human
I wrote the below code

    def fail_decode(_):
        raise Exception()
    def read():
        s = mock.Mock()
        s.decode = fail_decode
        return s
    m = mock.Mock()
    m.read = read
    return m

What's a good function header?

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

def mock_url_open_decode_fail(_):