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

    @wraps(f)
    def new_f(widget, data, *args, **kwargs):
        widget.Error.add_message('download_sql_data', _download_sql_data)
        widget.Error.download_sql_data.clear()
        if isinstance(data, SqlTable):
            if (data.approx_len() < AUTO_DL_LIMIT):
                data = Table(data)
            else:
                widget.Error.download_sql_data()
                data = None
        return f(widget, data, *args, **kwargs)
    return new_f

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

def check_sql_input(f):