Use with_metaclass from future.utils for python3 compat.

evennia/utils/ansi.py

@@ -16,6 +16,7 @@ user.
 import re
 from evennia.utils import utils
 from evennia.utils.utils import to_str, to_unicode
+from future.utils import with_metaclass
 
 # ANSI definitions
 
@@ -555,7 +556,7 @@ class ANSIMeta(type):
         super(ANSIMeta, cls).__init__(*args, **kwargs)
 
 
-class ANSIString(unicode):
+class ANSIString(with_metaclass(ANSIMeta, unicode)):
     """
     String-like object that is aware of ANSI codes.
 
@@ -572,7 +573,6 @@ class ANSIString(unicode):
     for several of the methods that need not be defined directly here.
 
     """
-    __metaclass__ = ANSIMeta
 
     def __new__(cls, *args, **kwargs):
         """

evennia/utils/idmapper/models.py

@@ -21,6 +21,7 @@ from evennia.utils import logger
 from evennia.utils.utils import dbref, get_evennia_pids, to_str
 
 from .manager import SharedMemoryManager
+from future.utils import with_metaclass
 
 AUTO_FLUSH_MIN_INTERVAL = 60.0 * 5 # at least 5 mins between cache flushes
 
@@ -200,13 +201,10 @@ class SharedMemoryModelBase(ModelBase):
         return super(SharedMemoryModelBase, cls).__new__(cls, name, bases, attrs)
 
 
-class SharedMemoryModel(Model):
+class SharedMemoryModel(with_metaclass(SharedMemoryModelBase, Model)):
     """
     Base class for idmapped objects. Inherit from `this`.
     """
-    # CL: setting abstract correctly to allow subclasses to inherit the default
-    # manager.
-    __metaclass__ = SharedMemoryModelBase
 
     objects = SharedMemoryManager()
 
@@ -415,12 +413,11 @@ class WeakSharedMemoryModelBase(SharedMemoryModelBase):
         cls._idmapper_recache_protection = False
 
 
-class WeakSharedMemoryModel(SharedMemoryModel):
+class WeakSharedMemoryModel(with_metaclass(WeakSharedMemoryModelBase, SharedMemoryModel)):
     """
     Uses a WeakValue dictionary for caching instead of a regular one
 
     """
-    __metaclass__ = WeakSharedMemoryModelBase
     class Meta:
         abstract = True
 

evennia/utils/picklefield.py

@@ -44,6 +44,7 @@ from django.forms.util import flatatt
 from django.utils.html import format_html
 
 from evennia.utils.dbserialize import from_pickle, to_pickle
+from future.utils import with_metaclass
 
 try:
     from django.utils.encoding import force_text
@@ -167,7 +168,7 @@ class PickledFormField(CharField):
             raise ValidationError(self.error_messages['invalid'])
 
 
-class PickledObjectField(_get_subfield_superclass()):
+class PickledObjectField(with_metaclass(models.SubfieldBase, _get_subfield_superclass())):
     """
     A field that will accept *any* python object and store it in the
     database. PickledObjectField will optionally compress its values if
@@ -177,7 +178,6 @@ class PickledObjectField(_get_subfield_superclass()):
     can still do lookups using None). This way, it is still possible to
     use the ``isnull`` lookup type correctly.
     """
-    __metaclass__ = models.SubfieldBase  # for django < 1.3
 
     def __init__(self, *args, **kwargs):
         self.compress = kwargs.pop('compress', False)