diff --git a/openerp/addons/base/ir/ir_ui_menu.py b/openerp/addons/base/ir/ir_ui_menu.py
index 72d01f326b2..2eb17d91fc1 100644
--- a/openerp/addons/base/ir/ir_ui_menu.py
+++ b/openerp/addons/base/ir/ir_ui_menu.py
@@ -144,7 +144,7 @@ class ir_ui_menu(osv.osv):
         return res
 
     def _get_full_name(self, cr, uid, ids, name=None, args=None, context=None):
-        if context == None:
+        if context is None:
             context = {}
         res = {}
         for elmt in self.browse(cr, uid, ids, context=context):
diff --git a/openerp/osv/orm.py b/openerp/osv/orm.py
index 1968e4b0864..07cf4364f6c 100644
--- a/openerp/osv/orm.py
+++ b/openerp/osv/orm.py
@@ -2675,7 +2675,7 @@ class BaseModel(object):
         groupby = group_by
         for r in cr.dictfetchall():
             for fld, val in r.items():
-                if val == None: r[fld] = False
+                if val is None: r[fld] = False
             alldata[r['id']] = r
             del r['id']
 
@@ -3584,7 +3584,7 @@ class BaseModel(object):
             context = {}
         if not ids:
             return []
-        if fields_to_read == None:
+        if fields_to_read is None:
             fields_to_read = self._columns.keys()
 
         # Construct a clause for the security rules.
diff --git a/openerp/report/custom.py b/openerp/report/custom.py
index 596d9a9f1b9..0c572c0c249 100644
--- a/openerp/report/custom.py
+++ b/openerp/report/custom.py
@@ -96,7 +96,7 @@ class report_custom(report_int):
             else:
                 # Process group_by data first
                 key = []
-                if group_by != None and fields[group_by] != None:
+                if group_by is not None and fields[group_by] is not None:
                     if fields[group_by][0] in levels.keys():
                         key.append(fields[group_by][0])
                     for l in levels.keys():
@@ -212,7 +212,7 @@ class report_custom(report_int):
         new_res = []
 
         prev = None
-        if groupby != None:
+        if groupby is not None:
             res_dic = {}
             for line in results:
                 if not line[groupby] and prev in res_dic:
@@ -322,7 +322,7 @@ class report_custom(report_int):
                     col.attrib.update(para='yes',
                                       tree='yes',
                                       space=str(3*shift)+'mm')
-                if line[f] != None:
+                if line[f] is not None:
                     col.text = prefix+str(line[f]) or ''
                 else:
                     col.text = '/'
@@ -381,7 +381,7 @@ class report_custom(report_int):
         # plots are usually displayed year by year
         # so we do so if the first field is a date
         data_by_year = {}
-        if date_idx != None:
+        if date_idx is not None:
             for r in results:
                 key = process_date['Y'](r[date_idx])
                 if key not in data_by_year:
@@ -480,7 +480,7 @@ class report_custom(report_int):
         # plot are usually displayed year by year
         # so we do so if the first field is a date
         data_by_year = {}
-        if date_idx != None:
+        if date_idx is not None:
             for r in results:
                 key = process_date['Y'](r[date_idx])
                 if key not in data_by_year:
@@ -602,7 +602,7 @@ class report_custom(report_int):
             node_line = etree.SubElement(lines, 'row')
             for f in range(len(fields)):
                 col = etree.SubElement(node_line, 'col', tree='no')
-                if line[f] != None:
+                if line[f] is not None:
                     col.text = line[f] or ''
                 else:
                     col.text = '/'
diff --git a/openerp/report/printscreen/ps_form.py b/openerp/report/printscreen/ps_form.py
index cf6d77cbe26..c3735df2850 100644
--- a/openerp/report/printscreen/ps_form.py
+++ b/openerp/report/printscreen/ps_form.py
@@ -119,7 +119,7 @@ class report_printscreen_list(report_int):
                     precision=(('digits' in fields[f]) and fields[f]['digits'][1]) or 2
                     line[f]=round(line[f],precision)
                 col = etree.SubElement(node_line, 'col', tree='no')
-                if line[f] != None:
+                if line[f] is not None:
                     col.text = tools.ustr(line[f] or '')
                 else:
                     col.text = '/'
diff --git a/openerp/report/printscreen/ps_list.py b/openerp/report/printscreen/ps_list.py
index 8f0629462f8..8908577e6ac 100644
--- a/openerp/report/printscreen/ps_list.py
+++ b/openerp/report/printscreen/ps_list.py
@@ -230,7 +230,7 @@ class report_printscreen_list(report_int):
                     col.text = line[f] = 'Undefined'
                     col.set('tree', 'undefined')
 
-                if line[f] != None:
+                if line[f] is not None:
                     col.text = tools.ustr(line[f] or '')
                     if float_flag:
                         col.set('tree','float')
@@ -245,7 +245,7 @@ class report_printscreen_list(report_int):
         for f in range(0, len(fields_order)):
             col = etree.SubElement(node_line, 'col', para='group', tree='no')
             col.set('tree', 'float')
-            if tsum[f] != None:
+            if tsum[f] is not None:
                 if tsum[f] != 0.0:
                     digits = fields[fields_order[f]].get('digits', (16, 2))
                     prec = '%%.%sf' % (digits[1], )
diff --git a/openerp/report/pyPdf/generic.py b/openerp/report/pyPdf/generic.py
index aaf503180f8..0edb432a69a 100644
--- a/openerp/report/pyPdf/generic.py
+++ b/openerp/report/pyPdf/generic.py
@@ -81,7 +81,7 @@ def readObject(stream, pdf):
             return NumberObject.readFromStream(stream)
         peek = stream.read(20)
         stream.seek(-len(peek), 1) # reset to start
-        if re.match(r"(\d+)\s(\d+)\sR[^a-zA-Z]", peek) != None:
+        if re.match(r"(\d+)\s(\d+)\sR[^a-zA-Z]", peek) is not None:
             return IndirectObject.readFromStream(stream, pdf)
         else:
             return NumberObject.readFromStream(stream)
@@ -169,7 +169,7 @@ class IndirectObject(PdfObject):
 
     def __eq__(self, other):
         return (
-            other != None and
+            other is not None and
             isinstance(other, IndirectObject) and
             self.idnum == other.idnum and
             self.generation == other.generation and
@@ -489,7 +489,7 @@ class DictionaryObject(dict, PdfObject):
     # return None if no metadata was found on the document root.
     def getXmpMetadata(self):
         metadata = self.get("/Metadata", None)
-        if metadata == None:
+        if metadata is None:
             return None
         metadata = metadata.getObject()
         import xmp
diff --git a/openerp/report/pyPdf/pdf.py b/openerp/report/pyPdf/pdf.py
index 53c0b428c14..9c4f31c4e41 100644
--- a/openerp/report/pyPdf/pdf.py
+++ b/openerp/report/pyPdf/pdf.py
@@ -197,7 +197,7 @@ class PdfFileWriter(object):
     # flag is on.
     def encrypt(self, user_pwd, owner_pwd = None, use_128bit = True):
         import time, random
-        if owner_pwd == None:
+        if owner_pwd is None:
             owner_pwd = user_pwd
         if use_128bit:
             V = 2
@@ -251,7 +251,7 @@ class PdfFileWriter(object):
         # copying in a new copy of the page object.
         for objIndex in xrange(len(self._objects)):
             obj = self._objects[objIndex]
-            if isinstance(obj, PageObject) and obj.indirectRef != None:
+            if isinstance(obj, PageObject) and obj.indirectRef is not None:
                 data = obj.indirectRef
                 if not externalReferenceMap.has_key(data.pdf):
                     externalReferenceMap[data.pdf] = {}
@@ -340,7 +340,7 @@ class PdfFileWriter(object):
                     return data
             else:
                 newobj = externMap.get(data.pdf, {}).get(data.generation, {}).get(data.idnum, None)
-                if newobj == None:
+                if newobj is None:
                     newobj = data.pdf.getObject(data)
                     self._objects.append(None) # placeholder
                     idnum = len(self._objects)
@@ -426,7 +426,7 @@ class PdfFileReader(object):
     # Stability: Added in v1.0, will exist for all v1.x releases.
     # @return Returns an integer.
     def getNumPages(self):
-        if self.flattenedPages == None:
+        if self.flattenedPages is None:
             self._flatten()
         return len(self.flattenedPages)
 
@@ -445,7 +445,7 @@ class PdfFileReader(object):
     def getPage(self, pageNumber):
         ## ensure that we're not trying to access an encrypted PDF
         #assert not self.trailer.has_key("/Encrypt")
-        if self.flattenedPages == None:
+        if self.flattenedPages is None:
             self._flatten()
         return self.flattenedPages[pageNumber]
 
@@ -465,7 +465,7 @@ class PdfFileReader(object):
     # @return Returns a dict which maps names to {@link #Destination
     # destinations}.
     def getNamedDestinations(self, tree=None, retval=None):
-        if retval == None:
+        if retval is None:
             retval = {}
             catalog = self.trailer["/Root"]
             
@@ -477,7 +477,7 @@ class PdfFileReader(object):
                 if names.has_key("/Dests"):
                     tree = names['/Dests']
         
-        if tree == None:
+        if tree is None:
             return retval
 
         if tree.has_key("/Kids"):
@@ -493,7 +493,7 @@ class PdfFileReader(object):
                 if isinstance(val, DictionaryObject) and val.has_key('/D'):
                     val = val['/D']
                 dest = self._buildDestination(key, val)
-                if dest != None:
+                if dest is not None:
                     retval[key] = dest
 
         return retval
@@ -511,7 +511,7 @@ class PdfFileReader(object):
     # Stability: Added in v1.10, will exist for all future v1.x releases.
     # @return Returns a nested list of {@link #Destination destinations}.
     def getOutlines(self, node=None, outlines=None):
-        if outlines == None:
+        if outlines is None:
             outlines = []
             catalog = self.trailer["/Root"]
             
@@ -522,7 +522,7 @@ class PdfFileReader(object):
                     node = lines["/First"]
             self._namedDests = self.getNamedDestinations()
             
-        if node == None:
+        if node is None:
           return outlines
           
         # see if there are any more outlines
@@ -588,9 +588,9 @@ class PdfFileReader(object):
             NameObject("/Resources"), NameObject("/MediaBox"),
             NameObject("/CropBox"), NameObject("/Rotate")
             )
-        if inherit == None:
+        if inherit is None:
             inherit = dict()
-        if pages == None:
+        if pages is None:
             self.flattenedPages = []
             catalog = self.trailer["/Root"].getObject()
             pages = catalog["/Pages"].getObject()
@@ -616,7 +616,7 @@ class PdfFileReader(object):
 
     def getObject(self, indirectReference):
         retval = self.resolvedObjects.get(indirectReference.generation, {}).get(indirectReference.idnum, None)
-        if retval != None:
+        if retval is not None:
             return retval
         if indirectReference.generation == 0 and \
            self.xref_objStm.has_key(indirectReference.idnum):
@@ -959,10 +959,10 @@ def getRectangle(self, name, defaults):
     retval = self.get(name)
     if isinstance(retval, RectangleObject):
         return retval
-    if retval == None:
+    if retval is None:
         for d in defaults:
             retval = self.get(d)
-            if retval != None:
+            if retval is not None:
                 break
     if isinstance(retval, IndirectObject):
         retval = self.pdf.getObject(retval)
diff --git a/openerp/report/pyPdf/xmp.py b/openerp/report/pyPdf/xmp.py
index 0813b806d45..1b49fd7b2b7 100644
--- a/openerp/report/pyPdf/xmp.py
+++ b/openerp/report/pyPdf/xmp.py
@@ -66,7 +66,7 @@ class XmpInformation(PdfObject):
         for desc in self.rdfRoot.getElementsByTagNameNS(RDF_NAMESPACE, "Description"):
             if desc.getAttributeNS(RDF_NAMESPACE, "about") == aboutUri:
                 attr = desc.getAttributeNodeNS(namespace, name)
-                if attr != None:
+                if attr is not None:
                     yield attr
                 for element in desc.getElementsByTagNameNS(namespace, name):
                     yield element
@@ -187,7 +187,7 @@ class XmpInformation(PdfObject):
                 else:
                     value = self._getText(element)
                 break
-            if value != None:
+            if value is not None:
                 value = converter(value)
             ns_cache = self.cache.setdefault(namespace, {})
             ns_cache[name] = value
@@ -353,5 +353,5 @@ class XmpInformation(PdfObject):
     custom_properties = property(custom_properties)
 
 
-
-# vim:expandtab:smartindent:tabstop=4:softtabstop=4:shiftwidth=4:
+
+# vim:expandtab:smartindent:tabstop=4:softtabstop=4:shiftwidth=4:
diff --git a/openerp/report/render/rml2pdf/color.py b/openerp/report/render/rml2pdf/color.py
index 69ef56003b1..35dd9637376 100644
--- a/openerp/report/render/rml2pdf/color.py
+++ b/openerp/report/render/rml2pdf/color.py
@@ -28,7 +28,7 @@ regex_t = re.compile('\(([0-9\.]*),([0-9\.]*),([0-9\.]*)\)')
 regex_h = re.compile('#([0-9a-zA-Z][0-9a-zA-Z])([0-9a-zA-Z][0-9a-zA-Z])([0-9a-zA-Z][0-9a-zA-Z])')
 
 def get(col_str):
-    if col_str == None:
+    if col_str is None:
         col_str = ''
     global allcols
     if col_str in allcols.keys():
diff --git a/openerp/report/render/rml2txt/rml2txt.py b/openerp/report/render/rml2txt/rml2txt.py
index ab1930d81ba..b431904f9c8 100755
--- a/openerp/report/render/rml2txt/rml2txt.py
+++ b/openerp/report/render/rml2txt/rml2txt.py
@@ -220,7 +220,7 @@ class _flowable(object):
     def rec_render(self,node):
         """ Recursive render: fill outarr with text of current node
         """
-        if node.tag != None:
+        if node.tag is not None:
             if node.tag in self._tags:
                 self._tags[node.tag](node)
             else:
diff --git a/openerp/tools/lru.py b/openerp/tools/lru.py
index 5e84775a352..13b76f387b7 100644
--- a/openerp/tools/lru.py
+++ b/openerp/tools/lru.py
@@ -77,7 +77,7 @@ class LRU(object):
     @synchronized()
     def __iter__(self):
         cur = self.first
-        while cur != None:
+        while cur is not None:
             cur2 = cur.next
             yield cur.me[1]
             cur = cur2
@@ -89,7 +89,7 @@ class LRU(object):
     @synchronized()
     def iteritems(self):
         cur = self.first
-        while cur != None:
+        while cur is not None:
             cur2 = cur.next
             yield cur.me
             cur = cur2