Port abbreviate.py. As far as I can tell, all division is already float division.

src/allmydata/test/test_abbreviate.py

@@ -1,6 +1,14 @@
 """
 Tests for allmydata.util.abbreviate.
 """
+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 builtins import filter, map, zip, ascii, chr, hex, input, next, oct, open, pow, round, super, bytes, dict, int, list, object, range, str, max, min  # noqa: F401
 
 from datetime import timedelta
 

src/allmydata/util/_python3.py

@@ -15,6 +15,7 @@ if PY2:
 
 # Keep these sorted alphabetically, to reduce merge conflicts:
 PORTED_MODULES = [
+    "allmydata.util.abbreviate",
     "allmydata.util.assertutil",
     "allmydata.util.deferredutil",
     "allmydata.util.humanreadable",
@@ -27,6 +28,7 @@ PORTED_MODULES = [
 ]
 
 PORTED_TEST_MODULES = [
+    "allmydata.test.test_abbreviate",
     "allmydata.test.test_deferredutil",
     "allmydata.test.test_humanreadable",
     "allmydata.test.test_python3",

src/allmydata/util/abbreviate.py

@@ -1,3 +1,11 @@
+from __future__ import division
+from __future__ import absolute_import
+from __future__ import print_function
+from __future__ import unicode_literals
+
+from future.utils import PY2
+if PY2:
+    from builtins import filter, map, zip, ascii, chr, hex, input, next, oct, open, pow, round, super, bytes, dict, int, list, object, range, str, max, min  # noqa: F401
 
 import re
 from datetime import timedelta