def __repr__(self):
    repr_str = '<{0} {1}: {2}>'
    return repr_str.format(self.__class__.__name__, self.get_id(), self.filename)
def __repr__(self):
    repr_str = '<{0} {1}: {2}>'
    return repr_str.format(self.__class__.__name__, self.get_id(), self.filename)