Port to Python 3.

src/allmydata/immutable/checker.py

@@ -1,3 +1,15 @@
+"""
+Ported to Python 3.
+"""
+from __future__ import absolute_import
+from __future__ import division
+from __future__ import print_function
+from __future__ import unicode_literals
+
+from future.utils import PY2
+if PY2:
+    from future.builtins import filter, map, zip, ascii, chr, hex, input, next, oct, open, pow, round, super, bytes, dict, list, object, range, str, max, min  # noqa: F401
+
 from zope.interface import implementer
 from twisted.internet import defer
 from foolscap.api import DeadReferenceError, RemoteException

src/allmydata/util/_python3.py

@@ -35,6 +35,7 @@ PORTED_MODULES = [
     "allmydata.crypto.rsa",
     "allmydata.crypto.util",
     "allmydata.hashtree",
+    "allmydata.immutable.checker",
     "allmydata.immutable.downloader",
     "allmydata.immutable.downloader.common",
     "allmydata.immutable.downloader.fetcher",