def _yaml_f(self, data, style='', flow=None, start=True):
    return yaml.dump(data, default_style=style, explicit_start=start, default_flow_style=flow)
def _yaml_f(self, data, style=, flow=None, start=True):
    return yaml.dump(data, default_style=style, explicit_start=start, default_flow_style=flow)