Fix more failing tests

Author: tobiasdiez

src/sage/interfaces/r.py

@@ -264,19 +264,24 @@
 #                  https://www.gnu.org/licenses/
 #
 # ************************************************************************
-import os
 import logging
+import os
+import re
 
-from .interface import Interface, InterfaceElement, InterfaceFunction, InterfaceFunctionElement
 from sage.env import DOT_SAGE
-import re
-from sage.structure.element import parent
+from sage.features import PythonModule
+from sage.interfaces.interface import (
+    Interface,
+    InterfaceElement,
+    InterfaceFunction,
+    InterfaceFunctionElement,
+)
 from sage.interfaces.tab_completion import ExtraTabCompletion
 from sage.misc.instancedoc import instancedoc
 
 # see the _lazy_init for some reasoning behind the lazy imports
 from sage.misc.lazy_import import lazy_import
-from sage.features import PythonModule
+from sage.structure.element import parent
 
 rpy2_feature = PythonModule('rpy2', spkg='rpy2', type='standard')
 
@@ -371,7 +376,7 @@ def _setup_r_to_sage_converter():
         sage: labs = r.paste('c("X","Y")', '1:10', sep='""'); labs.sage()
         ['X1', 'Y2', 'X3', 'Y4', 'X5', 'Y6', 'X7', 'Y8', 'X9', 'Y10']
     """
-    from rpy2.rinterface import SexpVector, ListSexpVector, FloatSexpVector
+    from rpy2.rinterface import FloatSexpVector, ListSexpVector, SexpVector
 
     # convert rpy2's representation of r objects to the one sage expects (as defined by the old
     # expect interface)
@@ -484,6 +489,7 @@ def __init__(self,
 
         TESTS::
 
+            sage: from sage.interfaces.r import r
             sage: r == loads(dumps(r))
             True
         """