Python 3.6, 3.9 and Django 3.0 compatibility

localized_fields/fields/bleach_field.py

@@ -1,7 +1,4 @@
-import bleach
-
 from django.conf import settings
-from django_bleach.utils import get_bleach_default_options
 
 from .field import LocalizedField
 
@@ -22,6 +19,20 @@ class LocalizedBleachField(LocalizedField):
                 to the database or an update.
         """
 
+        # the bleach library vendors dependencies and the html5lib
+        # dependency is incompatible with python 3.9, until that's
+        # fixed, you cannot use LocalizedBleachField with python 3.9
+        # sympton:
+        #   ImportError: cannot import name 'Mapping' from 'collections'
+        try:
+            import bleach
+
+            from django_bleach.utils import get_bleach_default_options
+        except ImportError:
+            raise UserWarning(
+                "LocalizedBleachField is not compatible with Python 3.9 yet."
+            )
+
         localized_value = getattr(instance, self.attname)
         if not localized_value:
             return None