python scrapy解码方法和时间格式转换

import scrapy
from datetime import datetime

class BianSpider(scrapy.Spider):
    name = 'bian'
    # allowed_domains = ['www']
    start_urls = ['http://tech.163.com/special/00097UHL/tech_datalist.js?callback=data_callback']

    def parse(self, response):
        # print(response.body.decode('gbk'))
        import json
    ---《for i in json.loads(response.body.decode('gbk').strip('data_callback(').strip(')')):》---
            print(i['title'])
            print(i['label'])
            time_list = i['time']
       ---《print(datetime.strptime(time_list,'%m/%d/%Y %H:%M:%S'))》---
            print(','.join([ii['keyname'] for ii in i['keywords']]))
            desc_href = i['docurl']
            yield scrapy.Request(desc_href,self.show)

    def show(self,response):
        # print(response.xpath('//div[3]/div[2]/div[1]/div[1]//text()'))
        types = response.xpath("string(//div[@class='post_crumb'])").extract_first().strip()
        weizhi = ' '.join(response.xpath("//div[@class='post_crumb']//text()").extract()).strip()

        print(weizhi)
        print(response.xpath('//*[@id="ne_article_source"]/text()').extract())
        print(response.xpath('//*[@id="endText"]/div[2]/span[2]/text()').extract())