Fixed #18013 -- Use the new 'as' syntax for exceptions.

Thanks Clueless for the initial patch.
Note that unittest has been purposely left out (external package only used by Python 2.6).

django/forms/fields.py

@@ -132,7 +132,7 @@ class Field(object):
         for v in self.validators:
             try:
                 v(value)
-            except ValidationError, e:
+            except ValidationError as e:
                 if hasattr(e, 'code') and e.code in self.error_messages:
                     message = self.error_messages[e.code]
                     if e.params:
@@ -884,7 +884,7 @@ class MultiValueField(Field):
                 raise ValidationError(self.error_messages['required'])
             try:
                 clean_data.append(field.clean(field_value))
-            except ValidationError, e:
+            except ValidationError as e:
                 # Collect all validation errors in a single list, which we'll
                 # raise at the end of clean(), rather than raising a single
                 # exception for the first error we encounter.

django/forms/forms.py

@@ -289,7 +289,7 @@ class BaseForm(StrAndUnicode):
                 if hasattr(self, 'clean_%s' % name):
                     value = getattr(self, 'clean_%s' % name)()
                     self.cleaned_data[name] = value
-            except ValidationError, e:
+            except ValidationError as e:
                 self._errors[name] = self.error_class(e.messages)
                 if name in self.cleaned_data:
                     del self.cleaned_data[name]
@@ -297,7 +297,7 @@ class BaseForm(StrAndUnicode):
     def _clean_form(self):
         try:
             self.cleaned_data = self.clean()
-        except ValidationError, e:
+        except ValidationError as e:
             self._errors[NON_FIELD_ERRORS] = self.error_class(e.messages)
 
     def _post_clean(self):

django/forms/formsets.py

@@ -291,7 +291,7 @@ class BaseFormSet(StrAndUnicode):
         # Give self.clean() a chance to do cross-form validation.
         try:
             self.clean()
-        except ValidationError, e:
+        except ValidationError as e:
             self._non_form_errors = self.error_class(e.messages)
 
     def clean(self):

django/forms/models.py

@@ -324,13 +324,13 @@ class BaseModelForm(BaseForm):
         # Clean the model instance's fields.
         try:
             self.instance.clean_fields(exclude=exclude)
-        except ValidationError, e:
+        except ValidationError as e:
             self._update_errors(e.message_dict)
 
         # Call the model instance's clean method.
         try:
             self.instance.clean()
-        except ValidationError, e:
+        except ValidationError as e:
             self._update_errors({NON_FIELD_ERRORS: e.messages})
 
         # Validate uniqueness if needed.
@@ -345,7 +345,7 @@ class BaseModelForm(BaseForm):
         exclude = self._get_validation_exclusions()
         try:
             self.instance.validate_unique(exclude=exclude)
-        except ValidationError, e:
+        except ValidationError as e:
             self._update_errors(e.message_dict)
 
     def save(self, commit=True):

django/forms/util.py

@@ -66,7 +66,7 @@ def from_current_timezone(value):
         current_timezone = timezone.get_current_timezone()
         try:
             return timezone.make_aware(value, current_timezone)
-        except Exception, e:
+        except Exception:
             raise ValidationError(_('%(datetime)s couldn\'t be interpreted '
                                     'in time zone %(current_timezone)s; it '
                                     'may be ambiguous or it may not exist.')