commit 5b63acd31e0e40c1a9a9e9762905b0054ff37994
author Benjamin Peterson <benjamin@python.org> Sat Mar 29 15:24:25 2008 +0000
committer Benjamin Peterson <benjamin@python.org> Sat Mar 29 15:24:25 2008 +0000
tree 763a6e10d4c0fa64797f5311491a3cbeb0f7e5d9
parent 672fbf519568bc295aa64992dcbabe0eebccb5fc

#2503 make singletons compared with "is" not == or !=
Thanks to Wummel for the patch

Demo/tkinter/guido/paint.py

diff --git a/Demo/tkinter/guido/paint.py b/Demo/tkinter/guido/paint.py
index d46e20b..7b2e814 100644
--- a/Demo/tkinter/guido/paint.py
+++ b/Demo/tkinter/guido/paint.py
@@ -50,7 +50,7 @@
 def motion(event):
     if b1 == "down":
         global xold, yold
-        if xold != None and yold != None:
+        if xold is not None and yold is not None:
             event.widget.create_line(xold,yold,event.x,event.y,smooth=TRUE)
                           # here's where you draw it. smooth. neat.
         xold = event.x