fix SyntaxWarning

product/ERP5/Document/Resource.py

@@ -111,7 +111,7 @@ class Resource(XMLObject, XMLMatrix, VariatedMixin):
                     |  morphology/2        | (colour/blue, colour/red, size/Man, size/Woman, morphology/2)
         """
         result = []
-        if base_category_list is ():
+        if base_category_list == ():
           base_category_list = self.getVariationBaseCategoryList(
               omit_individual_variation=omit_individual_variation)
         elif isinstance(base_category_list, str):
@@ -127,7 +127,7 @@ class Resource(XMLObject, XMLMatrix, VariatedMixin):
         if not omit_individual_variation:
           for variation in individual_variation_list:
             for base_category in variation.getVariationBaseCategoryList():
-              if base_category_list is ()\
+              if base_category_list == ()\
                   or base_category in base_category_list:
                 other_base_category_set.discard(base_category)
                 # XXX now, call Renderer a lot of time.
@@ -196,7 +196,7 @@ class Resource(XMLObject, XMLMatrix, VariatedMixin):
           for base_category in variation.getVariationBaseCategoryList():
             # backwards compatbility: if individual_bc_list is empty, allow
             # all individual variation base categories.
-            if (base_category_list is ()
+            if (base_category_list == ()
                 or base_category in base_category_list)\
                and (not len(individual_bc_list)
                     or base_category in individual_bc_list):

product/ERP5/bootstrap/erp5_core/SkinTemplateItem/portal_skins/erp5_core/Base_validateRelation.py

@@ -77,7 +77,7 @@ try:
     if checkFieldType(my_field, 'MultiRelationStringField'):
       # The checkProperty sometimes does not provide an
       # acceptable value - XXXX - see vetement_id in Modele View
-      if old_value is '' or old_value is None:
+      if old_value == '' or old_value is None:
         old_value = []
       try:
         old_value = list(old_value)

product/ERP5Type/Accessor/Translation.py

@@ -138,7 +138,7 @@ class PropertyTranslationDomainGetter(BaseGetter):
           ptype_domain = ''
         else:
           ptype_domain = domain.getDomainName()
-      if ptype_domain is '' and default is not None:
+      if ptype_domain == '' and default is not None:
         # then get the default property defined on property sheet
         value = default
       else:

product/ERP5Type/Base.py

@@ -1014,10 +1014,10 @@ class Base(
               result = None
             else:
               if isinstance(value, (list, tuple)):
-                if len(value) is 0:
-                  result = None
-                else:
+                if len(value):
                   result = value[0]
+                else:
+                  result = None
               else:
                 result = value
           else:
@@ -1048,10 +1048,10 @@ class Base(
             result = None
           else:
             if isinstance(value, (list, tuple)):
-              if len(value) is 0:
-                result = None
-              else:
+              if len(value):
                 result = value[0]
+              else:
+                result = None
             else:
               result = value
         else:
@@ -1092,10 +1092,10 @@ class Base(
             result = None
           else:
             if isinstance(value, (list, tuple)):
-              if len(value) is 0:
-                result = None
-              else:
+              if len(value):
                 result = value[0]
+              else:
+                result = None
             else:
               result = value
         else:

product/ERP5Type/Core/ContentExistenceConstraint.py

@@ -76,7 +76,7 @@ class ContentExistenceConstraint(ConstraintMixin):
 
     # Otherwise, generate an error message
     mapping = {}
-    if portal_type is ():
+    if not portal_type:
       message_id = 'message_no_subobject'
     else:
       message_id = 'message_no_subobject_portal_type'

product/ERP5Type/XMLExportImport/ppml.py

@@ -898,7 +898,7 @@ def save_bytes(self, tag, data):
     v = b''.join(data[2:])
     encoding = a.get('encoding', 'repr')
     assert encoding == 'base64'
-    if encoding is not '':
+    if encoding != '':
         v = unconvert(encoding, v)
     if self.binary:
         l = len(v)
@@ -922,7 +922,7 @@ def save_unicode(self, tag, data):
         for x in data[2:]:
             v=v+x
     encoding=a.get('encoding','repr') # JPS: repr is default encoding
-    if encoding is not '':
+    if encoding != '':
         v=unconvert(encoding,v)
     if binary:
         l=len(v)