scrapy spider 不能输出到 pipeline 里

不知道为什么，注释了这一段就能输出到 pipeline

代码内容其实就是先进一个 url ，获得 cookie ，再带着 cookie 访问，把验证码下下来解析，然后再把数据 post 上去，要是验证码错了，就重复下验证码再解析，再 post ，直到 post 成功。 bug 代码在最后，重复下载验证码的部分，各位熟悉 scrapy 的大牛知道为什么吗？

# -*- coding: gbk -*-
import scrapy
from scrapy.http import FormRequest
import json
import os
from datetime import datetime
from scrapy.selector import Selector
from teacherCourse.handlePic import handle
from teacherCourse.items import DetailProfItem
from teacherCourse.items import DetailProfCourseItem
from teacherCourse.items import containItem

class GetTeacherCourseSpider(scrapy.Spider):
    name = 'TeacherCourse'
#    custom_settings = {
#            'ITEM_PIPELINES': {
#                'teacherCourse.pipelines.TeacherCoursePipeline': 300,
#                }
#            }

    def __init__(self, selXNXQ='', titleCode=''):
        self.getUrl = 'http://jwxt.dgut.edu.cn/jwweb/ZNPK/TeacherKBFB.aspx' # first
        self.vcodeUrl = 'http://jwxt.dgut.edu.cn/jwweb/sys/ValidateCode.aspx' # second
        self.postUrl = 'http://jwxt.dgut.edu.cn/jwweb/ZNPK/TeacherKBFB_rpt.aspx' # third
        self.findSessionId = None # to save the cookies
        self.XNXQ = selXNXQ
        self.titleCode = titleCode

    def start_requests(self):
        request = scrapy.Request(self.getUrl,
               callback = self.downloadPic)
        yield request

    def downloadPic(self, response):
        # download the picture
        # find the session id
        self.findSessionId = response.headers.getlist('Set-Cookie')[0].decode().split(";")[0].split("=")
        request = scrapy.Request(self.vcodeUrl,
                cookies= {self.findSessionId[0]: self.findSessionId[1]},
                callback = self.getAndHandleYzm)
        yield request
    
    def getAndHandleYzm(self, response):
        yzm = handle(response.body)
        
        yield FormRequest(self.postUrl,
                formdata={'Sel_XNXQ': '20151',
                          'sel_zc': '011',
                          'txt_yzm': yzm,
                          'type': '2'},
                headers={
                    'Referer': 'http://jwxt.dgut.edu.cn/jwweb/ZNPK/TeacherKBFB.aspx',
                    'Cookie': self.findSessionId[0] + '=' + self.findSessionId[1],
                    },


                callback=self.parse)

    def parse(self, response):
        body = response.body.decode('gbk')
# bug code begin
        num = body.find('alert')
        if num != -1:
            # means CAPTCHA validation fails, need to re-request the CAPTCHA
            yield scrapy.Request(self.vcodeUrl+'?t='+'%.f' % (datetime.now().microsecond / 1000),
            headers={
                    'Referer': 'http://jwxt.dgut.edu.cn/jwweb/ZNPK/TeacherKBFB.aspx',
                    'Cookie': self.findSessionId[0]+'='+self.findSessionId[1]
                    },
            callback=self.getAndHandleYzm) # re request the url to solve the validation code fail problem
# bug code done
        else:
            # parse data
#            self.parseData(body)
            item = containItem()
            item['first'] = len(body)
            return item