python3.patch

diff --git a/sandbox/proxy.py b/sandbox/proxy.py
index 3365bcd..5b0526e 100644
--- a/sandbox/proxy.py
+++ b/sandbox/proxy.py
@@ -19,7 +19,7 @@ builtin_function_or_method = type(len)
 SAFE_TYPES = (
     NoneType,
     bool, int, int, float,
-    str, str,
+    bytes, str,
     FrameType,
 )
 
@@ -250,7 +250,7 @@ def _proxy():
         if isinstance(value, SAFE_TYPES):
             # Safe type, no need to create a proxy
             return value
-        elif isinstance(value, collections.Callable):
+        elif hasattr(value, '__call__'):
             return callback_proxy(proxy, value)
         elif isinstance(value, tuple):
             return tuple(
@@ -260,10 +260,8 @@ def _proxy():
             return createReadOnlyList(value)
         elif isinstance(value, dict):
             return createReadOnlyDict(value)
-        elif isinstance(value, OBJECT_TYPES):
-            return createReadOnlyObject(value)
         else:
-            raise TypeError("Unable to proxy a value of type %s" % type(value))
+            return createReadOnlyObject(value)
     return proxy
 proxy = _proxy()
 del _proxy
diff --git a/tests.py b/tests.py
index e83e148..bd47368 100644
--- a/tests.py
+++ b/tests.py
@@ -29,9 +29,12 @@ READ_FILENAME = realpath(__file__)
 del realpath
 
 def read_first_line(open):
-    with open(READ_FILENAME) as fp:
+    fp = open(READ_FILENAME, 'rb')
+    try:
         line = fp.readline()
-    assert line.rstrip() == '#!/usr/bin/env python'
+    finally:
+        fp.close()
+    assert line.rstrip() == b'#!/usr/bin/env python'
 
 if USE_CSANDBOX:
     def test_open_whitelist():
@@ -226,8 +229,11 @@ def test_filetype_from_sys_stdout():
 
 def get_file_type_from_open_file(filename):
     try:
-        with open(filename) as fp:
+        fp = open(filename)
+        try:
             return _get_file_type(fp)
+        finally:
+            fp.close()
     except SandboxError as err:
         pass