FIX: #611 namedtuple breaks to_object_array_tuples

Author: adamklein

pandas/src/inference.pyx

@@ -448,7 +448,7 @@ def to_object_array_tuples(list rows):
     result = np.empty((n, k), dtype=object)
 
     for i from 0 <= i < n:
-        row = rows[i]
+        row = tuple(rows[i]) # upcast any subclasses to tuple
 
         for j from 0 <= j < len(row):
             result[i, j] = row[j]

pandas/tests/test_tseries.py

@@ -275,6 +275,17 @@ def test_unicode(self):
     def test_datetime(self):
         pass
 
+    def test_to_object_array_tuples(self):
+        r = (5,6)
+        values = [r]
+        result = lib.to_object_array_tuples(values)
+
+        # make sure record array works
+        import collections as col
+        record = col.namedtuple('record', 'x y')
+        r = record(5,6)
+        values = [r]
+        result = lib.to_object_array_tuples(values)
 
 class TestMoments(unittest.TestCase):
     pass