diff --git a/tfields/core.py b/tfields/core.py
index 6db66321291425cd50710fa26ef567def39a9675..f3fadf7b6960ef93ec7f2dc659178784dbbefe0e 100644
--- a/tfields/core.py
+++ b/tfields/core.py
@@ -10,7 +10,7 @@ contains numpy ndarray derived bases of the tfields package
 Notes:
     * It could be worthwhile concidering `np.li.mixins.NDArrayOperatorsMixin ...
     <https://docs.scipy.org/doc/numpy-1.15.1/reference/generated/...
-    ... numpy.lib.mixins.NDArrayOperatorsMixin.html>`_
+    ... numpy.lib.mixins.NDArrayOperatorsMixin.html>`
 """
 # builtin
 import warnings
@@ -305,9 +305,9 @@ class AbstractObject(object):  # pylint: disable=useless-object-inheritance
                     bulk_type = bulk_type.decode("UTF-8")
                 bulk_type = getattr(tfields, bulk_type)
                 list_dict[key].append(
-                    bulk_type._from_dict_legacy(
+                    bulk_type._from_dict_legacy(  # noqa: E501 pylint: disable=protected-access
                         **sub_dict[index]
-                    )  # noqa: E501 pylint: disable=protected-access
+                    )
                 )
 
         with cls._bypass_setters(  # pylint: disable=protected-access,no-member
@@ -1049,15 +1049,13 @@ class Tensors(AbstractNdarray):  # pylint: disable=too-many-public-methods
             >>> assert t_cyl[0, 0] == 3
 
         """
-        #         scalars                 empty             already there
-        if (
-            self.rank == 0
-            or self.shape[0] == 0
-            or self.coord_sys
-            == coord_sys  # noqa: E501 pylint: disable=access-member-before-definition
-        ):
+        if self.rank == 0 or self.shape[0] == 0:
+            # scalar or empty
             self.coord_sys = coord_sys  # pylint: disable=attribute-defined-outside-init
             return
+        if self.coord_sys == coord_sys:
+            # already correct
+            return
 
         tfields.bases.transform(self, self.coord_sys, coord_sys)
         # self[:] = tfields.bases.transform(self, self.coord_sys, coord_sys)