我正在努力追随本教程 http://doc.scrapy.org/en/1.1/intro/tutorial.html.
我想要我的desc
字段是标准化为单个空格且大写的单个字符串。
dmoz_spider.py
import scrapy
from tutorial.items import DmozItem
class DmozSpider(scrapy.Spider):
name = "dmoz"
allowed_domains = ["dmoz.org"]
start_urls = [
"http://www.dmoz.org/Computers/Programming/Languages/Python/Books/",
"http://www.dmoz.org/Computers/Programming/Languages/Python/Resources/"
]
def parse(self, response):
for sel in response.xpath('//ul/li'):
item = DmozItem()
item['title'] = sel.xpath('a/text()').extract()
item['link'] = sel.xpath('a/@href').extract()
item['desc'] = sel.xpath('text()').extract()
yield item
我尝试根据声明声明输入/输出处理器http://doc.scrapy.org/en/latest/topics/loaders.html#declaring-input-and-output-processors http://doc.scrapy.org/en/latest/topics/loaders.html#declaring-input-and-output-processors
items.py
import scrapy
from scrapy.loader.processors import MapCompose, Join
class DmozItem(scrapy.Item):
title = scrapy.Field()
link = scrapy.Field()
desc = scrapy.Field(
input_processor=MapCompose(
lambda x: ' '.join(x.split()),
lambda x: x.upper()
),
output_processor=Join()
)
然而,我的输出结果仍然是这样。
{'desc': ['\r\n\t\r\n ',
' \r\n'
'\t\t\t\r\n'
' - By David Mertz; Addison Wesley. '
'Book in progress, full text, ASCII format. Asks for feedback. '
'[author website, Gnosis Software, Inc.]\r\n'
' \r\n'
' ',
'\r\n '],
'link': ['http://gnosis.cx/TPiP/'],
'title': ['Text Processing in Python']}
我究竟做错了什么?
我正在使用 Python 3.5.1 和 Scrapy 1.1.0
我把我的整个代码放在这里:https://github.com/prashcr/scrapy_tutorial https://github.com/prashcr/scrapy_tutorial,以便您可以尝试并根据需要进行修改。