Merge pull request #82 from zopefoundation/issue81

 Remove unneeded _compat._b/_u/_native.

CHANGES.rst

@@ -7,7 +7,8 @@
 - Reach and maintain 100% test coverage.
 
 - Simplify ``__init__.py``, including removal of an attempted legacy
-  import of ``persistent.TimeStamp``.
+  import of ``persistent.TimeStamp``. See `PR 80
+  <https://github.com/zopefoundation/persistent/pull/80>`_.
 
 - Add support for Python 3.7 and drop support for Python 3.3.
 
@@ -27,6 +28,8 @@
 - Fix deleting special (``_p``) attributes of a pure-Python persistent
   object that overrides ``__delattr__`` and correctly calls ``_p_delattr``.
 
+- Remove some internal compatibility shims that are no longer
+  necessary. See `PR 82 <https://github.com/zopefoundation/persistent/pull/82>`_.
 
 4.3.0 (2018-07-30)
 ------------------

persistent/_compat.py

@@ -17,25 +17,12 @@
 
 PURE_PYTHON = os.environ.get('PURE_PYTHON')
 
-if sys.version_info[0] > 2: # pragma: no cover
+if sys.version_info[0] > 2:
     import copyreg as copy_reg
     from collections import UserDict as IterableUserDict
     from collections import UserList
     from sys import intern
 
-    def _u(s):
-        return s
-
-    def _b(s):
-        if isinstance(s, str):
-            return s.encode('unicode_escape')
-        return s
-
-    def _native(s):
-        if isinstance(s, bytes):
-            return s.decode('unicode_escape')
-        return s
-
     PYTHON3 = True
     PYTHON2 = False
 
@@ -44,16 +31,6 @@ def _native(s):
     from UserDict import IterableUserDict
     from UserList import UserList
 
-    def _u(s):
-        return unicode(s, 'unicode_escape')
-
-    def _native(s):
-        if isinstance(s, unicode):
-            return s.encode('unicode_escape')
-        return s
-
-    _b = _native
-
     PYTHON3 = False
     PYTHON2 = True
 

persistent/tests/test_persistence.py

@@ -1735,7 +1735,6 @@ def test_accessed_with_jar_and_oid_but_not_in_cache(self):
         # but because they are newly created, they aren't in the
         # pickle cache yet.
         # Nothing should blow up when this happens
-        from persistent._compat import _b
         KEY = b'123'
         jar = self._makeJar()
         c1 = self._makeOne()
@@ -1753,8 +1752,7 @@ def mru(oid):
 
     def test_accessed_invalidated_with_jar_and_oid_but_no_cache(self):
         # This scenario arises in ZODB tests where the jar is faked
-        from persistent._compat import _b
-        KEY = _b('123')
+        KEY = b'123'
         class Jar(object):
             accessed = False
             def __getattr__(self, name):