fix TypeError on b.viewitems()

CHANGELOG.rst

@@ -6,13 +6,19 @@ Changelog
 .. include:: release-notifications.rst.inc
 
 
-0.14.1 (2017-11-28)
--------------------
+0.14.1 (not yet released)
+-------------------------
 
-- Fix a bug where hashing a :class:`frozenbidict <bidict.frozenbidict>`\’s
-  inverse (e.g. ``f = frozenbidict(); {f.inv: 'oops'}``) would result in
-  ``AttributeError: 'frozenbidict' object has no attribute '_hash'``.
+- Fix a bug introduced in 0.14.0 where hashing a
+  :class:`frozenbidict <bidict.frozenbidict>`\’s inverse
+  (e.g. ``f = frozenbidict(); {f.inv: '...'}``)
+  would cause an ``AttributeError``.
 
+- Fix a bug introduced in 0.14.0 for Python 2 users where calling
+  :meth:`bidict.viewitems() <bidict.frozenbidict.viewitems>`
+  would cause a ``TypeError``.
+  Thanks Richard Sanger for
+  `reporting <https://github.com/jab/bidict/issues/48>`_.
 
 
 0.14.0 (2017-11-20)

bidict/_frozen.py

@@ -326,6 +326,6 @@ class frozenbidict(BidirectionalMapping):  # noqa: N801
         values.__doc__ = "Like dict's ``values``."
 
         # Use ItemsView here rather than proxying to fwdm.viewitems() so that
-        # OrderedBidictBase (whose fwdm's values are nodes, not bare values)
+        # ordered bidicts (whose fwdm's values are nodes, not bare values)
         # can use it.
-        viewitems = ItemsView
+        viewitems = lambda self: ItemsView(self)

tests/test_bidict.txt

@@ -211,3 +211,13 @@ inserting existing items is a no-op (i.e. it doesn't raise)::
     True
     >>> sorted(b.items(), key=lambda x: x[1])
     [('one', 1), ('two', 2), ('three', 3)]
+
+Python 2 dict view APIs are supported::
+
+    >>> from bidict.compat import PY2
+    >>> sorted(b.viewkeys()) == sorted(b.keys()) if PY2 else True
+    True
+    >>> sorted(b.viewvalues()) == sorted(b.values()) if PY2 else True
+    True
+    >>> sorted(b.viewitems()) == sorted(b.items()) if PY2 else True
+    True