in MessagePayload.py [0:0]
def _prepare_message(self, d):
[ d.pop(k) for k in (set(self.preDropKeys) & set(d.keys())) ]
self.payload = d.copy()
self.make_message(d)
[ self.payload.pop(k) for k in (set(self.postDropKeys) & set(self.payload.keys())) ]