diff --git a/Demo/classes/Dbm.py b/Demo/classes/Dbm.py
index ecc117d4953..617fe998192 100755
--- a/Demo/classes/Dbm.py
+++ b/Demo/classes/Dbm.py
@@ -50,7 +50,7 @@ def test():
                 value = d[key]
                 print('currently:', value)
             value = eval(input('value: '))
-            if value == None:
+            if value is None:
                 del d[key]
             else:
                 d[key] = value
diff --git a/Demo/curses/ncurses.py b/Demo/curses/ncurses.py
index fc22ff7be5e..0bdc1a97e62 100644
--- a/Demo/curses/ncurses.py
+++ b/Demo/curses/ncurses.py
@@ -9,7 +9,7 @@ import curses
 from curses import panel
 
 def wGetchar(win = None):
-    if win == None: win = stdscr
+    if win is None: win = stdscr
     return win.getch()
 
 def Getchar():
diff --git a/Demo/rpc/mountclient.py b/Demo/rpc/mountclient.py
index 3bb88b1f85b..81797df8ba1 100644
--- a/Demo/rpc/mountclient.py
+++ b/Demo/rpc/mountclient.py
@@ -100,7 +100,7 @@ class PartialMountClient:
     # This function is called to cough up a suitable
     # authentication object for a call to procedure 'proc'.
     def mkcred(self):
-        if self.cred == None:
+        if self.cred is None:
             self.cred = rpc.AUTH_UNIX, rpc.make_auth_unix_default()
         return self.cred
 
diff --git a/Demo/rpc/nfsclient.py b/Demo/rpc/nfsclient.py
index aad8cf30009..c36e3d28dd6 100644
--- a/Demo/rpc/nfsclient.py
+++ b/Demo/rpc/nfsclient.py
@@ -129,7 +129,7 @@ class NFSClient(UDPClient):
         self.unpacker = NFSUnpacker('')
 
     def mkcred(self):
-        if self.cred == None:
+        if self.cred is None:
             self.cred = rpc.AUTH_UNIX, rpc.make_auth_unix_default()
         return self.cred
 
@@ -170,7 +170,7 @@ class NFSClient(UDPClient):
             for fileid, name, cookie in entries:
                 list.append((fileid, name))
                 last_cookie = cookie
-            if eof or last_cookie == None:
+            if eof or last_cookie is None:
                 break
             ra = (ra[0], last_cookie, ra[2])
         return list
@@ -184,7 +184,7 @@ def test():
     else: filesys = None
     from mountclient import UDPMountClient, TCPMountClient
     mcl = TCPMountClient(host)
-    if filesys == None:
+    if filesys is None:
         list = mcl.Export()
         for item in list:
             print(item)
diff --git a/Demo/rpc/rpc.py b/Demo/rpc/rpc.py
index 99115d34369..789880bbfc3 100644
--- a/Demo/rpc/rpc.py
+++ b/Demo/rpc/rpc.py
@@ -260,13 +260,13 @@ class Client:
 
     def mkcred(self):
         # Override this to use more powerful credentials
-        if self.cred == None:
+        if self.cred is None:
             self.cred = (AUTH_NULL, make_auth_null())
         return self.cred
 
     def mkverf(self):
         # Override this to use a more powerful verifier
-        if self.verf == None:
+        if self.verf is None:
             self.verf = (AUTH_NULL, make_auth_null())
         return self.verf
 
@@ -317,7 +317,7 @@ last_resv_port_tried = None
 def bindresvport(sock, host):
     global last_resv_port_tried
     FIRST, LAST = 600, 1024 # Range of ports to try
-    if last_resv_port_tried == None:
+    if last_resv_port_tried is None:
         import os
         last_resv_port_tried = FIRST + os.getpid() % (LAST-FIRST)
     for i in range(last_resv_port_tried, LAST) + \
@@ -811,7 +811,7 @@ class UDPServer(Server):
     def session(self):
         call, host_port = self.sock.recvfrom(8192)
         reply = self.handle(call)
-        if reply != None:
+        if reply is not None:
             self.sock.sendto(reply, host_port)
 
 
diff --git a/Demo/tkinter/guido/paint.py b/Demo/tkinter/guido/paint.py
index d46e20b9ade..7b2e814c657 100644
--- a/Demo/tkinter/guido/paint.py
+++ b/Demo/tkinter/guido/paint.py
@@ -50,7 +50,7 @@ def b1up(event):
 def motion(event):
     if b1 == "down":
         global xold, yold
-        if xold != None and yold != None:
+        if xold is not None and yold is not None:
             event.widget.create_line(xold,yold,event.x,event.y,smooth=TRUE)
                           # here's where you draw it. smooth. neat.
         xold = event.x
diff --git a/Doc/library/array.rst b/Doc/library/array.rst
index efe80b7f88f..08142e119fb 100644
--- a/Doc/library/array.rst
+++ b/Doc/library/array.rst
@@ -3,12 +3,12 @@
 ===================================================
 
 .. module:: array
-   :synopsis: Efficient arrays of uniformly typed numeric values.
+   :synopsis: Space efficient arrays of uniformly typed numeric values.
 
 
 .. index:: single: arrays
 
-This module defines an object type which can efficiently represent an array of
+This module defines an object type which can compactly represent an array of
 basic values: characters, integers, floating point numbers.  Arrays are sequence
 types and behave very much like lists, except that the type of objects stored in
 them is constrained.  The type is specified at object creation time by using a
diff --git a/Include/object.h b/Include/object.h
index b4b9ce24e4c..0c23e02e576 100644
--- a/Include/object.h
+++ b/Include/object.h
@@ -562,7 +562,7 @@ the refcount falls to 0; for
 objects that don't contain references to other objects or heap memory
 this can be the standard function free().  Both macros can be used
 wherever a void expression is allowed.  The argument must not be a
-NIL pointer.  If it may be NIL, use Py_XINCREF/Py_XDECREF instead.
+NULL pointer.  If it may be NULL, use Py_XINCREF/Py_XDECREF instead.
 The macro _Py_NewReference(op) initialize reference counts to 1, and
 in special builds (Py_REF_DEBUG, Py_TRACE_REFS) performs additional
 bookkeeping appropriate to the special build.
diff --git a/Lib/bsddb/dbshelve.py b/Lib/bsddb/dbshelve.py
index 3727270b905..7344945d593 100644
--- a/Lib/bsddb/dbshelve.py
+++ b/Lib/bsddb/dbshelve.py
@@ -135,7 +135,7 @@ class DBShelf(MutableMapping):
 
 
     def keys(self, txn=None):
-        if txn != None:
+        if txn is not None:
             return self.db.keys(txn)
         else:
             return self.db.keys()
@@ -161,7 +161,7 @@ class DBShelf(MutableMapping):
 
 
     def items(self, txn=None):
-        if txn != None:
+        if txn is not None:
             items = self.db.items(txn)
         else:
             items = self.db.items()
@@ -172,7 +172,7 @@ class DBShelf(MutableMapping):
         return newitems
 
     def values(self, txn=None):
-        if txn != None:
+        if txn is not None:
             values = self.db.values(txn)
         else:
             values = self.db.values()
diff --git a/Lib/bsddb/test/test_basics.py b/Lib/bsddb/test/test_basics.py
index 4e070bd0619..6b99cc1fdfb 100644
--- a/Lib/bsddb/test/test_basics.py
+++ b/Lib/bsddb/test/test_basics.py
@@ -366,7 +366,7 @@ class BasicTestCase(unittest.TestCase):
         else:
             if set_raises_error:
                 self.fail("expected exception")
-            if n != None:
+            if n is not None:
                 self.fail("expected None: %r" % (n,))
 
         rec = c.get_both(b'0404', self.makeData(b'0404'))
@@ -380,7 +380,7 @@ class BasicTestCase(unittest.TestCase):
         else:
             if get_raises_error:
                 self.fail("expected exception")
-            if n != None:
+            if n is not None:
                 self.fail("expected None: %r" % (n,))
 
         if self.d.get_type() == db.DB_BTREE:
diff --git a/Lib/bsddb/test/test_dbtables.py b/Lib/bsddb/test/test_dbtables.py
index 8964de83574..f1328f0c8cd 100644
--- a/Lib/bsddb/test/test_dbtables.py
+++ b/Lib/bsddb/test/test_dbtables.py
@@ -328,7 +328,7 @@ class TableDBTestCase(unittest.TestCase):
         self.tdb.Insert(tabname, {'Type': b'Unknown', 'Access': b'0'})
 
         def set_type(type):
-            if type == None:
+            if type is None:
                 return b'MP3'
             return type
 
diff --git a/Lib/idlelib/AutoComplete.py b/Lib/idlelib/AutoComplete.py
index b2b165789f2..ac0827cc61f 100644
--- a/Lib/idlelib/AutoComplete.py
+++ b/Lib/idlelib/AutoComplete.py
@@ -35,10 +35,9 @@ class AutoComplete:
                                    "popupwait", type="int", default=0)
 
     def __init__(self, editwin=None):
-        if editwin == None:  # subprocess and test
-            self.editwin = None
-            return
         self.editwin = editwin
+        if editwin is None:  # subprocess and test
+            return
         self.text = editwin.text
         self.autocompletewindow = None
 
diff --git a/Lib/idlelib/PyShell.py b/Lib/idlelib/PyShell.py
index 434df67b09c..7c66088f56d 100644
--- a/Lib/idlelib/PyShell.py
+++ b/Lib/idlelib/PyShell.py
@@ -922,7 +922,7 @@ class PyShell(OutputWindow):
                 "The program is still running!\n Do you want to kill it?",
                 default="ok",
                 parent=self.text)
-            if response == False:
+            if response is False:
                 return "cancel"
         if self.reading:
             self.top.quit()
diff --git a/Lib/lib-tk/Tkinter.py b/Lib/lib-tk/Tkinter.py
index 33b5ed01743..23ebe547509 100644
--- a/Lib/lib-tk/Tkinter.py
+++ b/Lib/lib-tk/Tkinter.py
@@ -187,7 +187,7 @@ class Variable:
         else:
             self._name = 'PY_VAR' + repr(_varnum)
             _varnum += 1
-        if value != None:
+        if value is not None:
             self.set(value)
         elif not self._tk.call("info", "exists", self._name):
             self.set(self._default)
diff --git a/Lib/lib-tk/turtle.py b/Lib/lib-tk/turtle.py
index 7cf298d799c..960a9f61d50 100644
--- a/Lib/lib-tk/turtle.py
+++ b/Lib/lib-tk/turtle.py
@@ -749,25 +749,25 @@ def setup(**geometry):
     global _width, _height, _startx, _starty
 
     width = geometry.get('width',_width)
-    if width is None or width >= 0:
+    if width >= 0 or width is None:
         _width = width
     else:
         raise ValueError("width can not be less than 0")
 
     height = geometry.get('height',_height)
-    if height is None or height >= 0:
+    if height >= 0 or height is None:
         _height = height
     else:
         raise ValueError("height can not be less than 0")
 
     startx = geometry.get('startx', _startx)
-    if startx is None or startx >= 0:
+    if startx >= 0 or startx is None:
         _startx = _startx
     else:
         raise ValueError("startx can not be less than 0")
 
     starty = geometry.get('starty', _starty)
-    if starty is None or starty >= 0:
+    if starty >= 0 or starty is None:
         _starty = starty
     else:
         raise ValueError("startx can not be less than 0")
diff --git a/Lib/lib2to3/refactor.py b/Lib/lib2to3/refactor.py
index 49c9a03ae5c..ae7d3cdfcd8 100755
--- a/Lib/lib2to3/refactor.py
+++ b/Lib/lib2to3/refactor.py
@@ -28,15 +28,6 @@ from . import patcomp
 from . import fixes
 from . import pygram
 
-if sys.version_info < (2, 4):
-    hdlr = logging.StreamHandler()
-    fmt = logging.Formatter('%(name)s: %(message)s')
-    hdlr.setFormatter(fmt)
-    logging.root.addHandler(hdlr)
-else:
-    logging.basicConfig(format='%(name)s: %(message)s', level=logging.INFO)
-
-
 def main(args=None):
     """Main program.
 
@@ -73,6 +64,15 @@ def main(args=None):
         print("Use --help to show usage.", file=sys.stderr)
         return 2
 
+    # Set up logging handler
+    if sys.version_info < (2, 4):
+        hdlr = logging.StreamHandler()
+        fmt = logging.Formatter('%(name)s: %(message)s')
+        hdlr.setFormatter(fmt)
+        logging.root.addHandler(hdlr)
+    else:
+        logging.basicConfig(format='%(name)s: %(message)s', level=logging.INFO)
+
     # Initialize the refactoring tool
     rt = RefactoringTool(options)
 
diff --git a/Lib/plat-mac/EasyDialogs.py b/Lib/plat-mac/EasyDialogs.py
index 68beafa194f..f697417a506 100644
--- a/Lib/plat-mac/EasyDialogs.py
+++ b/Lib/plat-mac/EasyDialogs.py
@@ -78,7 +78,7 @@ def Message(msg, id=260, ok=None):
         return
     h = d.GetDialogItemAsControl(2)
     SetDialogItemText(h, lf2cr(msg))
-    if ok != None:
+    if ok is not None:
         h = d.GetDialogItemAsControl(1)
         h.SetControlTitle(ok)
     d.SetDialogDefaultItem(1)
@@ -115,10 +115,10 @@ def AskString(prompt, default = "", id=261, ok=None, cancel=None):
     SetDialogItemText(h, lf2cr(default))
     d.SelectDialogItemText(4, 0, 999)
 #       d.SetDialogItem(4, 0, 255)
-    if ok != None:
+    if ok is not None:
         h = d.GetDialogItemAsControl(1)
         h.SetControlTitle(ok)
-    if cancel != None:
+    if cancel is not None:
         h = d.GetDialogItemAsControl(2)
         h.SetControlTitle(cancel)
     d.SetDialogDefaultItem(1)
@@ -159,10 +159,10 @@ def AskPassword(prompt,  default='', id=264, ok=None, cancel=None):
     SetControlData(pwd, kControlEditTextPart, kControlEditTextPasswordTag, default)
     d.SelectDialogItemText(4, 0, 999)
     Ctl.SetKeyboardFocus(d.GetDialogWindow(), pwd, kControlEditTextPart)
-    if ok != None:
+    if ok is not None:
         h = d.GetDialogItemAsControl(1)
         h.SetControlTitle(ok)
-    if cancel != None:
+    if cancel is not None:
         h = d.GetDialogItemAsControl(2)
         h.SetControlTitle(cancel)
     d.SetDialogDefaultItem(Dialogs.ok)
@@ -203,19 +203,19 @@ def AskYesNoCancel(question, default = 0, yes=None, no=None, cancel=None, id=262
     # The question string is item 5
     h = d.GetDialogItemAsControl(5)
     SetDialogItemText(h, lf2cr(question))
-    if yes != None:
+    if yes is not None:
         if yes == '':
             d.HideDialogItem(2)
         else:
             h = d.GetDialogItemAsControl(2)
             h.SetControlTitle(yes)
-    if no != None:
+    if no is not None:
         if no == '':
             d.HideDialogItem(3)
         else:
             h = d.GetDialogItemAsControl(3)
             h.SetControlTitle(no)
-    if cancel != None:
+    if cancel is not None:
         if cancel == '':
             d.HideDialogItem(4)
         else:
@@ -316,7 +316,7 @@ class ProgressBar:
 
     def set(self, value, max=None):
         """set(value) - Set progress bar position"""
-        if max != None:
+        if max is not None:
             self.maxval = max
             bar = self.d.GetDialogItemAsControl(3)
             if max <= 0:    # indeterminate bar
diff --git a/Lib/plat-mac/FrameWork.py b/Lib/plat-mac/FrameWork.py
index 8f8be55349e..fabd97e9471 100644
--- a/Lib/plat-mac/FrameWork.py
+++ b/Lib/plat-mac/FrameWork.py
@@ -92,7 +92,7 @@ _watch = None
 def setwatchcursor():
     global _watch
 
-    if _watch == None:
+    if _watch is None:
         _watch = GetCursor(4).data
     SetCursor(_watch)
 
@@ -129,7 +129,7 @@ class Application:
         self._quititem = MenuItem(m, "Quit", "Q", self._quit)
 
     def gethelpmenu(self):
-        if self._helpmenu == None:
+        if self._helpmenu is None:
             self._helpmenu = HelpMenu(self.menubar)
         return self._helpmenu
 
@@ -266,7 +266,7 @@ class Application:
         else:
             name = "do_%d" % partcode
 
-        if wid == None:
+        if wid is None:
             # No window, or a non-python window
             try:
                 handler = getattr(self, name)
@@ -475,7 +475,7 @@ class MenuBar:
         self.menus = None
 
     def addmenu(self, title, after = 0, id=None):
-        if id == None:
+        if id is None:
             id = self.getnextid()
         if DEBUG: print('Newmenu', title, id) # XXXX
         m = NewMenu(id, title)
@@ -907,8 +907,8 @@ class ScrolledWindow(ControlsWindow):
         self.barx_enabled = self.bary_enabled = 1
         x0, y0, x1, y1 = self.wid.GetWindowPort().GetPortBounds()
         vx, vy = self.getscrollbarvalues()
-        if vx == None: self.barx_enabled, vx = 0, 0
-        if vy == None: self.bary_enabled, vy = 0, 0
+        if vx is None: self.barx_enabled, vx = 0, 0
+        if vy is None: self.bary_enabled, vy = 0, 0
         if wantx:
             rect = x0-1, y1-(SCROLLBARWIDTH-1), x1-(SCROLLBARWIDTH-2), y1+1
             self.barx = NewControl(self.wid, rect, "", 1, vx, 0, 32767, 16, 0)
@@ -1007,7 +1007,7 @@ class ScrolledWindow(ControlsWindow):
         SetPort(self.wid)
         vx, vy = self.getscrollbarvalues()
         if self.barx:
-            if vx == None:
+            if vx is None:
                 self.barx.HiliteControl(255)
                 self.barx_enabled = 0
             else:
@@ -1017,7 +1017,7 @@ class ScrolledWindow(ControlsWindow):
                         self.barx.HiliteControl(0)
                 self.barx.SetControlValue(vx)
         if self.bary:
-            if vy == None:
+            if vy is None:
                 self.bary.HiliteControl(255)
                 self.bary_enabled = 0
             else:
diff --git a/Lib/plat-mac/MiniAEFrame.py b/Lib/plat-mac/MiniAEFrame.py
index e2f7cec3391..16f44d95108 100644
--- a/Lib/plat-mac/MiniAEFrame.py
+++ b/Lib/plat-mac/MiniAEFrame.py
@@ -159,7 +159,7 @@ class AEServer:
             #Same try/except comment as above
             rv = _function(**_parameters)
 
-        if rv == None:
+        if rv is None:
             aetools.packevent(_reply, {})
         else:
             aetools.packevent(_reply, {'----':rv})
diff --git a/Lib/plat-mac/PixMapWrapper.py b/Lib/plat-mac/PixMapWrapper.py
index a4bacaa6b77..98abb4afe29 100644
--- a/Lib/plat-mac/PixMapWrapper.py
+++ b/Lib/plat-mac/PixMapWrapper.py
@@ -147,9 +147,9 @@ class PixMapWrapper:
         """Draw this pixmap into the given (default current) grafport."""
         src = self.bounds
         dest = [x1,y1,x2,y2]
-        if x2 == None:
+        if x2 is None:
             dest[2] = x1 + src[2]-src[0]
-        if y2 == None:
+        if y2 is None:
             dest[3] = y1 + src[3]-src[1]
         if not port: port = Qd.GetPort()
         Qd.CopyBits(self.PixMap(), port.GetPortBitMapForCopyBits(), src, tuple(dest),
diff --git a/Lib/plat-mac/aepack.py b/Lib/plat-mac/aepack.py
index b0301409ded..c082b1dfe4f 100644
--- a/Lib/plat-mac/aepack.py
+++ b/Lib/plat-mac/aepack.py
@@ -82,7 +82,7 @@ def pack(x, forcetype = None):
         else:
             return pack(x).AECoerceDesc(forcetype)
 
-    if x == None:
+    if x is None:
         return AE.AECreateDesc(b'null', '')
 
     if isinstance(x, AEDescType):
diff --git a/Lib/plat-mac/buildtools.py b/Lib/plat-mac/buildtools.py
index 15450142233..87a099e2b0b 100644
--- a/Lib/plat-mac/buildtools.py
+++ b/Lib/plat-mac/buildtools.py
@@ -203,13 +203,13 @@ def process_common(template, progress, code, rsrcname, destname, is_update,
     dummy, tmplowner = copyres(input, output, skiptypes, 1, progress)
 
     Res.CloseResFile(input)
-##  if ownertype == None:
+##  if ownertype is None:
 ##      raise BuildError, "No owner resource found in either resource file or template"
     # Make sure we're manipulating the output resource file now
 
     Res.UseResFile(output)
 
-    if ownertype == None:
+    if ownertype is None:
         # No owner resource in the template. We have skipped the
         # Python owner resource, so we have to add our own. The relevant
         # bundle stuff is already included in the interpret/applet template.
diff --git a/Lib/plat-mac/findertools.py b/Lib/plat-mac/findertools.py
index bebd2a0d7dd..9bb35e622ea 100644
--- a/Lib/plat-mac/findertools.py
+++ b/Lib/plat-mac/findertools.py
@@ -124,7 +124,7 @@ def comment(object, comment=None):
     """comment: get or set the Finder-comment of the item, displayed in the 'Get Info' window."""
     object = Carbon.File.FSRef(object)
     object_alias = object.FSNewAliasMonimal()
-    if comment == None:
+    if comment is None:
         return _getcomment(object_alias)
     else:
         return _setcomment(object_alias, comment)
@@ -329,7 +329,7 @@ def label(object, index=None):
     """label: set or get the label of the item. Specify file by name or fsspec."""
     object = Carbon.File.FSRef(object)
     object_alias = object.FSNewAliasMinimal()
-    if index == None:
+    if index is None:
         return _getlabel(object_alias)
     if index < 0 or index > 7:
         index = 0
@@ -375,7 +375,7 @@ def windowview(folder, view=None):
     """
     fsr = Carbon.File.FSRef(folder)
     folder_alias = fsr.FSNewAliasMinimal()
-    if view == None:
+    if view is None:
         return _getwindowview(folder_alias)
     return _setwindowview(folder_alias, view)
 
@@ -535,7 +535,7 @@ def icon(object, icondata=None):
     Development opportunity: get and set the data as PICT."""
     fsr = Carbon.File.FSRef(object)
     object_alias = fsr.FSNewAliasMinimal()
-    if icondata == None:
+    if icondata is None:
         return _geticon(object_alias)
     return _seticon(object_alias, icondata)
 
diff --git a/Lib/plat-mac/gensuitemodule.py b/Lib/plat-mac/gensuitemodule.py
index 9d4df6dd39d..c3b42e48a6a 100644
--- a/Lib/plat-mac/gensuitemodule.py
+++ b/Lib/plat-mac/gensuitemodule.py
@@ -770,7 +770,7 @@ class SuiteCompiler:
             fp.write("        if _object:\n")
             fp.write("            _arguments['----'] = _object\n")
         else:
-            fp.write("        if _no_object != None: raise TypeError, 'No direct arg expected'\n")
+            fp.write("        if _no_object is not None: raise TypeError, 'No direct arg expected'\n")
         fp.write("\n")
         #
         # Do enum-name substitution
diff --git a/Lib/plat-mac/ic.py b/Lib/plat-mac/ic.py
index 5a377ebcbd2..f4f837052fc 100644
--- a/Lib/plat-mac/ic.py
+++ b/Lib/plat-mac/ic.py
@@ -198,12 +198,12 @@ class IC:
         self.ic.ICLaunchURL(hint, url, 0, len(url))
 
     def parseurl(self, data, start=None, end=None, hint=""):
-        if start == None:
+        if start is None:
             selStart = 0
             selEnd = len(data)
         else:
             selStart = selEnd = start
-        if end != None:
+        if end is not None:
             selEnd = end
         selStart, selEnd = self.ic.ICParseURL(hint, data, selStart, selEnd, self.h)
         return self.h.data, selStart, selEnd
@@ -227,27 +227,27 @@ _dft_ic = None
 
 def launchurl(url, hint=""):
     global _dft_ic
-    if _dft_ic == None: _dft_ic = IC()
+    if _dft_ic is None: _dft_ic = IC()
     return _dft_ic.launchurl(url, hint)
 
 def parseurl(data, start=None, end=None, hint=""):
     global _dft_ic
-    if _dft_ic == None: _dft_ic = IC()
+    if _dft_ic is None: _dft_ic = IC()
     return _dft_ic.parseurl(data, start, end, hint)
 
 def mapfile(filename):
     global _dft_ic
-    if _dft_ic == None: _dft_ic = IC()
+    if _dft_ic is None: _dft_ic = IC()
     return _dft_ic.mapfile(filename)
 
 def maptypecreator(type, creator, filename=""):
     global _dft_ic
-    if _dft_ic == None: _dft_ic = IC()
+    if _dft_ic is None: _dft_ic = IC()
     return _dft_ic.maptypecreator(type, creator, filename)
 
 def settypecreator(file):
     global _dft_ic
-    if _dft_ic == None: _dft_ic = IC()
+    if _dft_ic is None: _dft_ic = IC()
     return _dft_ic.settypecreator(file)
 
 def _test():
diff --git a/Lib/plat-mac/lib-scriptpackages/CodeWarrior/CodeWarrior_suite.py b/Lib/plat-mac/lib-scriptpackages/CodeWarrior/CodeWarrior_suite.py
index 11069374159..ab1fd6aaaf8 100644
--- a/Lib/plat-mac/lib-scriptpackages/CodeWarrior/CodeWarrior_suite.py
+++ b/Lib/plat-mac/lib-scriptpackages/CodeWarrior/CodeWarrior_suite.py
@@ -51,7 +51,7 @@ class CodeWarrior_suite_Events:
         _subcode = 'MAKE'
 
         if _arguments: raise TypeError('No optional args expected')
-        if _no_object != None: raise TypeError('No direct arg expected')
+        if _no_object is not None: raise TypeError('No direct arg expected')
 
 
         _reply, _arguments, _attributes = self.send(_code, _subcode,
@@ -135,7 +135,8 @@ class CodeWarrior_suite_Events:
         _subcode = 'EXPT'
 
         aetools.keysubst(_arguments, self._argmap_export)
-        if _no_object != None: raise TypeError('No direct arg expected')
+        if _arguments: raise TypeError('No optional args expected')
+        if _no_object is not None: raise TypeError('No direct arg expected')
 
 
         _reply, _arguments, _attributes = self.send(_code, _subcode,
@@ -154,7 +155,7 @@ class CodeWarrior_suite_Events:
         _subcode = 'RMOB'
 
         if _arguments: raise TypeError('No optional args expected')
-        if _no_object != None: raise TypeError('No direct arg expected')
+        if _no_object is not None: raise TypeError('No direct arg expected')
 
 
         _reply, _arguments, _attributes = self.send(_code, _subcode,
@@ -193,7 +194,7 @@ class CodeWarrior_suite_Events:
         _subcode = 'RUN '
 
         if _arguments: raise TypeError('No optional args expected')
-        if _no_object != None: raise TypeError('No direct arg expected')
+        if _no_object is not None: raise TypeError('No direct arg expected')
 
 
         _reply, _arguments, _attributes = self.send(_code, _subcode,
@@ -232,7 +233,7 @@ class CodeWarrior_suite_Events:
         _subcode = 'UP2D'
 
         if _arguments: raise TypeError('No optional args expected')
-        if _no_object != None: raise TypeError('No direct arg expected')
+        if _no_object is not None: raise TypeError('No direct arg expected')
 
 
         _reply, _arguments, _attributes = self.send(_code, _subcode,
diff --git a/Lib/plat-mac/lib-scriptpackages/CodeWarrior/Metrowerks_Shell_Suite.py b/Lib/plat-mac/lib-scriptpackages/CodeWarrior/Metrowerks_Shell_Suite.py
index 4a9cc5e7a5b..48f42fdc51d 100644
--- a/Lib/plat-mac/lib-scriptpackages/CodeWarrior/Metrowerks_Shell_Suite.py
+++ b/Lib/plat-mac/lib-scriptpackages/CodeWarrior/Metrowerks_Shell_Suite.py
@@ -72,7 +72,7 @@ class Metrowerks_Shell_Suite_Events:
         _subcode = 'ClsP'
 
         if _arguments: raise TypeError('No optional args expected')
-        if _no_object != None: raise TypeError('No direct arg expected')
+        if _no_object is not None: raise TypeError('No direct arg expected')
 
 
         _reply, _arguments, _attributes = self.send(_code, _subcode,
@@ -190,7 +190,7 @@ class Metrowerks_Shell_Suite_Events:
         _subcode = 'GDoc'
 
         if _arguments: raise TypeError('No optional args expected')
-        if _no_object != None: raise TypeError('No direct arg expected')
+        if _no_object is not None: raise TypeError('No direct arg expected')
 
 
         _reply, _arguments, _attributes = self.send(_code, _subcode,
@@ -217,7 +217,8 @@ class Metrowerks_Shell_Suite_Events:
         _subcode = 'Gref'
 
         aetools.keysubst(_arguments, self._argmap_Get_Preferences)
-        if _no_object != None: raise TypeError('No direct arg expected')
+        if _arguments: raise TypeError('No optional args expected')
+        if _no_object is not None: raise TypeError('No direct arg expected')
 
 
         _reply, _arguments, _attributes = self.send(_code, _subcode,
@@ -263,7 +264,7 @@ class Metrowerks_Shell_Suite_Events:
         _subcode = 'GetP'
 
         if _arguments: raise TypeError('No optional args expected')
-        if _no_object != None: raise TypeError('No direct arg expected')
+        if _no_object is not None: raise TypeError('No direct arg expected')
 
 
         _reply, _arguments, _attributes = self.send(_code, _subcode,
@@ -283,7 +284,7 @@ class Metrowerks_Shell_Suite_Events:
         _subcode = 'GSeg'
 
         if _arguments: raise TypeError('No optional args expected')
-        if _no_object != None: raise TypeError('No direct arg expected')
+        if _no_object is not None: raise TypeError('No direct arg expected')
 
 
         _reply, _arguments, _attributes = self.send(_code, _subcode,
@@ -324,7 +325,7 @@ class Metrowerks_Shell_Suite_Events:
         _subcode = 'NsCl'
 
         if _arguments: raise TypeError('No optional args expected')
-        if _no_object != None: raise TypeError('No direct arg expected')
+        if _no_object is not None: raise TypeError('No direct arg expected')
 
 
         _reply, _arguments, _attributes = self.send(_code, _subcode,
@@ -410,7 +411,8 @@ class Metrowerks_Shell_Suite_Events:
         _subcode = 'Make'
 
         aetools.keysubst(_arguments, self._argmap_Make_Project)
-        if _no_object != None: raise TypeError('No direct arg expected')
+        if _arguments: raise TypeError('No optional args expected')
+        if _no_object is not None: raise TypeError('No direct arg expected')
 
 
         _reply, _arguments, _attributes = self.send(_code, _subcode,
@@ -503,7 +505,7 @@ class Metrowerks_Shell_Suite_Events:
         _subcode = 'RemB'
 
         if _arguments: raise TypeError('No optional args expected')
-        if _no_object != None: raise TypeError('No direct arg expected')
+        if _no_object is not None: raise TypeError('No direct arg expected')
 
 
         _reply, _arguments, _attributes = self.send(_code, _subcode,
@@ -543,7 +545,7 @@ class Metrowerks_Shell_Suite_Events:
         _subcode = 'ReFP'
 
         if _arguments: raise TypeError('No optional args expected')
-        if _no_object != None: raise TypeError('No direct arg expected')
+        if _no_object is not None: raise TypeError('No direct arg expected')
 
 
         _reply, _arguments, _attributes = self.send(_code, _subcode,
@@ -570,7 +572,8 @@ class Metrowerks_Shell_Suite_Events:
         _subcode = 'RunP'
 
         aetools.keysubst(_arguments, self._argmap_Run_Project)
-        if _no_object != None: raise TypeError('No direct arg expected')
+        if _arguments: raise TypeError('No optional args expected')
+        if _no_object is not None: raise TypeError('No direct arg expected')
 
 
         _reply, _arguments, _attributes = self.send(_code, _subcode,
@@ -682,7 +685,8 @@ class Metrowerks_Shell_Suite_Events:
         _subcode = 'Pref'
 
         aetools.keysubst(_arguments, self._argmap_Set_Preferences)
-        if _no_object != None: raise TypeError('No direct arg expected')
+        if _arguments: raise TypeError('No optional args expected')
+        if _no_object is not None: raise TypeError('No direct arg expected')
 
 
         _reply, _arguments, _attributes = self.send(_code, _subcode,
@@ -778,7 +782,8 @@ class Metrowerks_Shell_Suite_Events:
         _subcode = 'UpdP'
 
         aetools.keysubst(_arguments, self._argmap_Update_Project)
-        if _no_object != None: raise TypeError('No direct arg expected')
+        if _arguments: raise TypeError('No optional args expected')
+        if _no_object is not None: raise TypeError('No direct arg expected')
 
 
         _reply, _arguments, _attributes = self.send(_code, _subcode,
diff --git a/Lib/plat-mac/lib-scriptpackages/CodeWarrior/Standard_Suite.py b/Lib/plat-mac/lib-scriptpackages/CodeWarrior/Standard_Suite.py
index 54deabb8107..a0df41e1636 100644
--- a/Lib/plat-mac/lib-scriptpackages/CodeWarrior/Standard_Suite.py
+++ b/Lib/plat-mac/lib-scriptpackages/CodeWarrior/Standard_Suite.py
@@ -115,7 +115,7 @@ class Standard_Suite_Events(Standard_Suite_Events):
         _subcode = 'crel'
 
         aetools.keysubst(_arguments, self._argmap_make)
-        if _no_object != None: raise TypeError('No direct arg expected')
+        if _no_object is not None: raise TypeError('No direct arg expected')
 
 
         _reply, _arguments, _attributes = self.send(_code, _subcode,
diff --git a/Lib/plat-mac/lib-scriptpackages/Explorer/Required_Suite.py b/Lib/plat-mac/lib-scriptpackages/Explorer/Required_Suite.py
index 7c902fb99f1..cc6ef6f51e4 100644
--- a/Lib/plat-mac/lib-scriptpackages/Explorer/Required_Suite.py
+++ b/Lib/plat-mac/lib-scriptpackages/Explorer/Required_Suite.py
@@ -61,7 +61,7 @@ class Required_Suite_Events(Required_Suite_Events):
         _subcode = 'quit'
 
         if _arguments: raise TypeError('No optional args expected')
-        if _no_object != None: raise TypeError('No direct arg expected')
+        if _no_object is not None: raise TypeError('No direct arg expected')
 
 
         _reply, _arguments, _attributes = self.send(_code, _subcode,
@@ -80,7 +80,7 @@ class Required_Suite_Events(Required_Suite_Events):
         _subcode = 'oapp'
 
         if _arguments: raise TypeError('No optional args expected')
-        if _no_object != None: raise TypeError('No direct arg expected')
+        if _no_object is not None: raise TypeError('No direct arg expected')
 
 
         _reply, _arguments, _attributes = self.send(_code, _subcode,
diff --git a/Lib/plat-mac/lib-scriptpackages/Explorer/Web_Browser_Suite.py b/Lib/plat-mac/lib-scriptpackages/Explorer/Web_Browser_Suite.py
index 78c58c8ea0f..a7e4a8cf266 100644
--- a/Lib/plat-mac/lib-scriptpackages/Explorer/Web_Browser_Suite.py
+++ b/Lib/plat-mac/lib-scriptpackages/Explorer/Web_Browser_Suite.py
@@ -42,7 +42,7 @@ class Web_Browser_Suite_Events:
         _subcode = 'CLSA'
 
         if _arguments: raise TypeError('No optional args expected')
-        if _no_object != None: raise TypeError('No direct arg expected')
+        if _no_object is not None: raise TypeError('No direct arg expected')
 
 
         _reply, _arguments, _attributes = self.send(_code, _subcode,
@@ -69,7 +69,8 @@ class Web_Browser_Suite_Events:
         _subcode = 'CLOS'
 
         aetools.keysubst(_arguments, self._argmap_CloseWindow)
-        if _no_object != None: raise TypeError('No direct arg expected')
+        if _arguments: raise TypeError('No optional args expected')
+        if _no_object is not None: raise TypeError('No direct arg expected')
 
 
         _reply, _arguments, _attributes = self.send(_code, _subcode,
@@ -110,7 +111,7 @@ class Web_Browser_Suite_Events:
         _subcode = 'LSTW'
 
         if _arguments: raise TypeError('No optional args expected')
-        if _no_object != None: raise TypeError('No direct arg expected')
+        if _no_object is not None: raise TypeError('No direct arg expected')
 
 
         _reply, _arguments, _attributes = self.send(_code, _subcode,
diff --git a/Lib/plat-mac/lib-scriptpackages/Finder/Finder_Basics.py b/Lib/plat-mac/lib-scriptpackages/Finder/Finder_Basics.py
index 4afe48a165f..3433d7a8c76 100644
--- a/Lib/plat-mac/lib-scriptpackages/Finder/Finder_Basics.py
+++ b/Lib/plat-mac/lib-scriptpackages/Finder/Finder_Basics.py
@@ -20,7 +20,7 @@ class Finder_Basics_Events:
         _subcode = 'copy'
 
         if _arguments: raise TypeError('No optional args expected')
-        if _no_object != None: raise TypeError('No direct arg expected')
+        if _no_object is not None: raise TypeError('No direct arg expected')
 
 
         _reply, _arguments, _attributes = self.send(_code, _subcode,
diff --git a/Lib/plat-mac/lib-scriptpackages/Finder/Legacy_suite.py b/Lib/plat-mac/lib-scriptpackages/Finder/Legacy_suite.py
index c2eb48aad61..fc9da2e7f23 100644
--- a/Lib/plat-mac/lib-scriptpackages/Finder/Legacy_suite.py
+++ b/Lib/plat-mac/lib-scriptpackages/Finder/Legacy_suite.py
@@ -20,7 +20,7 @@ class Legacy_suite_Events:
         _subcode = 'rest'
 
         if _arguments: raise TypeError('No optional args expected')
-        if _no_object != None: raise TypeError('No direct arg expected')
+        if _no_object is not None: raise TypeError('No direct arg expected')
 
 
         _reply, _arguments, _attributes = self.send(_code, _subcode,
@@ -39,7 +39,7 @@ class Legacy_suite_Events:
         _subcode = 'shut'
 
         if _arguments: raise TypeError('No optional args expected')
-        if _no_object != None: raise TypeError('No direct arg expected')
+        if _no_object is not None: raise TypeError('No direct arg expected')
 
 
         _reply, _arguments, _attributes = self.send(_code, _subcode,
@@ -58,7 +58,7 @@ class Legacy_suite_Events:
         _subcode = 'slep'
 
         if _arguments: raise TypeError('No optional args expected')
-        if _no_object != None: raise TypeError('No direct arg expected')
+        if _no_object is not None: raise TypeError('No direct arg expected')
 
 
         _reply, _arguments, _attributes = self.send(_code, _subcode,
diff --git a/Lib/plat-mac/lib-scriptpackages/Finder/Standard_Suite.py b/Lib/plat-mac/lib-scriptpackages/Finder/Standard_Suite.py
index ff28486eaa5..ff75edc4b9d 100644
--- a/Lib/plat-mac/lib-scriptpackages/Finder/Standard_Suite.py
+++ b/Lib/plat-mac/lib-scriptpackages/Finder/Standard_Suite.py
@@ -179,7 +179,7 @@ class Standard_Suite_Events(Standard_Suite_Events):
         _subcode = 'crel'
 
         aetools.keysubst(_arguments, self._argmap_make)
-        if _no_object != None: raise TypeError('No direct arg expected')
+        if _no_object is not None: raise TypeError('No direct arg expected')
 
 
         _reply, _arguments, _attributes = self.send(_code, _subcode,
@@ -285,7 +285,7 @@ class Standard_Suite_Events(Standard_Suite_Events):
         _subcode = 'quit'
 
         if _arguments: raise TypeError('No optional args expected')
-        if _no_object != None: raise TypeError('No direct arg expected')
+        if _no_object is not None: raise TypeError('No direct arg expected')
 
 
         _reply, _arguments, _attributes = self.send(_code, _subcode,
diff --git a/Lib/plat-mac/lib-scriptpackages/Netscape/Mozilla_suite.py b/Lib/plat-mac/lib-scriptpackages/Netscape/Mozilla_suite.py
index 21a28d8b770..89cb37f3fc2 100644
--- a/Lib/plat-mac/lib-scriptpackages/Netscape/Mozilla_suite.py
+++ b/Lib/plat-mac/lib-scriptpackages/Netscape/Mozilla_suite.py
@@ -21,7 +21,7 @@ class Mozilla_suite_Events:
         _subcode = 'Impt'
 
         if _arguments: raise TypeError('No optional args expected')
-        if _no_object != None: raise TypeError('No direct arg expected')
+        if _no_object is not None: raise TypeError('No direct arg expected')
 
 
         _reply, _arguments, _attributes = self.send(_code, _subcode,
@@ -41,7 +41,7 @@ class Mozilla_suite_Events:
         _subcode = 'upro'
 
         if _arguments: raise TypeError('No optional args expected')
-        if _no_object != None: raise TypeError('No direct arg expected')
+        if _no_object is not None: raise TypeError('No direct arg expected')
 
 
         _reply, _arguments, _attributes = self.send(_code, _subcode,
@@ -61,7 +61,7 @@ class Mozilla_suite_Events:
         _subcode = 'wurl'
 
         if _arguments: raise TypeError('No optional args expected')
-        if _no_object != None: raise TypeError('No direct arg expected')
+        if _no_object is not None: raise TypeError('No direct arg expected')
 
 
         _reply, _arguments, _attributes = self.send(_code, _subcode,
@@ -126,7 +126,7 @@ class Mozilla_suite_Events:
         _subcode = 'addr'
 
         if _arguments: raise TypeError('No optional args expected')
-        if _no_object != None: raise TypeError('No direct arg expected')
+        if _no_object is not None: raise TypeError('No direct arg expected')
 
 
         _reply, _arguments, _attributes = self.send(_code, _subcode,
@@ -165,7 +165,7 @@ class Mozilla_suite_Events:
         _subcode = 'prfl'
 
         if _arguments: raise TypeError('No optional args expected')
-        if _no_object != None: raise TypeError('No direct arg expected')
+        if _no_object is not None: raise TypeError('No direct arg expected')
 
 
         _reply, _arguments, _attributes = self.send(_code, _subcode,
diff --git a/Lib/plat-mac/lib-scriptpackages/Netscape/PowerPlant.py b/Lib/plat-mac/lib-scriptpackages/Netscape/PowerPlant.py
index a0c84b20fdc..a5dd2282b60 100644
--- a/Lib/plat-mac/lib-scriptpackages/Netscape/PowerPlant.py
+++ b/Lib/plat-mac/lib-scriptpackages/Netscape/PowerPlant.py
@@ -25,7 +25,7 @@ class PowerPlant_Events:
         _subcode = 'sttg'
 
         aetools.keysubst(_arguments, self._argmap_SwitchTellTarget)
-        if _no_object != None: raise TypeError('No direct arg expected')
+        if _no_object is not None: raise TypeError('No direct arg expected')
 
 
         _reply, _arguments, _attributes = self.send(_code, _subcode,
diff --git a/Lib/plat-mac/lib-scriptpackages/Netscape/Required_suite.py b/Lib/plat-mac/lib-scriptpackages/Netscape/Required_suite.py
index 8767ac367fc..a7d3e9629ab 100644
--- a/Lib/plat-mac/lib-scriptpackages/Netscape/Required_suite.py
+++ b/Lib/plat-mac/lib-scriptpackages/Netscape/Required_suite.py
@@ -61,7 +61,7 @@ class Required_suite_Events(Required_Suite_Events):
         _subcode = 'quit'
 
         if _arguments: raise TypeError('No optional args expected')
-        if _no_object != None: raise TypeError('No direct arg expected')
+        if _no_object is not None: raise TypeError('No direct arg expected')
 
 
         _reply, _arguments, _attributes = self.send(_code, _subcode,
@@ -80,7 +80,7 @@ class Required_suite_Events(Required_Suite_Events):
         _subcode = 'oapp'
 
         if _arguments: raise TypeError('No optional args expected')
-        if _no_object != None: raise TypeError('No direct arg expected')
+        if _no_object is not None: raise TypeError('No direct arg expected')
 
 
         _reply, _arguments, _attributes = self.send(_code, _subcode,
diff --git a/Lib/plat-mac/lib-scriptpackages/Netscape/WorldWideWeb_suite.py b/Lib/plat-mac/lib-scriptpackages/Netscape/WorldWideWeb_suite.py
index 2bfa2a589be..24a89e7133d 100644
--- a/Lib/plat-mac/lib-scriptpackages/Netscape/WorldWideWeb_suite.py
+++ b/Lib/plat-mac/lib-scriptpackages/Netscape/WorldWideWeb_suite.py
@@ -154,7 +154,7 @@ class WorldWideWeb_suite_Events:
         _subcode = 'LSTW'
 
         if _arguments: raise TypeError('No optional args expected')
-        if _no_object != None: raise TypeError('No direct arg expected')
+        if _no_object is not None: raise TypeError('No direct arg expected')
 
 
         _reply, _arguments, _attributes = self.send(_code, _subcode,
diff --git a/Lib/plat-mac/lib-scriptpackages/StdSuites/AppleScript_Suite.py b/Lib/plat-mac/lib-scriptpackages/StdSuites/AppleScript_Suite.py
index 5e710b90ef4..e5acd48c0eb 100644
--- a/Lib/plat-mac/lib-scriptpackages/StdSuites/AppleScript_Suite.py
+++ b/Lib/plat-mac/lib-scriptpackages/StdSuites/AppleScript_Suite.py
@@ -268,7 +268,7 @@ class AppleScript_Suite_Events:
         _subcode = 'actv'
 
         if _arguments: raise TypeError('No optional args expected')
-        if _no_object != None: raise TypeError('No direct arg expected')
+        if _no_object is not None: raise TypeError('No direct arg expected')
 
 
         _reply, _arguments, _attributes = self.send(_code, _subcode,
@@ -371,7 +371,7 @@ class AppleScript_Suite_Events:
         _subcode = 'tend'
 
         if _arguments: raise TypeError('No optional args expected')
-        if _no_object != None: raise TypeError('No direct arg expected')
+        if _no_object is not None: raise TypeError('No direct arg expected')
 
 
         _reply, _arguments, _attributes = self.send(_code, _subcode,
@@ -443,7 +443,7 @@ class AppleScript_Suite_Events:
         _subcode = 'idle'
 
         if _arguments: raise TypeError('No optional args expected')
-        if _no_object != None: raise TypeError('No direct arg expected')
+        if _no_object is not None: raise TypeError('No direct arg expected')
 
 
         _reply, _arguments, _attributes = self.send(_code, _subcode,
@@ -462,7 +462,7 @@ class AppleScript_Suite_Events:
         _subcode = 'noop'
 
         if _arguments: raise TypeError('No optional args expected')
-        if _no_object != None: raise TypeError('No direct arg expected')
+        if _no_object is not None: raise TypeError('No direct arg expected')
 
 
         _reply, _arguments, _attributes = self.send(_code, _subcode,
@@ -585,7 +585,7 @@ class AppleScript_Suite_Events:
         _subcode = 'log1'
 
         if _arguments: raise TypeError('No optional args expected')
-        if _no_object != None: raise TypeError('No direct arg expected')
+        if _no_object is not None: raise TypeError('No direct arg expected')
 
 
         _reply, _arguments, _attributes = self.send(_code, _subcode,
@@ -625,7 +625,8 @@ class AppleScript_Suite_Events:
         _subcode = 'log0'
 
         if _arguments: raise TypeError('No optional args expected')
-        if _no_object != None: raise TypeError('No direct arg expected')
+        if _no_object is not None: raise TypeError('No direct arg expected')
+
 
 
         _reply, _arguments, _attributes = self.send(_code, _subcode,
@@ -644,7 +645,7 @@ class AppleScript_Suite_Events:
         _subcode = 'tell'
 
         if _arguments: raise TypeError('No optional args expected')
-        if _no_object != None: raise TypeError('No direct arg expected')
+        if _no_object is not None: raise TypeError('No direct arg expected')
 
 
         _reply, _arguments, _attributes = self.send(_code, _subcode,
diff --git a/Lib/plat-mac/lib-scriptpackages/StdSuites/Standard_Suite.py b/Lib/plat-mac/lib-scriptpackages/StdSuites/Standard_Suite.py
index 187ea50c224..e30566809e7 100644
--- a/Lib/plat-mac/lib-scriptpackages/StdSuites/Standard_Suite.py
+++ b/Lib/plat-mac/lib-scriptpackages/StdSuites/Standard_Suite.py
@@ -255,7 +255,7 @@ class Standard_Suite_Events(builtin_Suite_Events):
         _subcode = 'crel'
 
         aetools.keysubst(_arguments, self._argmap_make)
-        if _no_object != None: raise TypeError('No direct arg expected')
+        if _no_object is not None: raise TypeError('No direct arg expected')
 
 
         _reply, _arguments, _attributes = self.send(_code, _subcode,
@@ -345,7 +345,7 @@ class Standard_Suite_Events(builtin_Suite_Events):
         _subcode = 'quit'
 
         aetools.keysubst(_arguments, self._argmap_quit)
-        if _no_object != None: raise TypeError('No direct arg expected')
+        if _no_object is not None: raise TypeError('No direct arg expected')
 
         aetools.enumsubst(_arguments, 'savo', _Enum_savo)
 
@@ -365,7 +365,7 @@ class Standard_Suite_Events(builtin_Suite_Events):
         _subcode = 'rapp'
 
         if _arguments: raise TypeError('No optional args expected')
-        if _no_object != None: raise TypeError('No direct arg expected')
+        if _no_object is not None: raise TypeError('No direct arg expected')
 
 
         _reply, _arguments, _attributes = self.send(_code, _subcode,
@@ -384,7 +384,7 @@ class Standard_Suite_Events(builtin_Suite_Events):
         _subcode = 'oapp'
 
         if _arguments: raise TypeError('No optional args expected')
-        if _no_object != None: raise TypeError('No direct arg expected')
+        if _no_object is not None: raise TypeError('No direct arg expected')
 
 
         _reply, _arguments, _attributes = self.send(_code, _subcode,
diff --git a/Lib/plat-mac/lib-scriptpackages/SystemEvents/Standard_Suite.py b/Lib/plat-mac/lib-scriptpackages/SystemEvents/Standard_Suite.py
index 5778288bb92..a0cd3dab63a 100644
--- a/Lib/plat-mac/lib-scriptpackages/SystemEvents/Standard_Suite.py
+++ b/Lib/plat-mac/lib-scriptpackages/SystemEvents/Standard_Suite.py
@@ -175,7 +175,7 @@ class Standard_Suite_Events:
         _subcode = 'crel'
 
         aetools.keysubst(_arguments, self._argmap_make)
-        if _no_object != None: raise TypeError('No direct arg expected')
+        if _no_object is not None: raise TypeError('No direct arg expected')
 
 
         _reply, _arguments, _attributes = self.send(_code, _subcode,
diff --git a/Lib/plat-mac/lib-scriptpackages/Terminal/Standard_Suite.py b/Lib/plat-mac/lib-scriptpackages/Terminal/Standard_Suite.py
index 61a27a824e4..0020e524594 100644
--- a/Lib/plat-mac/lib-scriptpackages/Terminal/Standard_Suite.py
+++ b/Lib/plat-mac/lib-scriptpackages/Terminal/Standard_Suite.py
@@ -175,7 +175,7 @@ class Standard_Suite_Events:
         _subcode = 'crel'
 
         aetools.keysubst(_arguments, self._argmap_make)
-        if _no_object != None: raise TypeError('No direct arg expected')
+        if _no_object is not None: raise TypeError('No direct arg expected')
 
 
         _reply, _arguments, _attributes = self.send(_code, _subcode,
diff --git a/Lib/plat-mac/lib-scriptpackages/_builtinSuites/builtin_Suite.py b/Lib/plat-mac/lib-scriptpackages/_builtinSuites/builtin_Suite.py
index 7d5abbd3542..a5ee8c60534 100644
--- a/Lib/plat-mac/lib-scriptpackages/_builtinSuites/builtin_Suite.py
+++ b/Lib/plat-mac/lib-scriptpackages/_builtinSuites/builtin_Suite.py
@@ -37,8 +37,7 @@ class builtin_Suite_Events:
         _subcode = 'oapp'
 
         if _arguments: raise TypeError('No optional args expected')
-        if _no_object != None: raise TypeError('No direct arg expected')
-
+        if _no_object is not None: raise TypeError('No direct arg expected')
 
         _reply, _arguments, _attributes = self.send(_code, _subcode,
                         _arguments, _attributes)
@@ -56,7 +55,7 @@ class builtin_Suite_Events:
         _subcode = 'rapp'
 
         if _arguments: raise TypeError('No optional args expected')
-        if _no_object != None: raise TypeError('No direct arg expected')
+        if _no_object is not None: raise TypeError('No direct arg expected')
 
 
         _reply, _arguments, _attributes = self.send(_code, _subcode,
@@ -100,7 +99,7 @@ class builtin_Suite_Events:
         _subcode = 'quit'
 
         aetools.keysubst(_arguments, self._argmap_quit)
-        if _no_object != None: raise TypeError('No direct arg expected')
+        if _no_object is not None: raise TypeError('No direct arg expected')
 
         aetools.enumsubst(_arguments, 'savo', _Enum_savo)
 
diff --git a/Lib/plat-mac/macostools.py b/Lib/plat-mac/macostools.py
index 80c372774b9..3d5b6f82419 100644
--- a/Lib/plat-mac/macostools.py
+++ b/Lib/plat-mac/macostools.py
@@ -106,7 +106,7 @@ def copy(src, dst, createpath=0, copydates=1, forcetype=None):
     sf = srcfss.FSpGetFInfo()
     df = dstfss.FSpGetFInfo()
     df.Creator, df.Type = sf.Creator, sf.Type
-    if forcetype != None:
+    if forcetype is not None:
         df.Type = forcetype
     df.Flags = (sf.Flags & COPY_FLAGS)
     dstfss.FSpSetFInfo(df)
diff --git a/Lib/plat-mac/videoreader.py b/Lib/plat-mac/videoreader.py
index 42954b7028c..50f9299ac2e 100644
--- a/Lib/plat-mac/videoreader.py
+++ b/Lib/plat-mac/videoreader.py
@@ -188,7 +188,7 @@ class _Reader:
 
     def GetVideoFrameRate(self):
         tv = self.videocurtime
-        if tv == None:
+        if tv is None:
             tv = 0
         flags = QuickTime.nextTimeStep|QuickTime.nextTimeEdgeOK
         tv, dur = self.videomedia.GetMediaNextInterestingTime(flags, tv, 1.0)
@@ -199,7 +199,7 @@ class _Reader:
         if not time is None:
             self.audiocurtime = time
         flags = QuickTime.nextTimeStep|QuickTime.nextTimeEdgeOK
-        if self.audiocurtime == None:
+        if self.audiocurtime is None:
             self.audiocurtime = 0
         tv = self.audiomedia.GetMediaNextInterestingTimeOnly(flags, self.audiocurtime, 1.0)
         if tv < 0 or (self.audiocurtime and tv < self.audiocurtime):
@@ -215,7 +215,7 @@ class _Reader:
         if not time is None:
             self.videocurtime = time
         flags = QuickTime.nextTimeStep
-        if self.videocurtime == None:
+        if self.videocurtime is None:
             flags = flags | QuickTime.nextTimeEdgeOK
             self.videocurtime = 0
         tv = self.videomedia.GetMediaNextInterestingTimeOnly(flags, self.videocurtime, 1.0)
diff --git a/Lib/plat-os2emx/grp.py b/Lib/plat-os2emx/grp.py
index 8ac9b15b46f..ee63ef8ae20 100644
--- a/Lib/plat-os2emx/grp.py
+++ b/Lib/plat-os2emx/grp.py
@@ -143,7 +143,7 @@ def __read_group_file():
     while 1:
         entry = group.readline().strip()
         if len(entry) > 3:
-            if sep == None:
+            if sep is None:
                 sep = __get_field_sep(entry)
             fields = entry.split(sep)
             fields[2] = int(fields[2])
diff --git a/Lib/plat-os2emx/pwd.py b/Lib/plat-os2emx/pwd.py
index e1739bdd072..2cb077f5abe 100644
--- a/Lib/plat-os2emx/pwd.py
+++ b/Lib/plat-os2emx/pwd.py
@@ -167,7 +167,7 @@ def __read_passwd_file():
     while True:
         entry = passwd.readline().strip()
         if len(entry) > 6:
-            if sep == None:
+            if sep is None:
                 sep = __get_field_sep(entry)
             fields = entry.split(sep)
             for i in (2, 3):
diff --git a/Lib/test/test_ast.py b/Lib/test/test_ast.py
index 68e5c88efa8..cd69ce1de72 100644
--- a/Lib/test/test_ast.py
+++ b/Lib/test/test_ast.py
@@ -124,7 +124,7 @@ if __name__=='__main__' and sys.argv[1:] == ['-g']:
 
 def test_order(ast_node, parent_pos):
 
-    if not isinstance(ast_node, _ast.AST) or ast_node._fields == None:
+    if not isinstance(ast_node, _ast.AST) or ast_node._fields is None:
         return
     if isinstance(ast_node, (_ast.expr, _ast.stmt, _ast.excepthandler)):
         node_pos = (ast_node.lineno, ast_node.col_offset)
@@ -135,7 +135,7 @@ def test_order(ast_node, parent_pos):
         if isinstance(value, list):
             for child in value:
                 test_order(child, parent_pos)
-        elif value != None:
+        elif value is not None:
             test_order(value, parent_pos)
 
 def run_tests():
diff --git a/Lib/test/test_logging.py b/Lib/test/test_logging.py
index ee9e392c67b..6f5af1573ef 100644
--- a/Lib/test/test_logging.py
+++ b/Lib/test/test_logging.py
@@ -450,6 +450,7 @@ class MemoryHandlerTest(BaseTest):
 
     def tearDown(self):
         self.mem_hdlr.close()
+        BaseTest.tearDown(self)
 
     def test_flush(self):
         # The memory handler flushes to its target handler based on specific
diff --git a/Lib/test/test_mailbox.py b/Lib/test/test_mailbox.py
index ca87229573b..bc77621088e 100644
--- a/Lib/test/test_mailbox.py
+++ b/Lib/test/test_mailbox.py
@@ -626,9 +626,9 @@ class TestMaildir(TestMailbox):
                                                                 "tmp")),
                              "File in wrong location: '%s'" % head)
             match = pattern.match(tail)
-            self.assert_(match != None, "Invalid file name: '%s'" % tail)
+            self.assert_(match is not None, "Invalid file name: '%s'" % tail)
             groups = match.groups()
-            if previous_groups != None:
+            if previous_groups is not None:
                 self.assert_(int(groups[0] >= previous_groups[0]),
                              "Non-monotonic seconds: '%s' before '%s'" %
                              (previous_groups[0], groups[0]))
diff --git a/Lib/test/test_pyclbr.py b/Lib/test/test_pyclbr.py
index c96ae6d046d..25c7d8503a1 100644
--- a/Lib/test/test_pyclbr.py
+++ b/Lib/test/test_pyclbr.py
@@ -55,7 +55,7 @@ class PyclbrTest(TestCase):
 
         ignore = set(ignore) | set(['object'])
 
-        if module == None:
+        if module is None:
             # Import it.
             # ('<silly>' is to work around an API silliness in __import__)
             module = __import__(moduleName, globals(), {}, ['<silly>'])
diff --git a/Lib/test/test_ssl.py b/Lib/test/test_ssl.py
index 4e9bfb36b15..0bd43920d18 100644
--- a/Lib/test/test_ssl.py
+++ b/Lib/test/test_ssl.py
@@ -670,7 +670,7 @@ else:
                           expectedToWork,
                           certsreqs=None):
 
-        if certsreqs == None:
+        if certsreqs is None:
             certsreqs = ssl.CERT_NONE
 
         if certsreqs == ssl.CERT_NONE:
diff --git a/Lib/xml/sax/expatreader.py b/Lib/xml/sax/expatreader.py
index c4fb93040db..26b05c3736d 100644
--- a/Lib/xml/sax/expatreader.py
+++ b/Lib/xml/sax/expatreader.py
@@ -107,7 +107,7 @@ class ExpatParser(xmlreader.IncrementalParser, xmlreader.Locator):
         xmlreader.IncrementalParser.parse(self, source)
 
     def prepareParser(self, source):
-        if source.getSystemId() != None:
+        if source.getSystemId() is not None:
             self._parser.SetBase(source.getSystemId())
 
     # Redefined setContentHandler to allow changing handlers during parsing
diff --git a/Mac/BuildScript/build-installer.py b/Mac/BuildScript/build-installer.py
index 0b62ea60162..6cf9c211773 100755
--- a/Mac/BuildScript/build-installer.py
+++ b/Mac/BuildScript/build-installer.py
@@ -289,7 +289,7 @@ def runCommand(commandline):
     fd = os.popen(commandline, 'r')
     data = fd.read()
     xit = fd.close()
-    if xit != None:
+    if xit is not None:
         sys.stdout.write(data)
         raise RuntimeError("command failed: %s"%(commandline,))
 
@@ -300,7 +300,7 @@ def captureCommand(commandline):
     fd = os.popen(commandline, 'r')
     data = fd.read()
     xit = fd.close()
-    if xit != None:
+    if xit is not None:
         sys.stdout.write(data)
         raise RuntimeError("command failed: %s"%(commandline,))
 
diff --git a/Mac/Demo/applescript/Disk_Copy/Utility_Events.py b/Mac/Demo/applescript/Disk_Copy/Utility_Events.py
index 03df9387a36..92133452c3d 100644
--- a/Mac/Demo/applescript/Disk_Copy/Utility_Events.py
+++ b/Mac/Demo/applescript/Disk_Copy/Utility_Events.py
@@ -26,7 +26,7 @@ class Utility_Events_Events:
         _subcode = 'SEL1'
 
         aetools.keysubst(_arguments, self._argmap_select_disk_image)
-        if _no_object != None: raise TypeError('No direct arg expected')
+        if _no_object is not None: raise TypeError('No direct arg expected')y
 
         aetools.enumsubst(_arguments, 'SELp', _Enum_TEXT)
 
@@ -52,8 +52,7 @@ class Utility_Events_Events:
         _subcode = 'SEL2'
 
         aetools.keysubst(_arguments, self._argmap_select_DiskScript)
-        if _no_object != None: raise TypeError('No direct arg expected')
-
+        if _no_object is not None: raise TypeError('No direct arg expected')
         aetools.enumsubst(_arguments, 'SELp', _Enum_TEXT)
 
         _reply, _arguments, _attributes = self.send(_code, _subcode,
@@ -78,7 +77,7 @@ class Utility_Events_Events:
         _subcode = 'SEL3'
 
         aetools.keysubst(_arguments, self._argmap_select_disk_image_or_DiskScript)
-        if _no_object != None: raise TypeError('No direct arg expected')
+        if _no_object is not None: raise TypeError('No direct arg expected')
 
         aetools.enumsubst(_arguments, 'SELp', _Enum_TEXT)
 
@@ -104,7 +103,7 @@ class Utility_Events_Events:
         _subcode = 'SEL4'
 
         aetools.keysubst(_arguments, self._argmap_select_floppy_disk_image)
-        if _no_object != None: raise TypeError('No direct arg expected')
+        if _no_object is not None: raise TypeError('No direct arg expected')
 
         aetools.enumsubst(_arguments, 'SELp', _Enum_TEXT)
 
@@ -130,7 +129,7 @@ class Utility_Events_Events:
         _subcode = 'SEL5'
 
         aetools.keysubst(_arguments, self._argmap_select_disk)
-        if _no_object != None: raise TypeError('No direct arg expected')
+        if _no_object is not None: raise TypeError('No direct arg expected')
 
         aetools.enumsubst(_arguments, 'SELp', _Enum_TEXT)
 
@@ -156,7 +155,7 @@ class Utility_Events_Events:
         _subcode = 'SEL6'
 
         aetools.keysubst(_arguments, self._argmap_select_folder)
-        if _no_object != None: raise TypeError('No direct arg expected')
+        if _no_object is not None: raise TypeError('No direct arg expected')
 
         aetools.enumsubst(_arguments, 'SELp', _Enum_TEXT)
 
diff --git a/Mac/Tools/Doc/HelpIndexingTool/Standard_Suite.py b/Mac/Tools/Doc/HelpIndexingTool/Standard_Suite.py
index 140e8b98fd2..7f0b63a3bb8 100644
--- a/Mac/Tools/Doc/HelpIndexingTool/Standard_Suite.py
+++ b/Mac/Tools/Doc/HelpIndexingTool/Standard_Suite.py
@@ -103,7 +103,7 @@ class Standard_Suite_Events(Standard_Suite_Events):
         _subcode = 'crel'
 
         aetools.keysubst(_arguments, self._argmap_make)
-        if _no_object != None: raise TypeError('No direct arg expected')
+        if _no_object is not None: raise TypeError('No direct arg expected')
 
 
         _reply, _arguments, _attributes = self.send(_code, _subcode,
diff --git a/Mac/Tools/Doc/setup.py b/Mac/Tools/Doc/setup.py
index e1d8fb18913..b020b405f9f 100644
--- a/Mac/Tools/Doc/setup.py
+++ b/Mac/Tools/Doc/setup.py
@@ -174,10 +174,10 @@ class AHVDocInstall(Command):
                 ('root', 'root'))
 #               import pdb ; pdb.set_trace()
         build_cmd = self.get_finalized_command('build')
-        if self.build_dest == None:
+        if self.build_dest is None:
             build_cmd = self.get_finalized_command('build')
             self.build_dest = build_cmd.build_dest
-        if self.install_doc == None:
+        if self.install_doc is None:
             self.install_doc = os.path.join(self.prefix, DESTDIR)
         print('INSTALL', self.build_dest, '->', self.install_doc)
 
diff --git a/Mac/scripts/buildpkg.py b/Mac/scripts/buildpkg.py
index ad0afe46c54..c5925881e06 100644
--- a/Mac/scripts/buildpkg.py
+++ b/Mac/scripts/buildpkg.py
@@ -183,7 +183,7 @@ class PackageMaker:
 
         # set folder attributes
         self.sourceFolder = root
-        if resources == None:
+        if resources is None:
             self.resourceFolder = root
         else:
             self.resourceFolder = resources
diff --git a/README b/README
index ecc0bea559e..41e8a8d9603 100644
--- a/README
+++ b/README
@@ -37,6 +37,14 @@ Documentation for Python 3000 is online, updated twice a day:
 
     http://docs.python.org/dev/3.0/
 
+All documentation is also available online at the Python web site
+(http://docs.python.org/, see below).  It is available online for occasional
+reference, or can be downloaded in many formats for faster access.  The
+documentation is downloadable in HTML, PostScript, PDF, LaTeX (through 2.5), and
+reStructuredText (2.6+) formats; the LaTeX and reStructuredText versions are
+primarily for documentation authors, translators, and people with special
+formatting requirements.
+
 This is a work in progress; please help improve it!
 
 The design documents for Python 3000 are also online.  While the
@@ -77,6 +85,12 @@ For a more detailed change log, read Misc/NEWS (though this file, too,
 is incomplete, and also doesn't list anything merged in from the 2.6
 release under development).
 
+Proposals for enhancement
+------------------------------
+
+If you have a proposal to change Python, it's best to submit a Python
+Enhancement Proposal (PEP) first.  All current PEPs, as well as guidelines for
+submitting a new PEP, are listed at http://www.python.org/dev/peps/.
 
 Converting From Python 2.x to 3.0
 ---------------------------------
diff --git a/Tools/bgen/bgen/bgenGenerator.py b/Tools/bgen/bgen/bgenGenerator.py
index f554fe21604..d55b4a4bb16 100644
--- a/Tools/bgen/bgen/bgenGenerator.py
+++ b/Tools/bgen/bgen/bgenGenerator.py
@@ -148,7 +148,7 @@ class FunctionGenerator(BaseFunctionGenerator):
         for arg in self.argumentList:
             if arg.flags == ErrorMode or arg.flags == SelfMode:
                 continue
-            if arg.type == None:
+            if arg.type is None:
                 str = 'void'
             else:
                 if hasattr(arg.type, 'typeName'):