Remove version tests for < 2.6.

2.6 is unsupported. 2.6 is long unsupported.

Consistently spell the version checks that remain as PY2 or PY3 to make
them slightly easier to find.

src/ZODB/FileStorage/format.py

@@ -85,11 +85,10 @@
 
 import logging
 import struct
-import sys
 
 from ZODB.POSException import POSKeyError
 from ZODB.utils import u64, oid_repr, as_bytes
-
+from ZODB._compat import PY3
 
 class CorruptedError(Exception):
     pass
@@ -262,7 +261,7 @@ class DataHeader(object):
 
 def TxnHeaderFromString(s):
     res = TxnHeader(*struct.unpack(TRANS_HDR, s))
-    if sys.version_info[0] >= 3:
+    if PY3:
         res.status = res.status.decode('ascii')
     return res
 

src/ZODB/POSException.py

@@ -15,8 +15,6 @@
 
 $Id$"""
 
-import sys
-
 from ZODB.utils import oid_repr, readable_tid_repr
 
 # BBB: We moved the two transactions to the transaction package
@@ -37,26 +35,9 @@ _recon.__no_side_effects__ = True
 class POSError(Exception):
     """Persistent object system error."""
 
-    if sys.version_info[:2] == (2, 6):
-        # The 'message' attribute was deprecated for BaseException with
-        # Python 2.6; here we create descriptor properties to continue using it
-        def __set_message(self, v):
-            self.__dict__['message'] = v
-
-        def __get_message(self):
-            return self.__dict__['message']
-
-        def __del_message(self):
-            del self.__dict__['message']
-
-        message = property(__get_message, __set_message, __del_message)
-
-    if sys.version_info[:2] >= (2, 5):
     def __reduce__(self):
         # Copy extra data from internal structures
         state = self.__dict__.copy()
-            if sys.version_info[:2] == (2, 5):
-                state['message'] = self.message
         state['args'] = self.args
 
         return (_recon, (self.__class__, state))

src/ZODB/_compat.py

@@ -82,7 +82,7 @@ def PersistentPickler(persistent_id, *args, **kwargs):
     This covers the differences between Python 2 and 3 and PyPy/zodbpickle.
     """
     p = Pickler(*args, **kwargs)
-    if sys.version_info[0] < 3:
+    if not PY3:
         p.inst_persistent_id = persistent_id
 
     # PyPy uses a python implementation of cPickle/zodbpickle in both Python 2

src/ZODB/blob.py

@@ -36,9 +36,10 @@ from ZODB._compat import PersistentUnpickler
 from ZODB._compat import decodebytes
 from ZODB._compat import ascii_bytes
 from ZODB._compat import INT_TYPES
+from ZODB._compat import PY3
 
 
-if sys.version_info[0] >= 3:
+if PY3:
     from io import FileIO as file
 
 

src/ZODB/tests/IteratorStorage.py

@@ -24,7 +24,6 @@ from ZODB.utils import U64, p64, load_current
 
 from transaction import Transaction
 
-import sys
 import ZODB.blob
 
 try:
@@ -159,10 +158,8 @@ class IteratorStorage(IteratorCompare):
         # We store another transaction with 1 object, the already running
         # iterator does not pick this up.
         self._dostore()
-        if sys.version_info[0] < 3:
-            self.assertRaises(StopIteration, iterator.next)
-        else:
-            self.assertRaises(StopIteration, iterator.__next__)
+        with self.assertRaises(StopIteration):
+            next(iterator)
 
 
 class ExtendedIteratorStorage(IteratorCompare):

src/ZODB/tests/testCache.py

@@ -33,7 +33,6 @@ import ZODB
 import ZODB.MappingStorage
 import ZODB.tests.util
 
-PY2 = sys.version_info[0] == 2
 
 class CacheTestBase(ZODB.tests.util.TestCase):
 

src/ZODB/tests/testDB.py

@@ -227,8 +227,7 @@ def open_convenience():
 
     """
 
-if sys.version_info >= (2, 6):
-    def db_with_transaction():
+def db_with_transaction():
     """Using databases with with
 
     The transaction method returns a context manager that when entered
@@ -248,7 +247,7 @@ if sys.version_info >= (2, 6):
 
     >>> conn2.opened
 
-    Now, we'll open a 3rd connection a verify that
+Now, we'll open a 3rd connection a verify that
 
     >>> conn3 = db.open()
     >>> conn3.root()['x']
@@ -257,7 +256,7 @@ if sys.version_info >= (2, 6):
     1
     >>> conn3.close()
 
-    Let's try again, but this time, we'll have an exception:
+Let's try again, but this time, we'll have an exception:
 
     >>> with db.transaction() as conn2:
     ...     conn2.root()['y'] = 2

src/ZODB/tests/testPersistentList.py

@@ -13,11 +13,11 @@
 ##############################################################################
 """Test the list interface to PersistentList
 """
-import sys
+
 import unittest
 from persistent.list import PersistentList
 
-PY2 = sys.version_info[0] == 2
+from six import PY2
 
 l0 = []
 l1 = [0]
@@ -84,7 +84,7 @@ class TestPList(unittest.TestCase):
         except IndexError:
             pass
         else:
-            raise TestFailed("uu2[2] shouldn't be assignable")
+            self.fail("uu2[2] shouldn't be assignable")
 
         # Test __delitem__
 
@@ -95,7 +95,7 @@ class TestPList(unittest.TestCase):
         except IndexError:
             pass
         else:
-            raise TestFailed("uu2[0] shouldn't be deletable")
+            self.fail("uu2[0] shouldn't be deletable")
 
         # Test __getslice__
 
@@ -191,7 +191,7 @@ class TestPList(unittest.TestCase):
         except ValueError:
             pass
         else:
-            raise TestFailed("expected ValueError")
+            self.fail("expected ValueError")
 
         # Test reverse
 

src/ZODB/tests/testPersistentMapping.py

@@ -23,20 +23,12 @@ old code, developers will have a hard time testing the new code.
 import unittest
 import sys
 
-import transaction
 from transaction import Transaction
 
 import ZODB
 from ZODB.MappingStorage import MappingStorage
-from ZODB._compat import Unpickler
 
-try:
-    import cStringIO
-except ImportError:
-    # Py3
-    import io as cStringIO
-
-PY2 = sys.version_info[0] == 2
+from six import PY2
 
 # This pickle contains a persistent mapping pickle created from the
 # old code.
@@ -68,35 +60,6 @@ class PMTests(unittest.TestCase):
         self.assertTrue(hasattr(r, 'data'))
         self.assertTrue(not hasattr(r, '_container'))
 
-    # TODO:  This test fails in ZODB 3.3a1.  It's making some assumption(s)
-    # about pickles that aren't true.  Hard to say when it stopped working,
-    # because this entire test suite hasn't been run for a long time, due to
-    # a mysterious "return None" at the start of the test_suite() function
-    # below.  I noticed that when the new checkBackwardCompat() test wasn't
-    # getting run.
-    def TODO_checkNewPicklesAreSafe(self):
-        s = MappingStorage()
-        db = ZODB.DB(s)
-        r = db.open().root()
-        r[1] = 1
-        r[2] = 2
-        r[3] = r
-        transaction.commit()
-        # MappingStorage stores serialno + pickle in its _index.
-        root_pickle = s._index['\000' * 8][8:]
-
-        # XXX not BytesIO really?
-        f = cStringIO.StringIO(root_pickle)
-        u = Unpickler(f)
-        klass_info = u.load()
-        klass = find_global(*klass_info[0])
-        inst = klass.__new__(klass)
-        state = u.load()
-        inst.__setstate__(state)
-
-        self.assertTrue(hasattr(inst, '_container'))
-        self.assertTrue(not hasattr(inst, 'data'))
-
     def checkBackwardCompat(self):
         # Verify that the sanest of the ZODB 3.2 dotted paths still works.
         from persistent.mapping import PersistentMapping as newPath

src/ZODB/tests/util.py

@@ -19,7 +19,6 @@ import atexit
 import os
 import persistent
 import re
-import sys
 import tempfile
 import time
 import transaction
@@ -136,9 +135,6 @@ class AAAA_Test_Runner_Hack(unittest.TestCase):
         pass
 
 def assert_warning(category, func, warning_text=''):
-    if sys.version_info < (2, 6):
-        return func() # Can't use catch_warnings :(
-
     with warnings.catch_warnings(record=True) as w:
         warnings.simplefilter('default')
         result = func()
@@ -154,7 +150,7 @@ def assert_deprecated(func, warning_text=''):
 def wait(func=None, timeout=30):
     if func is None:
         return lambda f: wait(f, timeout)
-    for i in range(int(timeout*100)):
+    for _ in range(int(timeout*100)):
         if func():
             return
         time.sleep(.01)

src/ZODB/utils.py

@@ -28,6 +28,8 @@ from ZODB._compat import Unpickler
 from ZODB._compat import BytesIO
 from ZODB._compat import ascii_bytes
 
+from six import PY2
+
 __all__ = ['z64',
            'p64',
            'u64',
@@ -71,7 +73,7 @@ def deprecated38(msg):
                   DeprecationWarning, stacklevel=3)
 
 
-if sys.version_info[0] < 3:
+if PY2:
     def as_bytes(obj):
         "Convert obj into bytes"
         return str(obj)