def get_message(self):
        if self.message == []: return None
        else: return os.linesep.join(self.message)
Return the key to be used in external maps for this user mapping
dataset/ETHPy150Open jart/fabulous/fabulous/widget.py/ProgressBar.get_message--crossover with--dataset/ETHPy150Open perseas/Pyrseas/pyrseas/dbobject/foreign.py/UserMapping.extern_key