Is there a stock function to test if an object attribute is a relationship? 
I have created below function to test it, is there a better solution?

def is_relationship(obj, attr):
    try:
        p = inspect(getattr(type(obj), attr)).property
    except (AttributeError, NoInspectionAvailable):
        return False
    if isinstance(p, RelationshipProperty):
        return True
    return False


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SQLAlchemy - 
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