human
Here's a good function header given the following:
I wrote the below code

    def getter(self):
        self._ensure_file()
        if (field_name == 'length'):
            return self._file.get(field_name, 0)
        return self._file.get(field_name, None)
    docstring += '\n\nThis    attribute    is    read-only.'
    return property(getter, doc=docstring)

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

def _grid_out_property(field_name, docstring):