Changed lookup logic for make_attrgetter to support integers like the regular syntax

2 files changed, 14 insertions, 2 deletions

diff --git a/jinja2/filters.py b/jinja2/filters.py
index 2f6ffd0..49e82aa 100644
--- a/jinja2/filters.py
+++ b/jinja2/filters.py
@@ -54,13 +54,17 @@ def environmentfilter(f):
 def make_attrgetter(environment, attribute):
     """Returns a callable that looks up the given attribute from a
     passed object with the rules of the environment.  Dots are allowed
-    to access attributes of attributes.
+    to access attributes of attributes.  Integer parts in paths are
+    looked up as integers.
     """
-    if not isinstance(attribute, string_types) or '.' not in attribute:
+    if not isinstance(attribute, string_types) \
+       or ('.' not in attribute and not attribute.isdigit()):
         return lambda x: environment.getitem(x, attribute)
     attribute = attribute.split('.')
     def attrgetter(item):
         for part in attribute:
+            if part.isdigit():
+                part = int(part)
             item = environment.getitem(item, part)
         return item
     return attrgetter
diff --git a/jinja2/testsuite/filters.py b/jinja2/testsuite/filters.py
index 8a6ff71..5219f76 100644
--- a/jinja2/testsuite/filters.py
+++ b/jinja2/testsuite/filters.py
@@ -256,6 +256,14 @@ class FilterTestCase(JinjaTestCase):
             {'real': {'value': 18}},
         ]) == '42'
 
+    def test_sum_attributes_tuple(self):
+        tmpl = env.from_string('''{{ values.items()|sum('1') }}''')
+        assert tmpl.render(values={
+            'foo': 23,
+            'bar': 1,
+            'baz': 18,
+        }) == '42'
+
     def test_abs(self):
         tmpl = env.from_string('''{{ -1|abs }}|{{ 1|abs }}''')
         assert tmpl.render() == '1|1', tmpl.render()