[core/events] Use __ for private variables

core/event.py

@@ -1,16 +1,16 @@
 
-callbacks = {}
+__callbacks = {}
 
 def register(event, callback, *args, **kwargs):
-    callbacks.setdefault(event, []).append(
+    __callbacks.setdefault(event, []).append(
         lambda: callback(*args, **kwargs)
     )
 
 def clear():
-    callbacks.clear()
+    __callbacks.clear()
 
 def trigger(event):
-    for callback in callbacks.get(event, []):
+    for callback in __callbacks.get(event, []):
         callback()
 
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