Sort imports with isort.

This is the result of:

    $ isort --recursive examples templates transformers utils hubconf.py setup.py

templates/adding_a_new_model/tests/modeling_tf_xxx_test.py

@@ -12,19 +12,18 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
-from __future__ import absolute_import
-from __future__ import division
-from __future__ import print_function
+from __future__ import absolute_import, division, print_function
 
-import unittest
 import sys
-
-from .modeling_tf_common_test import TFCommonTestCases, ids_tensor
-from .configuration_common_test import ConfigTester
-from .utils import CACHE_DIR, require_tf, slow
+import unittest
 
 from transformers import XxxConfig, is_tf_available
 
+from .configuration_common_test import ConfigTester
+from .modeling_tf_common_test import TFCommonTestCases, ids_tensor
+from .utils import CACHE_DIR, require_tf, slow
+
+
 if is_tf_available():
     import tensorflow as tf
     from transformers.modeling_tf_xxx import (

templates/adding_a_new_model/tests/modeling_xxx_test.py

@@ -12,18 +12,17 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
-from __future__ import absolute_import
-from __future__ import division
-from __future__ import print_function
+from __future__ import absolute_import, division, print_function
 
 import unittest
 
 from transformers import is_torch_available
 
-from .modeling_common_test import CommonTestCases, ids_tensor
 from .configuration_common_test import ConfigTester
+from .modeling_common_test import CommonTestCases, ids_tensor
 from .utils import CACHE_DIR, require_torch, slow, torch_device
 
+
 if is_torch_available():
     from transformers import (
         XxxConfig,

templates/adding_a_new_model/tests/tokenization_xxx_test.py

@@ -18,7 +18,7 @@ import os
 import unittest
 from io import open
 
-from transformers.tokenization_bert import XxxTokenizer, VOCAB_FILES_NAMES
+from transformers.tokenization_bert import VOCAB_FILES_NAMES, XxxTokenizer
 
 from .tokenization_tests_commons import CommonTestCases