--- src/zodbpickle/pickle_2.py.orig	2021-09-29 06:13:32 UTC
+++ src/zodbpickle/pickle_2.py
@@ -27,8 +27,8 @@ Misc variables:
 __version__ = "$Revision: 72223 $"       # Code version
 
 from types import *
-from copy_reg import dispatch_table
-from copy_reg import _extension_registry, _inverted_registry, _extension_cache
+from copyreg import dispatch_table
+from copyreg import _extension_registry, _inverted_registry, _extension_cache
 import marshal
 import sys
 import struct
@@ -513,22 +513,22 @@ class Pickler:
     if StringType is UnicodeType:
         # This is true for Jython
         def save_string(self, obj, pack=struct.pack):
-            unicode = obj.isunicode()
+            str = obj.isunicode()
 
             if self.bin:
-                if unicode:
+                if str:
                     obj = obj.encode("utf-8")
                 l = len(obj)
-                if l < 256 and not unicode:
+                if l < 256 and not str:
                     self.write(SHORT_BINSTRING + chr(l) + obj)
                 else:
                     s = pack("<i", l)
-                    if unicode:
+                    if str:
                         self.write(BINUNICODE + s + obj)
                     else:
                         self.write(BINSTRING + s + obj)
             else:
-                if unicode:
+                if str:
                     obj = obj.replace("\\", "\\u005c")
                     obj = obj.replace("\n", "\\u000a")
                     obj = obj.encode('raw-unicode-escape')
@@ -625,12 +625,12 @@ class Pickler:
                 write(APPEND)
             return
 
-        r = xrange(self._BATCHSIZE)
+        r = range(self._BATCHSIZE)
         while items is not None:
             tmp = []
             for i in r:
                 try:
-                    x = items.next()
+                    x = next(items)
                     tmp.append(x)
                 except StopIteration:
                     items = None
@@ -655,7 +655,7 @@ class Pickler:
             write(MARK + DICT)
 
         self.memoize(obj)
-        self._batch_setitems(obj.iteritems())
+        self._batch_setitems(iter(obj.items()))
 
     dispatch[DictionaryType] = save_dict
     if not PyStringMap is None:
@@ -673,12 +673,12 @@ class Pickler:
                 write(SETITEM)
             return
 
-        r = xrange(self._BATCHSIZE)
+        r = range(self._BATCHSIZE)
         while items is not None:
             tmp = []
             for i in r:
                 try:
-                    tmp.append(items.next())
+                    tmp.append(next(items))
                 except StopIteration:
                     items = None
                     break
@@ -834,7 +834,7 @@ def whichmodule(func, funcname):
     if func in classmap:
         return classmap[func]
 
-    for name, module in sys.modules.items():
+    for name, module in list(sys.modules.items()):
         if module is None:
             continue # skip dummy package entries
         if name != '__main__' and getattr(module, funcname, None) is func:
@@ -879,7 +879,7 @@ class Unpickler:
             while 1:
                 key = read(1)
                 dispatch[key](self)
-        except _Stop, stopinst:
+        except _Stop as stopinst:
             return stopinst.value
 
     def noload(self):
@@ -898,7 +898,7 @@ class Unpickler:
             while 1:
                 key = read(1)
                 dispatch[key](self)
-        except _Stop, stopinst:
+        except _Stop as stopinst:
             return stopinst.value
 
     # Return largest index k such that self.stack[k] is self.mark.
@@ -925,7 +925,7 @@ class Unpickler:
     def load_proto(self):
         proto = ord(self.read(1))
         if not 0 <= proto <= HIGHEST_PROTOCOL:
-            raise ValueError, "unsupported pickle protocol: %d" % proto
+            raise ValueError("unsupported pickle protocol: %d" % proto)
     dispatch[PROTO] = load_proto
 
     def load_persid(self):
@@ -960,7 +960,7 @@ class Unpickler:
             try:
                 val = int(data)
             except ValueError:
-                val = long(data)
+                val = int(data)
         self.append(val)
     dispatch[INT] = load_int
 
@@ -977,7 +977,7 @@ class Unpickler:
     dispatch[BININT2] = load_binint2
 
     def load_long(self):
-        self.append(long(self.readline()[:-1], 0))
+        self.append(int(self.readline()[:-1], 0))
     dispatch[LONG] = load_long
 
     def load_long1(self):
@@ -1005,11 +1005,11 @@ class Unpickler:
         for q in "\"'": # double or single quote
             if rep.startswith(q):
                 if len(rep) < 2 or not rep.endswith(q):
-                    raise ValueError, "insecure string pickle"
+                    raise ValueError("insecure string pickle")
                 rep = rep[len(q):-len(q)]
                 break
         else:
-            raise ValueError, "insecure string pickle"
+            raise ValueError("insecure string pickle")
         self.append(rep.decode("string-escape"))
     dispatch[STRING] = load_string
 
@@ -1024,12 +1024,12 @@ class Unpickler:
     dispatch[BINBYTES] = load_binbytes
 
     def load_unicode(self):
-        self.append(unicode(self.readline()[:-1],'raw-unicode-escape'))
+        self.append(str(self.readline()[:-1],'raw-unicode-escape'))
     dispatch[UNICODE] = load_unicode
 
     def load_binunicode(self):
         len = mloads('i' + self.read(4))
-        self.append(unicode(self.read(len),'utf-8'))
+        self.append(str(self.read(len),'utf-8'))
     dispatch[BINUNICODE] = load_binunicode
 
     def load_short_binstring(self):
@@ -1110,9 +1110,9 @@ class Unpickler:
         if not instantiated:
             try:
                 value = klass(*args)
-            except TypeError, err:
-                raise TypeError, "in constructor for %s: %s" % (
-                    klass.__name__, str(err)), sys.exc_info()[2]
+            except TypeError as err:
+                raise TypeError("in constructor for %s: %s" % (
+                    klass.__name__, str(err))).with_traceback(sys.exc_info()[2])
         self.append(value)
 
     def load_inst(self):
@@ -1275,8 +1275,8 @@ class Unpickler:
             try:
                 d = inst.__dict__
                 try:
-                    for k, v in state.iteritems():
-                        d[intern(k)] = v
+                    for k, v in state.items():
+                        d[sys.intern(k)] = v
                 # keys in state don't have to be strings
                 # don't blow up, but don't go out of our way
                 except TypeError:
@@ -1292,10 +1292,10 @@ class Unpickler:
                 # .update() business, and always uses
                 #     PyObject_SetItem(inst.__dict__, key, value) in a
                 # loop over state.items().
-                for k, v in state.items():
+                for k, v in list(state.items()):
                     setattr(inst, k, v)
         if slotstate:
-            for k, v in slotstate.items():
+            for k, v in list(slotstate.items()):
                 setattr(inst, k, v)
     dispatch[BUILD] = load_build
 
@@ -1459,7 +1459,7 @@ def encode_long(x):
             # Extend to a full byte.
             nibbles += 1
         nbits = nibbles * 4
-        x += 1L << nbits
+        x += 1 << nbits
         assert x > 0
         ashex = hex(x)
         njunkchars = 2 + ashex.endswith('L')
@@ -1499,19 +1499,19 @@ def decode_long(data):
 
     nbytes = len(data)
     if nbytes == 0:
-        return 0L
+        return 0
     ashex = _binascii.hexlify(data[::-1])
-    n = long(ashex, 16) # quadratic time before Python 2.3; linear now
+    n = int(ashex, 16) # quadratic time before Python 2.3; linear now
     if data[-1] >= '\x80':
-        n -= 1L << (nbytes * 8)
+        n -= 1 << (nbytes * 8)
     return n
 
 # Shorthands
 
 try:
-    from cStringIO import StringIO
+    from io import StringIO
 except ImportError:
-    from StringIO import StringIO
+    from io import StringIO
 
 def dump(obj, file, protocol=None):
     Pickler(file, protocol).dump(obj)
--- src/zodbpickle/pickle_3.py.orig	2021-09-29 06:13:32 UTC
+++ src/zodbpickle/pickle_3.py
@@ -601,7 +601,7 @@ class _Pickler:
             return
 
         items = iter(items)
-        r = range(self._BATCHSIZE)
+        r = list(range(self._BATCHSIZE))
         while items is not None:
             tmp = []
             for i in r:
@@ -631,7 +631,7 @@ class _Pickler:
             write(MARK + DICT)
 
         self.memoize(obj)
-        self._batch_setitems(obj.items())
+        self._batch_setitems(list(obj.items()))
 
     dispatch[dict] = save_dict
     if PyStringMap is not None:
@@ -650,7 +650,7 @@ class _Pickler:
             return
 
         items = iter(items)
-        r = range(self._BATCHSIZE)
+        r = list(range(self._BATCHSIZE))
         while items is not None:
             tmp = []
             for i in r:
@@ -1182,8 +1182,8 @@ class _Unpickler:
         try:
             value = func(*args)
         except:
-            print(sys.exc_info())
-            print(func, args)
+            print((sys.exc_info()))
+            print((func, args))
             raise
         stack[-1] = value
     dispatch[REDUCE[0]] = load_reduce
@@ -1290,13 +1290,13 @@ class _Unpickler:
         if state:
             inst_dict = inst.__dict__
             intern = sys.intern
-            for k, v in state.items():
+            for k, v in list(state.items()):
                 if type(k) is str:
-                    inst_dict[intern(k)] = v
+                    inst_dict[sys.intern(k)] = v
                 else:
                     inst_dict[k] = v
         if slotstate:
-            for k, v in slotstate.items():
+            for k, v in list(slotstate.items()):
                 setattr(inst, k, v)
     dispatch[BUILD[0]] = load_build
 
--- src/zodbpickle/pickletools_2.py.orig	2021-09-29 06:13:32 UTC
+++ src/zodbpickle/pickletools_2.py
@@ -429,7 +429,7 @@ def read_unicodestringnl(f):
         raise ValueError("no newline found when trying to read "
                          "unicodestringnl")
     data = data[:-1]    # lose the newline
-    return unicode(data, 'raw-unicode-escape')
+    return str(data, 'raw-unicode-escape')
 
 unicodestringnl = ArgumentDescriptor(
                       name='unicodestringnl',
@@ -465,7 +465,7 @@ def read_unicodestring4(f):
         raise ValueError("unicodestring4 byte count < 0: %d" % n)
     data = f.read(n)
     if len(data) == n:
-        return unicode(data, 'utf-8')
+        return str(data, 'utf-8')
     raise ValueError("expected %d bytes in a unicodestring4, but only %d "
                      "remain" % (n, len(data)))
 
@@ -509,7 +509,7 @@ def read_decimalnl_short(f):
     try:
         return int(s)
     except OverflowError:
-        return long(s)
+        return int(s)
 
 def read_decimalnl_long(f):
     r"""
@@ -532,7 +532,7 @@ def read_decimalnl_long(f):
     s = read_stringnl(f, decode=False, stripquotes=False)
     if not s.endswith("L"):
         raise ValueError("trailing 'L' required in %r" % s)
-    return long(s)
+    return int(s)
 
 
 decimalnl_short = ArgumentDescriptor(
@@ -731,12 +731,12 @@ pyint = StackObject(
 
 pylong = StackObject(
              name='long',
-             obtype=long,
+             obtype=int,
              doc="A long (as opposed to short) Python integer object.")
 
 pyinteger_or_bool = StackObject(
                         name='int_or_bool',
-                        obtype=(int, long, bool),
+                        obtype=(int, int, bool),
                         doc="A Python integer object (short or long), or "
                             "a Python bool.")
 
@@ -757,7 +757,7 @@ pystring = StackObject(
 
 pyunicode = StackObject(
                 name='unicode',
-                obtype=unicode,
+                obtype=str,
                 doc="A Python Unicode string object.")
 
 pynone = StackObject(
@@ -1800,18 +1800,18 @@ def assure_pickle_consistency(verbose=False):
     for name in pickle.__all__:
         if not re.match("[A-Z][A-Z0-9_]+$", name):
             if verbose:
-                print "skipping %r: it doesn't look like an opcode name" % name
+                print("skipping %r: it doesn't look like an opcode name" % name)
             continue
         picklecode = getattr(pickle, name)
         if not isinstance(picklecode, str) or len(picklecode) != 1:
             if verbose:
-                print ("skipping %r: value %r doesn't look like a pickle "
-                       "code" % (name, picklecode))
+                print(("skipping %r: value %r doesn't look like a pickle "
+                       "code" % (name, picklecode)))
             continue
         if picklecode in copy:
             if verbose:
-                print "checking name %r w/ code %r for consistency" % (
-                      name, picklecode)
+                print("checking name %r w/ code %r for consistency" % (
+                      name, picklecode))
             d = copy[picklecode]
             if d.name != name:
                 raise ValueError("for pickle code %r, pickle.py uses name %r "
@@ -1827,7 +1827,7 @@ def assure_pickle_consistency(verbose=False):
                              (name, picklecode))
     if copy:
         msg = ["we appear to have pickle opcodes that pickle.py doesn't have:"]
-        for code, d in copy.items():
+        for code, d in list(copy.items()):
             msg.append("    name %r with code %r" % (d.name, code))
         raise ValueError("\n".join(msg))
 
@@ -1861,7 +1861,7 @@ def genops(pickle):
     to query its current position) pos is None.
     """
 
-    import cStringIO as StringIO
+    import io as StringIO
 
     if isinstance(pickle, str):
         pickle = StringIO.StringIO(pickle)
@@ -1969,7 +1969,7 @@ def dis(pickle, out=None, memo=None, indentlevel=4):
     errormsg = None
     for opcode, arg, pos in genops(pickle):
         if pos is not None:
-            print >> out, "%5d:" % pos,
+            print("%5d:" % pos, end=' ', file=out)
 
         line = "%-4s %s%s" % (repr(opcode.code)[1:-1],
                               indentchunk * len(markstack),
@@ -2034,7 +2034,7 @@ def dis(pickle, out=None, memo=None, indentlevel=4):
                 line += ' ' + repr(arg)
             if markmsg:
                 line += ' ' + markmsg
-        print >> out, line
+        print(line, file=out)
 
         if errormsg:
             # Note that we delayed complaining until the offending opcode
@@ -2053,7 +2053,7 @@ def dis(pickle, out=None, memo=None, indentlevel=4):
 
         stack.extend(after)
 
-    print >> out, "highest protocol among opcodes =", maxproto
+    print("highest protocol among opcodes =", maxproto, file=out)
     if stack:
         raise ValueError("stack not empty after STOP: %r" % stack)
 
--- src/zodbpickle/tests/pickletester_2.py.orig	2021-09-29 06:13:32 UTC
+++ src/zodbpickle/tests/pickletester_2.py
@@ -1,8 +1,8 @@
 import io
 import unittest
-import StringIO
-import cStringIO
-import copy_reg
+import io
+import io
+import copyreg
 import sys
 
 try:
@@ -45,7 +45,7 @@ from zodbpickle import pickletools_2 as pickletools
 #     for proto in protocols:
 # kind of outer loop.
 assert pickle.HIGHEST_PROTOCOL == cPickle.HIGHEST_PROTOCOL == 3
-protocols = range(pickle.HIGHEST_PROTOCOL + 1)
+protocols = list(range(pickle.HIGHEST_PROTOCOL + 1))
 
 # Copy of test.test_support.run_with_locale. This is needed to support Python
 # 2.4, which didn't include it. This is all to support test_xpickle, which
@@ -78,7 +78,7 @@ def run_with_locale(catstr, *locales):
             finally:
                 if locale and orig_locale:
                     locale.setlocale(category, orig_locale)
-        inner.func_name = func.func_name
+        inner.__name__ = func.__name__
         inner.__doc__ = func.__doc__
         return inner
     return decorator
@@ -114,21 +114,21 @@ class ExtensionSaver:
     # there is one).
     def __init__(self, code):
         self.code = code
-        if code in copy_reg._inverted_registry:
-            self.pair = copy_reg._inverted_registry[code]
-            copy_reg.remove_extension(self.pair[0], self.pair[1], code)
+        if code in copyreg._inverted_registry:
+            self.pair = copyreg._inverted_registry[code]
+            copyreg.remove_extension(self.pair[0], self.pair[1], code)
         else:
             self.pair = None
 
     # Restore previous registration for code.
     def restore(self):
         code = self.code
-        curpair = copy_reg._inverted_registry.get(code)
+        curpair = copyreg._inverted_registry.get(code)
         if curpair is not None:
-            copy_reg.remove_extension(curpair[0], curpair[1], code)
+            copyreg.remove_extension(curpair[0], curpair[1], code)
         pair = self.pair
         if pair is not None:
-            copy_reg.add_extension(pair[0], pair[1], code)
+            copyreg.add_extension(pair[0], pair[1], code)
 
 class C:
     def __cmp__(self, other):
@@ -154,8 +154,8 @@ class initarg(C):
 class metaclass(type):
     pass
 
-class use_metaclass(object):
-    __metaclass__ = metaclass
+class use_metaclass(object, metaclass=metaclass):
+    pass
 
 class pickling_metaclass(type):
     def __eq__(self, other):
@@ -430,7 +430,7 @@ def create_data():
     c = C()
     c.foo = 1
     c.bar = 2
-    x = [0, 1L, 2.0, 3.0+0j]
+    x = [0, 1, 2.0, 3.0+0j]
     # Append some integer test cases at cPickle.c's internal size
     # cutoffs.
     uint1max = 0xff
@@ -498,7 +498,7 @@ class AbstractPickleTests(unittest.TestCase):
 
         for proto, expected in (0, DATA0_DIS), (1, DATA1_DIS):
             s = self.dumps(self._testdata, proto)
-            filelike = cStringIO.StringIO()
+            filelike = io.StringIO()
             dis(s, out=filelike)
             got = filelike.getvalue()
             self.assertEqual(expected, got)
@@ -528,7 +528,7 @@ class AbstractPickleTests(unittest.TestCase):
         for proto in protocols:
             s = self.dumps(d, proto)
             x = self.loads(s)
-            self.assertEqual(x.keys(), [1])
+            self.assertEqual(list(x.keys()), [1])
             self.assertTrue(x[1] is x)
 
     def test_recursive_inst(self):
@@ -551,7 +551,7 @@ class AbstractPickleTests(unittest.TestCase):
             x = self.loads(s)
             self.assertEqual(len(x), 1)
             self.assertEqual(dir(x[0]), dir(i))
-            self.assertEqual(x[0].attr.keys(), [1])
+            self.assertEqual(list(x[0].attr.keys()), [1])
             self.assertTrue(x[0].attr[1] is x)
 
     def test_garyp(self):
@@ -576,8 +576,8 @@ class AbstractPickleTests(unittest.TestCase):
 
     if have_unicode:
         def test_unicode(self):
-            endcases = [u'', u'<\\u>', u'<\\\u1234>', u'<\n>',
-                        u'<\\>', u'<\\\U00012345>']
+            endcases = ['', '<\\u>', '<\\\u1234>', '<\n>',
+                        '<\\>', '<\\\U00012345>']
             for proto in protocols:
                 for u in endcases:
                     p = self.dumps(u, proto)
@@ -585,7 +585,7 @@ class AbstractPickleTests(unittest.TestCase):
                     self.assertEqual(u2, u)
 
         def test_unicode_high_plane(self):
-            t = u'\U00012345'
+            t = '\U00012345'
             for proto in protocols:
                 p = self.dumps(t, proto)
                 t2 = self.loads(p)
@@ -594,7 +594,7 @@ class AbstractPickleTests(unittest.TestCase):
     def test_ints(self):
         import sys
         for proto in protocols:
-            n = sys.maxint
+            n = sys.maxsize
             while n:
                 for expected in (-n, n):
                     s = self.dumps(expected, proto)
@@ -603,7 +603,7 @@ class AbstractPickleTests(unittest.TestCase):
                 n = n >> 1
 
     def test_maxint64(self):
-        maxint64 = (1L << 63) - 1
+        maxint64 = (1 << 63) - 1
         data = 'I' + str(maxint64) + '\n.'
         got = self.loads(data)
         self.assertEqual(got, maxint64)
@@ -616,7 +616,7 @@ class AbstractPickleTests(unittest.TestCase):
         for proto in protocols:
             # 256 bytes is where LONG4 begins.
             for nbits in 1, 8, 8*254, 8*255, 8*256, 8*257:
-                nbase = 1L << nbits
+                nbase = 1 << nbits
                 for npos in nbase-1, nbase, nbase+1:
                     for n in npos, -npos:
                         pickle = self.dumps(n, proto)
@@ -624,7 +624,7 @@ class AbstractPickleTests(unittest.TestCase):
                         self.assertEqual(n, got)
         # Try a monster.  This is quadratic-time in protos 0 & 1, so don't
         # bother with those.
-        nbase = long("deadbeeffeedface", 16)
+        nbase = int("deadbeeffeedface", 16)
         nbase += nbase << 1000000
         for n in nbase, -nbase:
             p = self.dumps(n, 2)
@@ -661,7 +661,7 @@ class AbstractPickleTests(unittest.TestCase):
 
     def test_dynamic_class(self):
         a = create_dynamic_class("my_dynamic_class", (object,))
-        copy_reg.pickle(pickling_metaclass, pickling_metaclass.__reduce__)
+        copyreg.pickle(pickling_metaclass, pickling_metaclass.__reduce__)
         for proto in protocols:
             s = self.dumps(a, proto)
             b = self.loads(s)
@@ -702,14 +702,14 @@ class AbstractPickleTests(unittest.TestCase):
         badpickle = pickle.PROTO + chr(oob) + build_none
         try:
             self.loads(badpickle)
-        except ValueError, detail:
+        except ValueError as detail:
             self.assertTrue(str(detail).startswith(
                                             "unsupported pickle protocol"))
         else:
             self.fail("expected bad protocol number to raise ValueError")
 
     def test_long1(self):
-        x = 12345678910111213141516178920L
+        x = 12345678910111213141516178920
         for proto in protocols:
             s = self.dumps(x, proto)
             y = self.loads(s)
@@ -717,7 +717,7 @@ class AbstractPickleTests(unittest.TestCase):
             self.assertEqual(opcode_in_pickle(pickle.LONG1, s), proto >= 2)
 
     def test_long4(self):
-        x = 12345678910111213141516178920L << (256*8)
+        x = 12345678910111213141516178920 << (256*8)
         for proto in protocols:
             s = self.dumps(x, proto)
             y = self.loads(s)
@@ -847,7 +847,7 @@ class AbstractPickleTests(unittest.TestCase):
     def produce_global_ext(self, extcode, opcode):
         e = ExtensionSaver(extcode)
         try:
-            copy_reg.add_extension(__name__, "MyList", extcode)
+            copyreg.add_extension(__name__, "MyList", extcode)
             x = MyList([1, 2, 3])
             x.foo = 42
             x.bar = "hello"
@@ -891,7 +891,7 @@ class AbstractPickleTests(unittest.TestCase):
 
     def test_list_chunking(self):
         n = 10  # too small to chunk
-        x = range(n)
+        x = list(range(n))
         for proto in protocols:
             s = self.dumps(x, proto)
             y = self.loads(s)
@@ -900,7 +900,7 @@ class AbstractPickleTests(unittest.TestCase):
             self.assertEqual(num_appends, proto > 0)
 
         n = 2500  # expect at least two chunks when proto > 0
-        x = range(n)
+        x = list(range(n))
         for proto in protocols:
             s = self.dumps(x, proto)
             y = self.loads(s)
@@ -913,7 +913,7 @@ class AbstractPickleTests(unittest.TestCase):
 
     def test_dict_chunking(self):
         n = 10  # too small to chunk
-        x = dict.fromkeys(range(n))
+        x = dict.fromkeys(list(range(n)))
         for proto in protocols:
             s = self.dumps(x, proto)
             y = self.loads(s)
@@ -922,7 +922,7 @@ class AbstractPickleTests(unittest.TestCase):
             self.assertEqual(num_setitems, proto > 0)
 
         n = 2500  # expect at least two chunks when proto > 0
-        x = dict.fromkeys(range(n))
+        x = dict.fromkeys(list(range(n)))
         for proto in protocols:
             s = self.dumps(x, proto)
             y = self.loads(s)
@@ -1025,7 +1025,7 @@ class AbstractPickleTests(unittest.TestCase):
     def test_many_puts_and_gets(self):
         # Test that internal data structures correctly deal with lots of
         # puts/gets.
-        keys = ("aaa" + str(i) for i in xrange(100))
+        keys = ("aaa" + str(i) for i in range(100))
         large_dict = dict((k, [4, 5, 6]) for k in keys)
         obj = [dict(large_dict), dict(large_dict), dict(large_dict)]
 
@@ -1091,7 +1091,7 @@ class REX_three(object):
         self._proto = proto
         return REX_two, ()
     def __reduce__(self):
-        raise TestFailed, "This __reduce__ shouldn't be called"
+        raise TestFailed("This __reduce__ shouldn't be called")
 
 class REX_four(object):
     _proto = None
@@ -1117,7 +1117,7 @@ class MyInt(int):
     sample = 1
 
 class MyLong(long):
-    sample = 1L
+    sample = 1
 
 class MyFloat(float):
     sample = 1.0
@@ -1128,8 +1128,8 @@ class MyComplex(complex):
 class MyStr(str):
     sample = "hello"
 
-class MyUnicode(unicode):
-    sample = u"hello \u1234"
+class MyUnicode(str):
+    sample = "hello \u1234"
 
 class MyTuple(tuple):
     sample = (1, 2, 3)
@@ -1175,7 +1175,7 @@ class AbstractPickleModuleTests(unittest.TestCase):
             os.remove(TESTFN)
 
     def test_load_from_and_dump_to_file(self):
-        stream = cStringIO.StringIO()
+        stream = io.StringIO()
         data = [123, {}, 124]
         self.module.dump(data, stream)
         stream.seek(0)
@@ -1187,7 +1187,7 @@ class AbstractPickleModuleTests(unittest.TestCase):
         self.assertEqual(self.module.HIGHEST_PROTOCOL, 3)
 
     def test_callapi(self):
-        f = cStringIO.StringIO()
+        f = io.StringIO()
         # With and without keyword arguments
         self.module.dump(123, f, -1)
         self.module.dump(123, file=f, protocol=-1)
@@ -1197,7 +1197,7 @@ class AbstractPickleModuleTests(unittest.TestCase):
         self.module.Pickler(f, protocol=-1)
 
     def test_incomplete_input(self):
-        s = StringIO.StringIO("X''.")
+        s = io.StringIO("X''.")
         self.assertRaises(EOFError, self.module.load, s)
 
     @skipIf(_is_pypy or _is_jython, "Fails to access the redefined builtins")
@@ -1207,7 +1207,7 @@ class AbstractPickleModuleTests(unittest.TestCase):
                     '__import__': __import__}
         d = {}
         teststr = "def f(): pickleme.dumps(0)"
-        exec teststr in {'__builtins__': builtins}, d
+        exec(teststr, {'__builtins__': builtins}, d)
         d['f']()
 
     def test_bad_input(self):
@@ -1242,7 +1242,7 @@ class AbstractPersistentPicklerTests(unittest.TestCase
     def test_persistence(self):
         self.id_count = 0
         self.load_count = 0
-        L = range(10)
+        L = list(range(10))
         self.assertEqual(self.loads(self.dumps(L)), L)
         self.assertEqual(self.id_count, 5)
         self.assertEqual(self.load_count, 5)
@@ -1250,7 +1250,7 @@ class AbstractPersistentPicklerTests(unittest.TestCase
     def test_bin_persistence(self):
         self.id_count = 0
         self.load_count = 0
-        L = range(10)
+        L = list(range(10))
         self.assertEqual(self.loads(self.dumps(L, 1)), L)
         self.assertEqual(self.id_count, 5)
         self.assertEqual(self.load_count, 5)
@@ -1282,7 +1282,7 @@ class AbstractPicklerUnpicklerObjectTests(unittest.Tes
         # object again, the third serialized form should be identical to the
         # first one we obtained.
         data = ["abcdefg", "abcdefg", 44]
-        f = cStringIO.StringIO()
+        f = io.StringIO()
         pickler = self.pickler_class(f)
 
         pickler.dump(data)
@@ -1309,13 +1309,13 @@ class AbstractPicklerUnpicklerObjectTests(unittest.Tes
     def test_priming_pickler_memo(self):
         # Verify that we can set the Pickler's memo attribute.
         data = ["abcdefg", "abcdefg", 44]
-        f = cStringIO.StringIO()
+        f = io.StringIO()
         pickler = self.pickler_class(f)
 
         pickler.dump(data)
         first_pickled = f.getvalue()
 
-        f = cStringIO.StringIO()
+        f = io.StringIO()
         primed = self.pickler_class(f)
         primed.memo = pickler.memo
 
@@ -1327,25 +1327,25 @@ class AbstractPicklerUnpicklerObjectTests(unittest.Tes
     def test_priming_unpickler_memo(self):
         # Verify that we can set the Unpickler's memo attribute.
         data = ["abcdefg", "abcdefg", 44]
-        f = cStringIO.StringIO()
+        f = io.StringIO()
         pickler = self.pickler_class(f)
 
         pickler.dump(data)
         first_pickled = f.getvalue()
 
-        f = cStringIO.StringIO()
+        f = io.StringIO()
         primed = self.pickler_class(f)
         primed.memo = pickler.memo
 
         primed.dump(data)
         primed_pickled = f.getvalue()
 
-        unpickler = self.unpickler_class(cStringIO.StringIO(first_pickled))
+        unpickler = self.unpickler_class(io.StringIO(first_pickled))
         unpickled_data1 = unpickler.load()
 
         self.assertEqual(unpickled_data1, data)
 
-        primed = self.unpickler_class(cStringIO.StringIO(primed_pickled))
+        primed = self.unpickler_class(io.StringIO(primed_pickled))
         primed.memo = unpickler.memo
         unpickled_data2 = primed.load()
 
@@ -1356,18 +1356,18 @@ class AbstractPicklerUnpicklerObjectTests(unittest.Tes
 
     def test_reusing_unpickler_objects(self):
         data1 = ["abcdefg", "abcdefg", 44]
-        f = cStringIO.StringIO()
+        f = io.StringIO()
         pickler = self.pickler_class(f)
         pickler.dump(data1)
         pickled1 = f.getvalue()
 
         data2 = ["abcdefg", 44, 44]
-        f = cStringIO.StringIO()
+        f = io.StringIO()
         pickler = self.pickler_class(f)
         pickler.dump(data2)
         pickled2 = f.getvalue()
 
-        f = cStringIO.StringIO()
+        f = io.StringIO()
         f.write(pickled1)
         f.seek(0)
         unpickler = self.unpickler_class(f)
--- src/zodbpickle/tests/pickletester_3.py.orig	2021-09-29 06:13:32 UTC
+++ src/zodbpickle/tests/pickletester_3.py
@@ -39,7 +39,7 @@ from . import _is_pypy
 # Tests that try a number of pickle protocols should have a
 #     for proto in protocols:
 # kind of outer loop.
-protocols = range(pickle.HIGHEST_PROTOCOL + 1)
+protocols = list(range(pickle.HIGHEST_PROTOCOL + 1))
 
 ascii_char_size = 1
 
@@ -650,10 +650,10 @@ class AbstractPickleTests(unittest.TestCase):
             self.assertRaises(ValueError, self.loads, buf)
 
     def test_unicode(self):
-        endcases = ['', '<\\u>', '<\\\u1234>', '<\n>',
-                    '<\\>', '<\\\U00012345>',
+        endcases = ['', '<\\u>', '<\\\\u1234>', '<\n>',
+                    '<\\>', '<\\\\U00012345>',
                     # surrogates
-                    '<\udc80>']
+                    '<\\udc80>']
         for proto in protocols:
             for u in endcases:
                 p = self.dumps(u, proto)
@@ -661,7 +661,7 @@ class AbstractPickleTests(unittest.TestCase):
                 self.assertEqual(u2, u)
 
     def test_unicode_high_plane(self):
-        t = '\U00012345'
+        t = '\\U00012345'
         for proto in protocols:
             p = self.dumps(t, proto)
             t2 = self.loads(p)
@@ -1017,7 +1017,7 @@ class AbstractPickleTests(unittest.TestCase):
 
     def test_dict_chunking(self):
         n = 10  # too small to chunk
-        x = dict.fromkeys(range(n))
+        x = dict.fromkeys(list(range(n)))
         for proto in protocols:
             s = self.dumps(x, proto)
             self.assertIsInstance(s, bytes_types)
@@ -1027,7 +1027,7 @@ class AbstractPickleTests(unittest.TestCase):
             self.assertEqual(num_setitems, proto > 0)
 
         n = 2500  # expect at least two chunks when proto > 0
-        x = dict.fromkeys(range(n))
+        x = dict.fromkeys(list(range(n)))
         for proto in protocols:
             s = self.dumps(x, proto)
             y = self.loads(s)
@@ -1170,7 +1170,7 @@ class AbstractPickleTests(unittest.TestCase):
         loaded = self.loads(DATA3)
         self.assertEqual(loaded, set([1, 2]))
         loaded = self.loads(DATA4)
-        self.assertEqual(type(loaded), type(range(0)))
+        self.assertEqual(type(loaded), type(list(range(0))))
         self.assertEqual(list(loaded), list(range(5)))
         loaded = self.loads(DATA5)
         self.assertEqual(type(loaded), SimpleCookie)
@@ -1189,7 +1189,7 @@ class AbstractPickleTests(unittest.TestCase):
         # the same result as Python 2.x did.
         # NOTE: this test is a bit too strong since we can produce different
         # bytecode that 2.x will still understand.
-        dumped = self.dumps(range(5), 2)
+        dumped = self.dumps(list(range(5)), 2)
         self.assertEqual(dumped, DATA4)
 
         dumped = self.dumps(set([3]), 2)
@@ -1328,24 +1328,24 @@ class AbstractBytestrTests(unittest.TestCase):
 
     def test_load_unicode_protocol_0(self):
         """ Test unicode with protocol=0
-        python 2: pickle.dumps(u"\u041a\u043e\u043c\u043f\u044c\u044e\u0442\u0435\u0440", protocol=0) """
+        python 2: pickle.dumps(u"\\u041a\\u043e\\u043c\\u043f\\u044c\\u044e\\u0442\\u0435\\u0440", protocol=0) """
         self.unpickleEqual(
                 b'V\\u041a\\u043e\\u043c\\u043f\\u044c\\u044e\\u0442\\u0435\\u0440\np0\n.',
-                '\u041a\u043e\u043c\u043f\u044c\u044e\u0442\u0435\u0440')
+                '\\u041a\\u043e\\u043c\\u043f\\u044c\\u044e\\u0442\\u0435\\u0440')
 
     def test_load_unicode_protocol_1(self):
         """ Test unicode with protocol=1
-        python 2: pickle.dumps(u"\u041a\u043e\u043c\u043f\u044c\u044e\u0442\u0435\u0440", protocol=1) """
+        python 2: pickle.dumps(u"\\u041a\\u043e\\u043c\\u043f\\u044c\\u044e\\u0442\\u0435\\u0440", protocol=1) """
         self.unpickleEqual(
                 b'X\x12\x00\x00\x00\xd0\x9a\xd0\xbe\xd0\xbc\xd0\xbf\xd1\x8c\xd1\x8e\xd1\x82\xd0\xb5\xd1\x80q\x00.',
-                '\u041a\u043e\u043c\u043f\u044c\u044e\u0442\u0435\u0440')
+                '\\u041a\\u043e\\u043c\\u043f\\u044c\\u044e\\u0442\\u0435\\u0440')
 
     def test_load_unicode_protocol_2(self):
         """ Test unicode with protocol=1
-        python 2: pickle.dumps(u"\u041a\u043e\u043c\u043f\u044c\u044e\u0442\u0435\u0440", protocol=2) """
+        python 2: pickle.dumps(u"\\u041a\\u043e\\u043c\\u043f\\u044c\\u044e\\u0442\\u0435\\u0440", protocol=2) """
         self.unpickleEqual(
                 b'\x80\x02X\x12\x00\x00\x00\xd0\x9a\xd0\xbe\xd0\xbc\xd0\xbf\xd1\x8c\xd1\x8e\xd1\x82\xd0\xb5\xd1\x80q\x00.',
-                '\u041a\u043e\u043c\u043f\u044c\u044e\u0442\u0435\u0440')
+                '\\u041a\\u043e\\u043c\\u043f\\u044c\\u044e\\u0442\\u0435\\u0440')
 
     def test_load_long_str_protocol_1(self):
         """ Test long str with protocol=1
@@ -1511,7 +1511,7 @@ class REX_seven(object):
     def __setitem__(self, key, value):
         self.table[key] = value
     def __reduce__(self):
-        return type(self), (), None, None, iter(self.table.items())
+        return type(self), (), None, None, iter(list(self.table.items()))
 
 
 # Test classes for newobj
@@ -1529,7 +1529,7 @@ class MyStr(str):
     sample = "hello"
 
 class MyUnicode(str):
-    sample = "hello \u1234"
+    sample = "hello \\u1234"
 
 class MyTuple(tuple):
     sample = (1, 2, 3)
@@ -2028,14 +2028,14 @@ if __name__ == "__main__":
     x = create_data()
     for i in range(3):
         p = pickle.dumps(x, i)
-        print("DATA{0} = (".format(i))
+        print(("DATA{0} = (".format(i)))
         for j in range(0, len(p), 20):
             b = bytes(p[j:j+20])
-            print("    {0!r}".format(b))
+            print(("    {0!r}".format(b)))
         print(")")
         print()
-        print("# Disassembly of DATA{0}".format(i))
-        print("DATA{0}_DIS = \"\"\"\\".format(i))
+        print(("# Disassembly of DATA{0}".format(i)))
+        print(("DATA{0}_DIS = \"\"\"\\".format(i)))
         dis(p)
         print("\"\"\"")
         print()
--- src/zodbpickle/tests/test_pickle_2.py.orig	2021-09-29 06:13:32 UTC
+++ src/zodbpickle/tests/test_pickle_2.py
@@ -1,7 +1,7 @@
-import cStringIO
 import io
+import io
 import unittest
-from cStringIO import StringIO
+from io import StringIO
 
 from .pickletester_2 import (AbstractPickleTests,
                              AbstractPickleModuleTests,
@@ -13,7 +13,7 @@ from .pickletester_2 import (AbstractPickleTests,
 from test import test_support
 
 class cStringIOMixin:
-    output = input = cStringIO.StringIO
+    output = input = io.StringIO
 
     def close(self, f):
         pass
@@ -70,7 +70,7 @@ class PicklerTests(AbstractPickleTests):
 
     def dumps(self, arg, proto=0, fast=0):
         from zodbpickle.pickle_2 import Pickler
-        f = cStringIO.StringIO()
+        f = io.StringIO()
         p = Pickler(f, proto)
         if fast:
             p.fast = fast
@@ -80,7 +80,7 @@ class PicklerTests(AbstractPickleTests):
 
     def loads(self, buf):
         from zodbpickle.pickle_2 import Unpickler
-        f = cStringIO.StringIO(buf)
+        f = io.StringIO(buf)
         u = Unpickler(f)
         return u.load()
 
@@ -92,7 +92,7 @@ class PersPicklerTests(AbstractPersistentPicklerTests)
         class PersPickler(Pickler):
             def persistent_id(subself, obj):
                 return self.persistent_id(obj)
-        f = cStringIO.StringIO()
+        f = io.StringIO()
         p = PersPickler(f, proto)
         if fast:
             p.fast = fast
@@ -105,7 +105,7 @@ class PersPicklerTests(AbstractPersistentPicklerTests)
         class PersUnpickler(Unpickler):
             def persistent_load(subself, obj):
                 return self.persistent_load(obj)
-        f = cStringIO.StringIO(buf)
+        f = io.StringIO(buf)
         u = PersUnpickler(f)
         return u.load()