human
I wrote the below code

    def getter(self):
        if (len(self._items) > 1):
            raise ValueError('More    than    one    HSPFragment    objects    found    in    HSP')
        if (attr is None):
            return self._items[0]
        return getattr(self._items[0], attr)
    return property(fget=getter, doc=doc)

What's a good function header?

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

def singleitem(attr=None, doc=''):