def parse_final(self,response):
#我去，这个Final_Xpath竟然只会传递一次......你要是动了这个Final_Xpath，那就无法修改回来了
Final_Xpath = response.meta.get('Final_Xpath',None)
Some_Info = response.meta.get('Some_Info',None)
if 'All_Xpath' not in Final_Xpath.keys():
item = NettvSpiderItem()
l = ItemLoader(item=item, response=response)
for key in Final_Xpath.keys():
item.fields[key] = Field()
try:
#itemloader在add_xxx方法找不到值的时候，会自动忽略这个字段，可是我不想忽略它，这时候需要将其置为空("")
if map(lambda x:1 if x else 0, map(lambda x:response.xpath(x).extract() if x != "/" else "",Final_Xpath[key])) in [[0,0],[0]] and key != "site_name":
map(lambda x:l.add_value(key , ""),["just_one"])
elif key == "site_name":
map(lambda x:l.add_value(key , x),Final_Xpath[key])
else:
map(lambda x:l.add_xpath(key , x) if response.xpath(x).extract() != [] else "",Final_Xpath[key])
except Exception,e:
print Exception,":",e
if Some_Info:
for key in Some_Info.keys():
item.fields[key] = Field()
l.add_value(key , Some_Info[key])
yield l.load_item()
except Exception,e:
print Exception,":",e
if Some_Info:
for key in Some_Info.keys():
item.fields[key] = Field()
l.add_value(key , Some_Info[key])
yield l.load_item()
else:
#感觉这里不能用itemloader的add_xxx方法了，因为要先找到一个页面所有的含有目标item的块，再在每个块里面提取出单个item，itemloader的话是一次性直接全取出，add_xpath不能再细分了;;打算用add_value方法
my_Final_Xpath = Final_Xpath.copy()
All_Xpath = my_Final_Xpath['All_Xpath'].copy()
del my_Final_Xpath['All_Xpath']
all_xpath = All_Xpath['all_xpath']
del All_Xpath['all_xpath']
for i in response.xpath(all_xpath[0]):
item = NettvSpiderItem()
l = ItemLoader(item=item, response=response)
#把All_Xpath中的数据提取出来
for key in All_Xpath.keys():
item.fields[key] = Field()
try:
#itemloader在add_xxx方法找不到值的时候，会自动忽略这个字段，可是我不想忽略它，这时候需要将其置为空("")
if map(lambda x:1 if x else 0, map(lambda x:response.xpath(x).extract() if x != "/" else "",Final_Xpath[key])) in [[0,0],[0]]:
map(lambda x:l.add_value(key , ""),["just_one"])
else:
map(lambda x:l.add_value(key, i.xpath(x).extract()) if i.xpath(x).extract() != [] else "",Final_Xpath[key])
except Exception,e:
print Exception,",",e
#将除了All_Xpath中的数据提取出来，像豆瓣就特别需要这种情况，一般下面的数据是（多次取得），All_Xpath中才是真正单条的数据
for key in my_Final_Xpath.keys():
item.fields[key] = Field()