解读Scrapy回调函数callback传递参数的方式_python

yield Request(url=self.base_url + 'QueryInfo', headers=self.request_headers, method="POST", body=json.dumps(request_params), callback=self.page_query_schools, cb_kwargs=add_params)

add_params = {}
add_params['province_code'] = province_code
add_params['province_name'] = name
yield Request(url=self.base_url + 'QueryInfo', headers=self.request_headers, method="POST", body=json.dumps(request_params), callback=self.page_query_schools, cb_kwargs=add_params)
         
def page_query_schools(self, response, province_code, province_name):        
     # logic definition 

add_params = {}
add_params['data_item']['province_code'] = province_code
add_params['data_item']['province_name'] = name
yield Request(url=self.base_url + 'QueryInfo', headers=self.request_headers, method="POST", body=json.dumps(request_params), callback=self.page_query_schools, cb_kwargs=dict(data_hsh=add_params))
        
def page_query_schools(self, response, data_hsh):        
    # logic definition