kwargs.setdefault

In[1]:kwargs={'name':'Lilei'} In[2]:item=kwargs.setdefault('name','zhangsan')#取到对应的键值 item->

def set_default_headers(self):print("我是set_default_headers")#返回错误信息 def write_error(self,

Default None•obj_set INST:Objective set,Default None•con_set INST:Constraints args,*kwargs)Set

'hello')self.add_header('age',10)def get(self,*args,*kwargs):self.write('set_default_headers')

tornado服务器若干方法的调用def set_default_headers(self):print('set_default_headers方法执行')#响应以

on_delete,to_field=None,*kwargs)on_delete=models.SET_DEFAULT,default='默认值')on_delete=models.SET_

class IndexHandler(tornado.web.RequestHandler):def set_default_headers(self):print("执行了set_

spec_set,autospec,new_callable,kwargs):if new_callable is not None:if new is not DEFAULT:raise

3.set_default_headers() 4.set_status(status_code,reason=None) 6.send_error(status_code=500,*kwargs)

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