diff -r be3b41703822 Lib/bz2.py
--- a/Lib/bz2.py	Tue Mar 10 16:32:50 2015 +0100
+++ b/Lib/bz2.py	Tue Mar 10 11:13:16 2015 -0700
@@ -9,6 +9,7 @@
 
 __author__ = "Nadeem Vawda <nadeem.vawda@gmail.com>"
 
+from builtins import open as _builtin_open
 import io
 import warnings
 
@@ -27,8 +28,6 @@
 
 _BUFFER_SIZE = 8192
 
-_builtin_open = open
-
 
 class BZ2File(io.BufferedIOBase):
 
diff -r be3b41703822 Lib/tarfile.py
--- a/Lib/tarfile.py	Tue Mar 10 16:32:50 2015 +0100
+++ b/Lib/tarfile.py	Tue Mar 10 11:13:16 2015 -0700
@@ -38,6 +38,7 @@
 #---------
 # Imports
 #---------
+from builtins import open as bltn_open
 import sys
 import os
 import io
@@ -2433,7 +2434,6 @@
     except TarError:
         return False
 
-bltn_open = open
 open = TarFile.open
 
 
diff -r be3b41703822 Lib/tokenize.py
--- a/Lib/tokenize.py	Tue Mar 10 16:32:50 2015 +0100
+++ b/Lib/tokenize.py	Tue Mar 10 11:13:16 2015 -0700
@@ -24,6 +24,7 @@
 __credits__ = ('GvR, ESR, Tim Peters, Thomas Wouters, Fred Drake, '
                'Skip Montanaro, Raymond Hettinger, Trent Nelson, '
                'Michael Foord')
+from builtins import open as _builtin_open
 from codecs import lookup, BOM_UTF8
 import collections
 from io import TextIOWrapper
@@ -429,8 +430,6 @@
     return default, [first, second]
 
 
-_builtin_open = open
-
 def open(filename):
     """Open a file in read only mode using the encoding detected by
     detect_encoding().
diff -r be3b41703822 Tools/freeze/bkfile.py
--- a/Tools/freeze/bkfile.py	Tue Mar 10 16:32:50 2015 +0100
+++ b/Tools/freeze/bkfile.py	Tue Mar 10 11:13:16 2015 -0700
@@ -1,4 +1,4 @@
-_orig_open = open
+from builtins import open as _orig_open
 
 class _BkFile:
     def __init__(self, file, mode, bufsize):