make json.dumps serialise common things. Doh.

json_dumps_serialiser_that_should_be_default.py

# from stack overflow http://stackoverflow.com/questions/8230315/python-sets-are-not-json-serializable and others

class SerialiseThis(json.JSONEncoder):
    def default(self, obj):
    
        if isinstance(obj, set):
            return list(obj)
          
        if isinstance(obj, datetime.datetime):
            return obj.isoformat()
          
        return json.JSONEncoder.default(self, obj)
       
  
   
 
json.dumps(set([1,2,3,4,5,Something()]), cls=SerialseThis)