Zarr append

src/hdmf/data_utils.py

@@ -5,17 +5,20 @@
 from warnings import warn
 from typing import Tuple
 from itertools import product, chain
+from zarr import Array as ZarrArray
 
 import h5py
 import numpy as np
 
 from .utils import docval, getargs, popargs, docval_macro, get_data_shape
 
-
 def append_data(data, arg):
     if isinstance(data, (list, DataIO)):
         data.append(arg)
         return data
+    elif isinstance(data, ZarrArray):
+        data.append([arg], axis=0)
+        return data
     elif type(data).__name__ == 'TermSetWrapper': # circular import
         data.append(arg)
         return data

tests/unit/utils_test/test_data_utils.py

@@ -0,0 +1,14 @@
+from hdmf.data_utils import append_data
+from hdmf.testing import TestCase
+
+import numpy as np
+from numpy.testing import assert_array_equal
+import zarr
+
+class TestAppendData(TestCase):
+
+    def test_append_data_zarr(self):
+        zarr_array = zarr.array([1,2,3])
+        new = append_data(zarr_array, 4)
+
+        assert_array_equal(new[:], np.array([1,2,3,4]))