Use absolute import

sandbox/attributes.py

@@ -1,3 +1,4 @@
+from __future__ import absolute_import
 from types import FunctionType, FrameType, GeneratorType
 from sys import version_info
 try:

sandbox/blacklist_proxy.py

@@ -5,7 +5,7 @@
 inherit from dict: Python/ceval.c uses PyDict_SetItem() and an inlined version
 of PyDict_GetItem().
 """
-
+from __future__ import absolute_import
 from .proxy import readOnlyError
 
 def createReadOnlyBuiltins(builtins):

sandbox/builtins.py

@@ -1,3 +1,4 @@
+from __future__ import absolute_import
 import __builtin__ as BUILTINS_MODULE
 from types import FrameType
 from sys import _getframe, version_info

sandbox/code.py

@@ -1,3 +1,4 @@
+from __future__ import absolute_import
 from sandbox import Protection
 from _sandbox import disable_code_new, restore_code_new
 

sandbox/cpython.py

@@ -1,3 +1,4 @@
+from __future__ import absolute_import
 from sandbox import HAVE_CSANDBOX
 if HAVE_CSANDBOX:
     from _sandbox import dictionary_of

sandbox/proxy.py

@@ -1,7 +1,7 @@
 """
 Proxies using a whitelist policy.
 """
-
+from __future__ import absolute_import
 from sys import version_info
 if version_info < (3, 0):
     from types import NoneType, ClassType, InstanceType

sandbox/recursion.py

@@ -1,3 +1,4 @@
+from __future__ import absolute_import
 import sys
 
 class SetRecursionLimit:

sandbox/restorable_dict.py

@@ -1,3 +1,5 @@
+from __future__ import absolute_import
+
 class RestorableDict:
     def __init__(self, dict):
         self.dict = dict

sandbox/safe_import.py

@@ -1,3 +1,4 @@
+from __future__ import absolute_import
 from .proxy import proxy, readOnlyError
 
 def createSafeModule(real_module, attributes, safe_attributes):

sandbox/safe_open.py

@@ -1,3 +1,4 @@
+from __future__ import absolute_import
 from os.path import realpath
 from .proxy import createReadOnlyObject
 from errno import EACCES

sandbox/stdio.py

@@ -1,3 +1,4 @@
+from __future__ import absolute_import
 import sys
 from sandbox import SandboxError