PEP 8 cleaning

Conflicts:

	polymorphic/__init__.py
	polymorphic/polymorphic_model.py

polymorphic/__init__.py

@@ -6,16 +6,16 @@ Copyright:
 This code and affiliated files are (C) by Bert Constantin and individual contributors.
 Please see LICENSE and AUTHORS for more information.
 """
-
 from polymorphic_model import PolymorphicModel
 from manager import PolymorphicManager
 from query import PolymorphicQuerySet
 from query_translate import translate_polymorphic_Q_object
 from showfields import ShowFieldContent, ShowFieldType, ShowFieldTypeAndContent
-from showfields import ShowFields, ShowFieldTypes, ShowFieldsAndTypes # import old names for compatibility
+from showfields import ShowFields, ShowFieldTypes, ShowFieldsAndTypes  # import old names for compatibility
 
 
-VERSION = (1, 0 , 0, 'beta')
+VERSION = (1, 0, 0, 'beta')
+
 
 def get_version():
     version = '%s.%s' % VERSION[0:2]
@@ -23,4 +23,35 @@ def get_version():
         version += '.%s' % VERSION[2]
     if VERSION[3]:
         version += ' %s' % VERSION[3]
-    return version
+    return version
+
+
+# Proxied models need to have it's own ContentType
+
+
+from django.contrib.contenttypes.models import ContentTypeManager
+from django.utils.encoding import smart_unicode
+
+
+def get_for_proxied_model(self, model):
+    """
+    Returns the ContentType object for a given model, creating the
+    ContentType if necessary. Lookups are cached so that subsequent lookups
+    for the same model don't hit the database.
+    """
+    opts = model._meta
+    key = (opts.app_label, opts.object_name.lower())
+    try:
+        ct = self.__class__._cache[self.db][key]
+    except KeyError:
+        # Load or create the ContentType entry. The smart_unicode() is
+        # needed around opts.verbose_name_raw because name_raw might be a
+        # django.utils.functional.__proxy__ object.
+        ct, created = self.get_or_create(
+            app_label=opts.app_label,
+            model=opts.object_name.lower(),
+            defaults={'name': smart_unicode(opts.verbose_name_raw)},
+        )
+        self._add_to_cache(self.db, ct)
+    return ct
+ContentTypeManager.get_for_proxied_model = get_for_proxied_model

polymorphic/base.py

@@ -14,7 +14,7 @@ from query import PolymorphicQuerySet
 
 # PolymorphicQuerySet Q objects (and filter()) support these additional key words.
 # These are forbidden as field names (a descriptive exception is raised)
-POLYMORPHIC_SPECIAL_Q_KWORDS = [ 'instance_of', 'not_instance_of']
+POLYMORPHIC_SPECIAL_Q_KWORDS = ['instance_of', 'not_instance_of']
 
 
 ###################################################################################
@@ -79,8 +79,8 @@ class PolymorphicModelBase(ModelBase):
         # determine the name of the primary key field and store it into the class variable
         # polymorphic_primary_key_name (it is needed by query.py)
         for f in new_class._meta.fields:
-            if f.primary_key and type(f)!=models.OneToOneField:
+            if f.primary_key and type(f) != models.OneToOneField:
-                new_class.polymorphic_primary_key_name=f.name
+                new_class.polymorphic_primary_key_name = f.name
                 break
 
         return new_class
@@ -97,7 +97,7 @@ class PolymorphicModelBase(ModelBase):
             if not issubclass(base, models.Model):
                 continue
             if not getattr(base, 'polymorphic_model_marker', None):
-                continue # leave managers of non-polym. models alone
+                continue  # leave managers of non-polym. models alone
 
             for key, manager in base.__dict__.items():
                 if type(manager) == models.manager.ManagerDescriptor:
@@ -113,7 +113,7 @@ class PolymorphicModelBase(ModelBase):
                 if manager._inherited:
                     continue             # inherited managers (on the bases) have no significance, they are just copies
                 #print >>sys.stderr,'##',self.__name__, key
-                if isinstance(manager, PolymorphicManager): # validate any inherited polymorphic managers
+                if isinstance(manager, PolymorphicManager):  # validate any inherited polymorphic managers
                     self.validate_model_manager(manager, self.__name__, key)
                 add_managers.append((base.__name__, key, manager))
                 add_managers_keys.add(key)
@@ -148,7 +148,7 @@ class PolymorphicModelBase(ModelBase):
         do_app_label_workaround = (meta
                                     and model_module_name == 'polymorphic'
                                     and model_name == 'PolymorphicModel'
-                                    and getattr(meta, 'app_label', None) is None )
+                                    and getattr(meta, 'app_label', None) is None)
 
         if do_app_label_workaround:
             meta.app_label = 'poly_dummy_app_label'
@@ -162,7 +162,7 @@ class PolymorphicModelBase(ModelBase):
         for f in self._meta.fields:
             if f.name in POLYMORPHIC_SPECIAL_Q_KWORDS:
                 e = 'PolymorphicModel: "%s" - field name "%s" is not allowed in polymorphic models'
-                raise AssertionError(e % (self.__name__, f.name) )
+                raise AssertionError(e % (self.__name__, f.name))
 
     @classmethod
     def validate_model_manager(self, manager, model_name, manager_name):
@@ -192,9 +192,9 @@ class PolymorphicModelBase(ModelBase):
         _dumpdata_command_running = (sys.argv[1] == 'dumpdata')
 
     def __getattribute__(self, name):
-        if name=='_default_manager':
+        if name == '_default_manager':
             if self._dumpdata_command_running:
-                frm = inspect.stack()[1] # frm[1] is caller file name, frm[3] is caller function name
+                frm = inspect.stack()[1]  # frm[1] is caller file name, frm[3] is caller function name
                 if 'django/core/management/commands/dumpdata.py' in frm[1]:
                     return self.base_objects
                 #caller_mod_name = inspect.getmodule(frm[0]).__name__  # does not work with python 2.4

polymorphic/compatibility_tools.py

@@ -20,36 +20,43 @@ except:
                 raise TypeError('first argument must be callable')
             dict.__init__(self, *a, **kw)
             self.default_factory = default_factory
+
         def __getitem__(self, key):
             try:
                 return dict.__getitem__(self, key)
             except KeyError:
                 return self.__missing__(key)
+
         def __missing__(self, key):
             if self.default_factory is None:
                 raise KeyError(key)
             self[key] = value = self.default_factory()
             return value
+
         def __reduce__(self):
             if self.default_factory is None:
                 args = tuple()
             else:
                 args = self.default_factory,
             return type(self), args, None, None, self.items()
+
         def copy(self):
             return self.__copy__()
+
         def __copy__(self):
             return type(self)(self.default_factory, self)
+
         def __deepcopy__(self, memo):
             import copy
-            return type(self)(self.default_factory,
+            return type(self)(self.default_factory, copy.deepcopy(self.items()))
-                              copy.deepcopy(self.items()))
+
         def __repr__(self):
             return 'defaultdict(%s, %s)' % (self.default_factory, dict.__repr__(self))
 
 
-if getattr(str,'partition',None):
+if getattr(str, 'partition', None):
-    def compat_partition(s,sep): return s.partition(sep)
+    def compat_partition(s, sep):
+        return s.partition(sep)
 else:
     """ from:
     http://mail.python.org/pipermail/python-dev/2005-September/055962.html
@@ -82,4 +89,3 @@ else:
         assert ''.join(result) == s
         assert result[1] == '' or result[1] is sep
         return result
-

polymorphic/manager.py

@@ -37,4 +37,3 @@ class PolymorphicManager(models.Manager):
 
     def __unicode__(self):
         return u'%s (PolymorphicManager) using %s' % (self.__class__.__name__, self.queryset_class.__name__)
-

polymorphic/polymorphic_model.py

@@ -12,7 +12,7 @@ http://bitbucket.org/bconstantin/django_polymorphic
 
 Copyright:
 This code and affiliated files are (C) by Bert Constantin and individual contributors.
-Please see LICENSE and AUTHORS for more information. 
+Please see LICENSE and AUTHORS for more information.
 """
 
 from django.db import models
@@ -23,7 +23,7 @@ from base import PolymorphicModelBase
 from manager import PolymorphicManager
 from query_translate import translate_polymorphic_Q_object
 
- 
+
 ###################################################################################
 ### PolymorphicModel
 
@@ -31,18 +31,18 @@ class PolymorphicModel(models.Model):
     """
     Abstract base class that provides polymorphic behaviour
     for any model directly or indirectly derived from it.
-    
+
     For usage instructions & examples please see documentation.
-    
+
     PolymorphicModel declares one field for internal use (polymorphic_ctype)
     and provides a polymorphic manager as the default manager
     (and as 'objects').
-    
+
     PolymorphicModel overrides the save() and __init__ methods.
-    
+
     If your derived class overrides any of these methods as well, then you need
     to take care that you correctly call the method of the superclass, like:
-    
+
         super(YourClass,self).save(*args,**kwargs)
     """
     __metaclass__ = PolymorphicModelBase
@@ -57,23 +57,23 @@ class PolymorphicModel(models.Model):
         abstract = True
 
     # avoid ContentType related field accessor clash (an error emitted by model validation)
-    # we really should use both app_label and model name, but this is only possible since Django 1.2 
+    # we really should use both app_label and model name, but this is only possible since Django 1.2
     if django_VERSION[0] <= 1 and django_VERSION[1] <= 1:
         p_related_name_template = 'polymorphic_%(class)s_set'
     else:
         p_related_name_template = 'polymorphic_%(app_label)s.%(class)s_set'
     polymorphic_ctype = models.ForeignKey(ContentType, null=True, editable=False,
                                 related_name=p_related_name_template)
-    
+
     # some applications want to know the name of the fields that are added to its models
-    polymorphic_internal_model_fields = [ 'polymorphic_ctype' ]
+    polymorphic_internal_model_fields = ['polymorphic_ctype']
 
     objects = PolymorphicManager()
     base_objects = models.Manager()
 
     @classmethod
-    def translate_polymorphic_Q_object(self_class,q):
+    def translate_polymorphic_Q_object(self_class, q):
-        return translate_polymorphic_Q_object(self_class,q)
+        return translate_polymorphic_Q_object(self_class, q)
 
     def pre_save_polymorphic(self):
         """Normally not needed.
@@ -96,18 +96,18 @@ class PolymorphicModel(models.Model):
         """Normally not needed.
         If a non-polymorphic manager (like base_objects) has been used to
         retrieve objects, then the real class/type of these objects may be
-        determined using this method.""" 
+        determined using this method."""
         # the following line would be the easiest way to do this, but it produces sql queries
         #return self.polymorphic_ctype.model_class()
         # so we use the following version, which uses the CopntentType manager cache
         return ContentType.objects.get_for_id(self.polymorphic_ctype_id).model_class()
-    
+
     def get_real_instance(self):
         """Normally not needed.
         If a non-polymorphic manager (like base_objects) has been used to
         retrieve objects, then the complete object with it's real class/type
         and all fields may be retrieved with this method.
-        Each method call executes one db query (if necessary).""" 
+        Each method call executes one db query (if necessary)."""
         real_model = self.get_real_instance_class()
         if real_model == self.__class__:
             return self
@@ -147,11 +147,11 @@ class PolymorphicModel(models.Model):
         subclasses_and_superclasses_accessors = self._get_inheritance_relation_fields_and_models()
 
         from django.db.models.fields.related import SingleRelatedObjectDescriptor, ReverseSingleRelatedObjectDescriptor
-        for name,model in subclasses_and_superclasses_accessors.iteritems():
+        for name, model in subclasses_and_superclasses_accessors.iteritems():
             orig_accessor = getattr(self.__class__, name, None)
-            if type(orig_accessor) in [SingleRelatedObjectDescriptor,ReverseSingleRelatedObjectDescriptor]:
+            if type(orig_accessor) in [SingleRelatedObjectDescriptor, ReverseSingleRelatedObjectDescriptor]:
-                #print >>sys.stderr, '---------- replacing',name, orig_accessor
+                #print >>sys.stderr, '---------- replacing', name, orig_accessor, '->', model
-                setattr(self.__class__, name, property(create_accessor_function_for_model(model, name)) )
+                setattr(self.__class__, name, property(create_accessor_function_for_model(model, name)))
 
     def _get_inheritance_relation_fields_and_models(self):
         """helper function for __init__:
@@ -167,8 +167,8 @@ class PolymorphicModel(models.Model):
             if (issubclass(model, models.Model)
                 and model != models.Model
                 and model != self.__class__
-                and model != PolymorphicModel ):
+                and model != PolymorphicModel):
-                add_model(model,as_ptr,result)
+                add_model(model, as_ptr, result)
 
         def add_all_super_models(model, result):
             add_model_if_regular(model, True, result)
@@ -180,6 +180,6 @@ class PolymorphicModel(models.Model):
                 add_model_if_regular(b, False, result)
 
         result = {}
-        add_all_super_models(self.__class__,result)
+        add_all_super_models(self.__class__, result)
-        add_all_sub_models(self.__class__,result)
+        add_all_sub_models(self.__class__, result)
         return result

polymorphic/query.py

@@ -60,13 +60,13 @@ class PolymorphicQuerySet(QuerySet):
 
     def _filter_or_exclude(self, negate, *args, **kwargs):
         "We override this internal Django functon as it is used for all filter member functions."
-        translate_polymorphic_filter_definitions_in_args(self.model, args) # the Q objects
+        translate_polymorphic_filter_definitions_in_args(self.model, args)  # the Q objects
-        additional_args = translate_polymorphic_filter_definitions_in_kwargs(self.model, kwargs) # filter_field='data'
+        additional_args = translate_polymorphic_filter_definitions_in_kwargs(self.model, kwargs)  # filter_field='data'
         return super(PolymorphicQuerySet, self)._filter_or_exclude(negate, *(list(args) + additional_args), **kwargs)
 
     def order_by(self, *args, **kwargs):
         """translate the field paths in the args, then call vanilla order_by."""
-        new_args = [ translate_polymorphic_field_path(self.model, a) for a in args ]
+        new_args = [translate_polymorphic_field_path(self.model, a) for a in args]
         return super(PolymorphicQuerySet, self).order_by(*new_args, **kwargs)
 
     def _process_aggregate_args(self, args, kwargs):
@@ -170,12 +170,12 @@ class PolymorphicQuerySet(QuerySet):
         # Then we copy the extra() select fields from the base objects to the real objects.
         # TODO: defer(), only(): support for these would be around here
         for modelclass, idlist in idlist_per_model.items():
-            qs = modelclass.base_objects.filter(pk__in=idlist) # use pk__in instead ####
+            qs = modelclass.base_objects.filter(pk__in=idlist)  # use pk__in instead ####
-            qs.dup_select_related(self)    # copy select related configuration to new qs
+            qs.dup_select_related(self)  # copy select related configuration to new qs
 
             for o in qs:
-                o_pk=getattr(o,pk_name)
+                o_pk = getattr(o, pk_name)
-                
+
                 if self.query.aggregates:
                     for anno_field_name in self.query.aggregates.keys():
                         attr = getattr(base_result_objects_by_id[o_pk], anno_field_name)
@@ -189,20 +189,20 @@ class PolymorphicQuerySet(QuerySet):
                 results[o_pk] = o
 
         # re-create correct order and return result list
-        resultlist = [ results[ordered_id] for ordered_id in ordered_id_list if ordered_id in results ]
+        resultlist = [results[ordered_id] for ordered_id in ordered_id_list if ordered_id in results]
 
         # set polymorphic_annotate_names in all objects (currently just used for debugging/printing)
         if self.query.aggregates:
-            annotate_names=self.query.aggregates.keys() # get annotate field list
+            annotate_names = self.query.aggregates.keys()  # get annotate field list
             for o in resultlist:
-                o.polymorphic_annotate_names=annotate_names
+                o.polymorphic_annotate_names = annotate_names
 
         # set polymorphic_extra_select_names in all objects (currently just used for debugging/printing)
         if self.query.extra_select:
-            extra_select_names=self.query.extra_select.keys() # get extra select field list
+            extra_select_names = self.query.extra_select.keys()  # get extra select field list
             for o in resultlist:
-                o.polymorphic_extra_select_names=extra_select_names
+                o.polymorphic_extra_select_names = extra_select_names
-            
+
         return resultlist
 
     def iterator(self):
@@ -250,14 +250,14 @@ class PolymorphicQuerySet(QuerySet):
 
     def __repr__(self, *args, **kwargs):
         if self.model.polymorphic_query_multiline_output:
-            result = [ repr(o) for o in self.all() ]
+            result = [repr(o) for o in self.all()]
             return  '[ ' + ',\n  '.join(result) + ' ]'
         else:
-            return super(PolymorphicQuerySet,self).__repr__(*args, **kwargs)
+            return super(PolymorphicQuerySet, self).__repr__(*args, **kwargs)
 
     class _p_list_class(list):
         def __repr__(self, *args, **kwargs):
-            result = [ repr(o) for o in self ]
+            result = [repr(o) for o in self]
             return  '[ ' + ',\n  '.join(result) + ' ]'
 
     def get_real_instances(self, base_result_objects=None):

polymorphic/query_translate.py

@@ -47,6 +47,7 @@ def translate_polymorphic_filter_definitions_in_kwargs(queryset_model, kwargs):
 
     return additional_args
 
+
 def translate_polymorphic_Q_object(queryset_model, potential_q_object):
     def tree_node_correct_field_specs(my_model, node):
         " process all children of this Q node "
@@ -68,6 +69,7 @@ def translate_polymorphic_Q_object(queryset_model, potential_q_object):
 
     return potential_q_object
 
+
 def translate_polymorphic_filter_definitions_in_args(queryset_model, args):
     """
     Translate the non-keyword argument list for PolymorphicQuerySet.filter()
@@ -104,7 +106,7 @@ def _translate_polymorphic_filter_definition(queryset_model, field_path, field_v
     elif field_path == 'not_instance_of':
         return _create_model_filter_Q(field_val, not_instance_of=True)
     elif not '___' in field_path:
-        return None #no change
+        return None  # no change
 
     # filter expression contains '___' (i.e. filter for polymorphic field)
     # => get the model class specified in the filter expression
@@ -184,7 +186,7 @@ def translate_polymorphic_field_path(queryset_model, field_path):
         newpath = '-'
     else:
         newpath = ''
-    
+
     newpath += basepath
     if basepath:
         newpath += '__'
@@ -223,10 +225,9 @@ def _create_model_filter_Q(modellist, not_instance_of=False):
             q = q | q_class_with_subclasses(subclass)
         return q
 
-    qlist = [  q_class_with_subclasses(m)  for m in modellist  ]
+    qlist = [q_class_with_subclasses(m)  for m in modellist]
 
     q_ored = reduce(lambda a, b: a | b, qlist)
     if not_instance_of:
         q_ored = ~q_ored
     return q_ored
-

polymorphic/showfields.py

@@ -2,10 +2,11 @@
 
 from django.db import models
 
+
 class ShowFieldBase(object):
     """ base class for the ShowField... model mixins, does the work """
 
-    polymorphic_query_multiline_output = True # cause nicer multiline PolymorphicQuery output
+    polymorphic_query_multiline_output = True  # cause nicer multiline PolymorphicQuery output
 
     polymorphic_showfield_type = False
     polymorphic_showfield_content = False
@@ -32,14 +33,14 @@ class ShowFieldBase(object):
                 out += content.__class__.__name__
         elif issubclass(field_type, models.ManyToManyField):
             out += '%d' % content.count()
-        elif type(content) in (int,long):
+        elif type(content) in (int, long):
             out += unicode(content)
         elif content is None:
             out += 'None'
         else:
-            txt=unicode(content)
+            txt = unicode(content)
-            if len(txt)>self.polymorphic_showfield_max_field_width:
+            if len(txt) > self.polymorphic_showfield_max_field_width:
-                txt=txt[:self.polymorphic_showfield_max_field_width-2]+'..'
+                txt = txt[:self.polymorphic_showfield_max_field_width - 2] + '..'
             out += '"' + txt + '"'
         return out
 
@@ -50,14 +51,14 @@ class ShowFieldBase(object):
             if field.name in self.polymorphic_internal_model_fields or '_ptr' in field.name:
                 continue
             if field.name in done_fields:
-                continue # work around django diamond inheritance problem
+                continue  # work around django diamond inheritance problem
             done_fields.add(field.name)
-            
+
             out = field.name
 
             # if this is the standard primary key named "id", print it as we did with older versions of django_polymorphic
-            if field.primary_key and field.name=='id' and type(field)==models.AutoField:
+            if field.primary_key and field.name == 'id' and type(field) == models.AutoField:
-                out += ' '+ unicode(getattr(self, field.name))
+                out += ' ' + unicode(getattr(self, field.name))
 
             # otherwise, display it just like all other fields (with correct type, shortened content etc.)
             else:
@@ -68,13 +69,13 @@ class ShowFieldBase(object):
                     out += ')'
 
                 if self.polymorphic_showfield_content:
-                    out += self._showfields_get_content(field.name,type(field))
+                    out += self._showfields_get_content(field.name, type(field))
 
-            parts.append((False, out,','))
+            parts.append((False, out, ','))
 
     def _showfields_add_dynamic_fields(self, field_list, title, parts):
         "helper for __unicode__"
-        parts.append( ( True, '- '+title, ':' ) )
+        parts.append((True, '- ' + title, ':'))
         for field_name in field_list:
             out = field_name
             content = getattr(self, field_name)
@@ -83,67 +84,74 @@ class ShowFieldBase(object):
             if self.polymorphic_showfield_content:
                 out += self._showfields_get_content(field_name)
 
-            parts.append( ( False, out, ',' ) )
+            parts.append((False, out, ','))
 
     def __unicode__(self):
         # create list ("parts") containing one tuple for each title/field:
         # ( bool: new section , item-text , separator to use after item )
 
         # start with model name
-        parts = [ (True, self.__class__.__name__, ':') ]
+        parts = [(True, self.__class__.__name__, ':')]
 
         # add all regular fields
         self._showfields_add_regular_fields(parts)
 
         # add annotate fields
-        if hasattr(self,'polymorphic_annotate_names'):
+        if hasattr(self, 'polymorphic_annotate_names'):
             self._showfields_add_dynamic_fields(self.polymorphic_annotate_names, 'Ann', parts)
 
         # add extra() select fields
-        if hasattr(self,'polymorphic_extra_select_names'):
+        if hasattr(self, 'polymorphic_extra_select_names'):
             self._showfields_add_dynamic_fields(self.polymorphic_extra_select_names, 'Extra', parts)
 
         # format result
 
-        indent = len(self.__class__.__name__)+5
+        indent = len(self.__class__.__name__) + 5
         indentstr = ''.rjust(indent)
-        out=u''; xpos=0; possible_line_break_pos = None
+        out = u''
+        xpos = 0
+        possible_line_break_pos = None
 
         for i in xrange(len(parts)):
             new_section, p, separator = parts[i]
-            final = (i==len(parts)-1)
+            final = (i == len(parts) - 1)
             if not final:
-                next_new_section, _, _ = parts[i+1]
+                next_new_section, _, _ = parts[i + 1]
 
-            if ( self.polymorphic_showfield_max_line_width
+            if (self.polymorphic_showfield_max_line_width
-                and xpos+len(p) > self.polymorphic_showfield_max_line_width
+                and xpos + len(p) > self.polymorphic_showfield_max_line_width
-                and possible_line_break_pos!=None ):
+                and possible_line_break_pos != None):
                 rest = out[possible_line_break_pos:]
                 out = out[:possible_line_break_pos]
-                out+= '\n'+indentstr+rest
+                out += '\n' + indentstr + rest
-                xpos=indent+len(rest)
+                xpos = indent + len(rest)
 
-            out += p; xpos += len(p)
+            out += p
+            xpos += len(p)
 
             if not final:
                 if not next_new_section:
-                    out += separator; xpos += len(separator)
+                    out += separator
-                out += ' '; xpos += 1
+                    xpos += len(separator)
+                out += ' '
+                xpos += 1
 
             if not new_section:
-                possible_line_break_pos=len(out)
+                possible_line_break_pos = len(out)
 
-        return u'<'+out+'>'
+        return u'<' + out + '>'
 
 
 class ShowFieldType(ShowFieldBase):
     """ model mixin that shows the object's class and it's field types """
     polymorphic_showfield_type = True
 
+
 class ShowFieldContent(ShowFieldBase):
     """ model mixin that shows the object's class, it's fields and field contents """
     polymorphic_showfield_content = True
 
+
 class ShowFieldTypeAndContent(ShowFieldBase):
     """ model mixin, like ShowFieldContent, but also show field types """
     polymorphic_showfield_type = True

polymorphic/tools_for_tests.py

@@ -4,15 +4,15 @@
 
 import uuid
 
-from django.forms.util import ValidationError
 from django import forms
 from django.db import models
 from django.utils.encoding import smart_unicode
-from django.utils.translation import ugettext_lazy
+
 
 class UUIDVersionError(Exception):
     pass
 
+
 class UUIDField(models.CharField):
     """Encode and stores a Python uuid.UUID in a manner that is appropriate
     for the given datatabase that we are using.
@@ -60,24 +60,24 @@ class UUIDField(models.CharField):
 
         self.auto = auto
         self.version = version
-        if version==1:
+        if version == 1:
             self.node, self.clock_seq = node, clock_seq
-        elif version==3 or version==5:
+        elif version == 3 or version == 5:
             self.namespace, self.name = namespace, name
 
         super(UUIDField, self).__init__(verbose_name=verbose_name,
             name=name, **kwargs)
 
     def create_uuid(self):
-        if not self.version or self.version==4:
+        if not self.version or self.version == 4:
             return uuid.uuid4()
-        elif self.version==1:
+        elif self.version == 1:
             return uuid.uuid1(self.node, self.clock_seq)
-        elif self.version==2:
+        elif self.version == 2:
             raise UUIDVersionError("UUID version 2 is not supported.")
-        elif self.version==3:
+        elif self.version == 3:
             return uuid.uuid3(self.namespace, self.name)
-        elif self.version==5:
+        elif self.version == 5:
             return uuid.uuid5(self.namespace, self.name)
         else:
             raise UUIDVersionError("UUID version %s is not valid." % self.version)
@@ -116,7 +116,7 @@ class UUIDField(models.CharField):
             value = self.create_uuid()
             setattr(model_instance, self.attname, value)
         else:
-            value = super(UUIDField, self).pre_save(model_instance,add)
+            value = super(UUIDField, self).pre_save(model_instance, add)
             if self.auto and not value:
                 value = self.create_uuid()
                 setattr(model_instance, self.attname, value)