
Subject: [PATCH] change DumbWriter to derive from NullWriter

---
 Lib/formatter.py | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/Lib/formatter.py b/Lib/formatter.py
index 985f4fb430f..026637940e5 100644
--- a/Lib/formatter.py
+++ b/Lib/formatter.py
@@ -262,6 +262,7 @@ class AbstractFormatter:
 class NullWriter:
     """Minimal writer interface to use in testing.
     """
+    def __init__(self): pass
     def new_alignment(self, align): pass
     def new_font(self, font): pass
     def new_margin(self, margin, level): pass
@@ -275,7 +276,7 @@ class NullWriter:
     def send_literal_data(self, data): pass
 
 
-class AbstractWriter:
+class AbstractWriter(NullWriter):
 
     def __init__(self):
 	pass
@@ -314,12 +315,12 @@ class AbstractWriter:
 	print "send_literal_data(%s)" % `data`
 
 
-class DumbWriter(AbstractWriter):
+class DumbWriter(NullWriter):
 
     def __init__(self, file=None, maxcol=72):
 	self.file = file or sys.stdout
 	self.maxcol = maxcol
-	AbstractWriter.__init__(self)
+	NullWriter.__init__(self)
 	self.reset()
 
     def reset(self):