Try @cgohlke fix for issue #163

Author: kwgoodman

bottleneck/src/reduce_template.c

@@ -129,7 +129,7 @@ REDUCE_ALL(nansum, DTYPE0)
         NEXT
     }
     BN_END_ALLOW_THREADS
-    return PyInt_FromLong(asum);
+    return PyLong_FromLongLong(asum);
 }
 
 REDUCE_ONE(nansum, DTYPE0)

bottleneck/tests/util.py

@@ -109,6 +109,7 @@ def array_generator(func_name, dtypes):
     yield np.array([1, 2, 3]) + 1e9  # check that move_std is robust
     yield np.array([0, 0, 0])  # nanargmax/nanargmin
     yield np.array([1, nan, nan, 2])  # nanmedian
+    yield np.array([2**31], dtype=np.int64)  # nansum on windows
 
     # ties
     yield np.array([0, 0, 0])