Find what base class an attributes is coming from in Python

gistfile1.py

def find_attribute_class(model, attribute):
    """
    If the attribute is found, it returns an array of places the attribute is defined.
    The array is ordered by priority, the first element being the one that is called.
    If not found, returns an empty array.
    """
    return [m for m in model.mro() if attribute in m.__dict__]