当我从php运行它时，python scrapy回调不会发生

Question

当我从php代码运行它时，Python scrapy回调不会发生。一切正常，但回调只是不去，不知道为什么。我正在使用以下代码，如果有人遇到这个问题，请告诉我这是什么问题。先谢谢！

我的代码：
腓：

exec("python mypythoncode.py $input", $my_output);

的Python：
mypythoncode.py

import sys  
from scrapy.crawler import CrawlerProcess, CrawlerRunner  
from scrapy.utils.project import get_project_settings  
from scrapy.utils.log import configure_logging  
from scrapy.settings import Settings  
from tutorial.spiders.MixSpider import MixSpider  
inputURL = sys.argv[1]  

crawler = CrawlerProcess(Settings())
crawler.crawl(MixSpider, inputURL=inputURL)
crawler.start() 

MixSpider.py

import scrapy
import string
from tutorial.items import DmozItem
from urlparse import urlparse
from scrapy.http.request import Request

class MixSpider(scrapy.Spider):
    name = 'spider'
    def __init__(self, *args, **kwargs):
        super(MixSpider, self).__init__(*args, **kwargs) 
        url = kwargs.get('inputURL')
        self.start_urls = [url]

    def parse(self, response):
        for slide in response.css('#all > div > div > div > div.slide'):
            title = slide.css('div > div.frame > address > a::text').extract()
            pro_link = slide.css('div > div.frame > address > a::attr(href)').extract()
            yield scrapy.Request(pro_link,meta={'pro_title' : title,'title_link' : pro_link},callback=self.parse_property)

    def parse_property(self, response):
        print "inside"