diff -r 0037199881fb -r cf2304af0fab src/pyams_utils/intids.py
--- a/src/pyams_utils/intids.py	Wed Nov 20 19:26:23 2019 +0100
+++ b/src/pyams_utils/intids.py	Fri Nov 22 18:51:37 2019 +0100
@@ -10,26 +10,29 @@
 # FOR A PARTICULAR PURPOSE.
 #
 
-__docformat__ = 'restructuredtext'
-
+"""PyAMS_utils.intids module
 
-# import standard packages
+This module provides utility functions and helpers to help usage of IIntIds utilities.
+Pyramid events subscribers are also declared to match Zope events with Pyramid IntIds related
+events
+"""
 
-# import interfaces
 from persistent.interfaces import IPersistent
-from pyams_utils.interfaces.intids import IUniqueID
-from zope.intid.interfaces import IIntIds, IIntIdEvent, IntIdAddedEvent, IntIdRemovedEvent
-from zope.lifecycleevent.interfaces import IObjectAddedEvent, IObjectRemovedEvent
-from zope.location.interfaces import ISublocations
-from zope.keyreference.interfaces import IKeyReference, NotYet
-
-# import packages
-from pyams_utils.adapter import adapter_config, ContextAdapter
-from pyams_utils.registry import get_all_utilities_registered_for, query_utility
 from pyramid.events import subscriber
 from pyramid.threadlocal import get_current_registry
 from zope.intid import intIdEventNotify
+from zope.intid.interfaces import IIntIdEvent, IIntIds, IntIdAddedEvent, IntIdRemovedEvent
+from zope.keyreference.interfaces import IKeyReference, NotYet
 from zope.lifecycleevent import ObjectRemovedEvent
+from zope.lifecycleevent.interfaces import IObjectAddedEvent, IObjectRemovedEvent
+from zope.location.interfaces import ISublocations
+
+from pyams_utils.adapter import ContextAdapter, adapter_config
+from pyams_utils.interfaces.intids import IUniqueID
+from pyams_utils.registry import get_all_utilities_registered_for, query_utility
+
+
+__docformat__ = 'restructuredtext'
 
 
 @adapter_config(context=IPersistent, provides=IUniqueID)
@@ -46,6 +49,7 @@
         intids = query_utility(IIntIds)
         if intids is not None:
             return hex(intids.queryId(self.context))[2:]
+        return None
 
 
 @subscriber(IObjectAddedEvent, context_selector=IPersistent)
@@ -82,7 +86,7 @@
     registry = get_current_registry()
     locations = ISublocations(event.object, None)
     if locations is not None:
-        for location in locations.sublocations():
+        for location in locations.sublocations():  # pylint: disable=too-many-function-args
             registry.notify(ObjectRemovedEvent(location))
     utilities = tuple(get_all_utilities_registered_for(IIntIds))
     if utilities:
@@ -100,7 +104,9 @@
 
 @subscriber(IIntIdEvent)
 def handle_intid_event(event):
-    """Event subscriber used to dispatch all IIntIdEvent events using Pyramid events subscribers to matching
-    subscribers using Zope events
+    """IntId event subscriber
+
+    This event is used to dispatch all IIntIdEvent events using Pyramid events subscribers
+    to matching subscribers using Zope events
     """
     intIdEventNotify(event)