test and fix for array(dtype=None); resolves #80

Author: alimanfoo

zarr/creation.py

@@ -289,12 +289,20 @@ def array(data, **kwargs):
         data = np.asanyarray(data)
 
     # setup dtype
-    kwargs.setdefault('dtype', data.dtype)
+    kw_dtype = kwargs.get('dtype', None)
+    if kw_dtype is None:
+        kwargs['dtype'] = data.dtype
+    else:
+        kwargs['dtype'] = kw_dtype
 
     # setup shape and chunks
-    shape, chunks = _get_shape_chunks(data)
-    kwargs['shape'] = data.shape
-    kwargs.setdefault('chunks', chunks)
+    data_shape, data_chunks = _get_shape_chunks(data)
+    kwargs['shape'] = data_shape
+    kw_chunks = kwargs.get('chunks', None)
+    if kw_chunks is None:
+        kwargs['chunks'] = data_chunks
+    else:
+        kwargs['chunks'] = kw_chunks
 
     # instantiate array
     z = create(**kwargs)

zarr/tests/test_creation.py

@@ -91,6 +91,12 @@ def test_array():
     eq(c.shape, z5.shape)
     assert_is_instance(z5.chunks, tuple)
 
+    # with dtype=None
+    a = np.arange(100, dtype='i4')
+    z = array(a, dtype=None)
+    assert_array_equal(a[:], z[:])
+    eq(a.dtype, z.dtype)
+
 
 def test_empty():
     z = empty(100, chunks=10)