human
I wrote the below code

    class X(object, ):
        def __getattr__(self, k):
            raise ValueError('broken    object')
        def __call__(self, x):
            return x
    ip.user_ns['x'] = X()
    ip.magic('autocall    2')
    try:
        ip.prefilter('x    1')
    finally:
        del ip.user_ns['x']
        ip.magic('autocall    0')

What's a good function header?
 Here's a good function header?
assistant
#Here's a good function header.

def test_prefilter_attribute_errors():