fixed pep8 issues

xarray/backends/zarr.py

@@ -332,7 +332,7 @@ def sync(self):
 def open_zarr(store, group=None, synchronizer=None, chunks='auto',
               decode_cf=True, mask_and_scale=True, decode_times=True,
               concat_characters=True, decode_coords=True,
-              drop_variables=None, overwrite_encoded_chunks=False, 
+              drop_variables=None, overwrite_encoded_chunks=False,
               **kwargs):
     """Load and decode a dataset from a Zarr store.
 
@@ -403,9 +403,9 @@ def open_zarr(store, group=None, synchronizer=None, chunks='auto',
     """
     if 'auto_chunk' in kwargs:
         auto_chunk = kwargs.pop('auto_chunk')
-        if auto_chunk == True:
+        if auto_chunk:
             chunks = 'auto'  # maintain backwards compatibility
-        elif auto_chunk == False:
+        else:
             chunks = None
 
         warnings.warn("auto_chunk is deprecated. Use chunks='auto' instead.",

xarray/tests/test_backends.py

@@ -1380,27 +1380,27 @@ def test_manual_chunk(self):
 
                 assert_identical(actual, auto)
                 assert_identical(actual.load(), auto.load())
-    
+
     def test_deprecate_auto_chunk(self):
         original = create_test_data().chunk()
         with pytest.warns(FutureWarning):
             with self.roundtrip(
-                original, open_kwargs={'auto_chunk': True}) as actual:
+                    original, open_kwargs={'auto_chunk': True}) as actual:
                 for k, v in actual.variables.items():
                     # only index variables should be in memory
                     assert v._in_memory == (k in actual.dims)
                     # chunk size should be the same as original
                     assert v.chunks == original[k].chunks
-        
+
         with pytest.warns(FutureWarning):
             with self.roundtrip(
-                original, open_kwargs={'auto_chunk': False}) as actual:
+                    original, open_kwargs={'auto_chunk': False}) as actual:
                 for k, v in actual.variables.items():
                     # only index variables should be in memory
                     assert v._in_memory == (k in actual.dims)
                     # there should be no chunks
                     assert v.chunks is None
-            
+
 
     def test_write_uneven_dask_chunks(self):
         # regression for GH#2225