'Query or sets the default value of the specified option(s) in
style.
Each key in kw is an option and each value is either a string or
a sequence identifying the value for that option.'

def configure(self, style, query_opt=None, **kw):

    if (query_opt is not None):
        kw[query_opt] = None
    return _val_or_dict(kw, self.tk.call, self._name, 'configure', style)
