diff --git a/Demo/classes/Range.py b/Demo/classes/Range.py
index 0f84157..a0cef74 100755
--- a/Demo/classes/Range.py
+++ b/Demo/classes/Range.py
@@ -64,9 +64,9 @@
 
 
 def test():
-    import time, __builtin__
+    import time, builtins
     #Just a quick sanity check
-    correct_result = __builtin__.range(5, 100, 3)
+    correct_result = builtins.range(5, 100, 3)
     oldrange_result = list(oldrange(5, 100, 3))
     genrange_result = list(genrange(5, 100, 3))
     if genrange_result != correct_result or oldrange_result != correct_result:
@@ -81,7 +81,7 @@
     for i in genrange(1000):
         pass
     t3 = time.time()
-    for i in __builtin__.range(1000):
+    for i in builtins.range(1000):
         pass
     t4 = time.time()
     print(t2-t1, 'sec (old-style class)')
diff --git a/Demo/imputil/knee.py b/Demo/imputil/knee.py
index 49fdf2b..435b51c 100644
--- a/Demo/imputil/knee.py
+++ b/Demo/imputil/knee.py
@@ -7,7 +7,7 @@
 
 """
 
-import sys, imp, __builtin__
+import sys, imp, builtins
 
 
 # Replacement for __import__()
@@ -117,7 +117,7 @@
 
 
 # Save the original hooks
-original_import = __builtin__.__import__
+original_import = builtins.__import__
 
 # Now install our hooks
-__builtin__.__import__ = import_hook
+builtins.__import__ = import_hook
diff --git a/Demo/pdist/client.py b/Demo/pdist/client.py
index 13158f2..c9fe369 100755
--- a/Demo/pdist/client.py
+++ b/Demo/pdist/client.py
@@ -3,7 +3,7 @@
 import sys
 import socket
 import pickle
-import __builtin__
+import builtins
 import os
 
 
@@ -90,8 +90,8 @@
         if exception is None:
             return value
         x = exception
-        if hasattr(__builtin__, exception):
-            x = getattr(__builtin__, exception)
+        if hasattr(builtins, exception):
+            x = getattr(builtins, exception)
         elif exception in ('posix.error', 'mac.error'):
             x = os.error
         if x == exception: