Merge pull request numpy#2940 from ContinuumIO/ndindex_fix_more

BUG: Fix logic in ndindex to match __init__ method.   Fixes bug in ndindex((3,))

numpy/lib/index_tricks.py

@@ -535,7 +535,9 @@ class ndindex(object):
     # Fixing nditer would be more work but should be done eventually,
     #  and then this entire __new__ method can be removed.
     def __new__(cls, *shape):
-        if len(shape) == 0 or (len(shape) == 1 and len(shape[0]) == 0):
+        if len(shape) == 1 and isinstance(shape[0], tuple):
+           shape = shape[0]
+        if len(shape) == 0:
             class zero_dim_iter(object):
                 def __init__(self):
                     self._N = 1

numpy/lib/tests/test_index_tricks.py

@@ -245,6 +245,10 @@ def test_ndindex():
     x = list(np.ndindex((1, 2, 3)))
     assert_array_equal(x, expected)
 
+    # Test use of scalars and tuples
+    x = list(np.ndindex((3,)))
+    assert_array_equal(x, list(np.ndindex(3)))
+
     # Make sure size argument is optional
     x = list(np.ndindex())
     assert_equal(x, [()])