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スクラップの画像パイプラインを使用して画像を取得する際に問題があります。エラーレポートから、私はScrapyに正しいimage_urlsを供給していると思います。しかし、Scrapyはそれらから画像をダウンロードするのではなく、次のエラーを返します。ValueError：要求に含まれていないスキームurl：h。スクラップで画像を取得する際の値エラー
これは画像パイプライン機能を初めて使用したので、私は簡単な間違いをしていると思われます。すべて同じですが、私はそれを解決するために感謝したいと思います。
以下に私のスパイダー、設定、アイテム、およびエラー出力があります。彼らはかなりMWEではありませんが、私は彼らが非常にシンプルで、同じことをすべて理解しやすいと思います。
スパイダー：scrapy.spidersから 輸入scrapy scrapy.linkextractorsからCrawlSpider、ルール をインポートngamedallions.itemsからLinkExtractor インポートがscrapy.loader.processorsからNgamedallionsItem をインポートから ItemLoader scrapy.loaderインポートからTakeFirst インポートscrapy.loader.processorsは
class NGASpider(CrawlSpider):
name = 'ngamedallions'
allowed_domains = ['nga.gov']
start_urls = [
'http://www.nga.gov/content/ngaweb/Collection/art-object-page.1312.html'
]
rules = (
Rule(LinkExtractor(allow=('art-object-page.*','objects/*')),callback='parse_CatalogRecord',
follow=True
),)
def parse_CatalogRecord(self, response):
CatalogRecord = ItemLoader(item=NgamedallionsItem(), response=response)
CatalogRecord.default_output_processor = TakeFirst()
keywords = "medal|medallion"
r = re.compile('.*(%s).*' % keywords, re.IGNORECASE|re.MULTILINE|re.UNICODE)
if r.search(response.body_as_unicode()):
CatalogRecord.add_xpath('title', './/dl[@class="artwork-details"]/dt[@class="title"]/text()')
CatalogRecord.add_xpath('accession', './/dd[@class="accession"]/text()')
CatalogRecord.add_xpath('inscription', './/div[@id="inscription"]/p/text()')
CatalogRecord.add_xpath('image_urls', './/img[@class="mainImg"]/@src')
return CatalogRecord.load_item()
設定再 輸入scrapy.httpのインポート要求から に参加インポート：
件のBOT_NAME = 'ngamedallions'
SPIDER_MODULES = ['ngamedallions.spiders']
NEWSPIDER_MODULE = 'ngamedallions.spiders'
DOWNLOAD_DELAY=3
ITEM_PIPELINES = {
'scrapy.pipelines.images.ImagesPipeline': 1,
}
IMAGES_STORE = '/home/tricia/Documents/Programing/Scrapy/ngamedallions/medallionimages'
アイテム：
import scrapy
class NgamedallionsItem(scrapy.Item):
title = scrapy.Field()
accession = scrapy.Field()
inscription = scrapy.Field()
image_urls = scrapy.Field()
images = scrapy.Field()
pass
エラーログ：それはリストである必要があるとき
2016-04-24 19:00:40 [scrapy] INFO: Scrapy 1.0.5.post2+ga046ce8 started (bot: ngamedallions)
2016-04-24 19:00:40 [scrapy] INFO: Optional features available: ssl, http11
2016-04-24 19:00:40 [scrapy] INFO: Overridden settings: {'NEWSPIDER_MODULE': 'ngamedallions.spiders', 'FEED_URI': 'items.json', 'SPIDER_MODULES': ['ngamedallions.spiders'], 'BOT_NAME': 'ngamedallions', 'FEED_FORMAT': 'json', 'DOWNLOAD_DELAY': 3}
2016-04-24 19:00:40 [scrapy] INFO: Enabled extensions: CloseSpider, FeedExporter, TelnetConsole, LogStats, CoreStats, SpiderState
2016-04-24 19:00:40 [scrapy] INFO: Enabled downloader middlewares: HttpAuthMiddleware, DownloadTimeoutMiddleware, UserAgentMiddleware, RetryMiddleware, DefaultHeadersMiddleware, MetaRefreshMiddleware, HttpCompressionMiddleware, RedirectMiddleware, CookiesMiddleware, ChunkedTransferMiddleware, DownloaderStats
2016-04-24 19:00:40 [scrapy] INFO: Enabled spider middlewares: HttpErrorMiddleware, OffsiteMiddleware, RefererMiddleware, UrlLengthMiddleware, DepthMiddleware
2016-04-24 19:00:40 [scrapy] INFO: Enabled item pipelines: ImagesPipeline
2016-04-24 19:00:40 [scrapy] INFO: Spider opened
2016-04-24 19:00:40 [scrapy] INFO: Crawled 0 pages (at 0 pages/min), scraped 0 items (at 0 items/min)
2016-04-24 19:00:40 [scrapy] DEBUG: Telnet console listening on 127.0.0.1:6023
2016-04-24 19:00:40 [scrapy] DEBUG: Crawled (200) <GET http://www.nga.gov/content/ngaweb/Collection/art-object-page.1312.html> (referer: None)
2016-04-24 19:00:44 [scrapy] DEBUG: Crawled (200) <GET http://www.nga.gov/content/ngaweb/Collection/art-object-page.1.html> (referer: None)
2016-04-24 19:00:48 [scrapy] DEBUG: Crawled (200) <GET http://www.nga.gov/content/ngaweb/Collection/art-object-page.1312.html> (referer: http://www.nga.gov/content/ngaweb/Collection/art-object-page.1312.html)
2016-04-24 19:00:48 [scrapy] ERROR: Error processing {'accession': u'1942.9.163.a',
'image_urls': u'http://media.nga.gov/public/objects/1/3/1/2/1312-primary-0-440x400.jpg',
'inscription': u'around circumference: IOHANNES FRANCISCVS GON MA; around bottom circumference: MANTVA',
'title': u'Gianfrancesco Gonzaga di Rodigo, 1445-1496, Lord of Bozzolo, Sabbioneta, and Viadana 1478 [obverse]'}
Traceback (most recent call last):
File "/usr/lib/python2.7/dist-packages/twisted/internet/defer.py", line 577, in _runCallbacks
current.result = callback(current.result, *args, **kw)
File "/usr/lib/pymodules/python2.7/scrapy/pipelines/media.py", line 44, in process_item
requests = arg_to_iter(self.get_media_requests(item, info))
File "/usr/lib/pymodules/python2.7/scrapy/pipelines/images.py", line 109, in get_media_requests
return [Request(x) for x in item.get(self.IMAGES_URLS_FIELD, [])]
File "/usr/lib/pymodules/python2.7/scrapy/http/request/__init__.py", line 24, in __init__
self._set_url(url)
File "/usr/lib/pymodules/python2.7/scrapy/http/request/__init__.py", line 55, in _set_url
self._set_url(url.encode(self.encoding))
File "/usr/lib/pymodules/python2.7/scrapy/http/request/__init__.py", line 59, in _set_url
raise ValueError('Missing scheme in request url: %s' % self._url)
ValueError: Missing scheme in request url: h
2016-04-24 19:00:48 [scrapy] DEBUG: Filtered duplicate request: <GET http://www.nga.gov/content/ngaweb/Collection/art-object-page.1312.html> - no more duplicates will be shown (see DUPEFILTER_DEBUG to show all duplicates)
2016-04-24 19:00:51 [scrapy] DEBUG: Crawled (200) <GET http://www.nga.gov/content/ngaweb/Collection/art-object-page.1313.html> (referer: http://www.nga.gov/content/ngaweb/Collection/art-object-page.1312.html)
2016-04-24 19:00:52 [scrapy] ERROR: Error processing {'accession': u'1942.9.163.b',
'image_urls': u'http://media.nga.gov/public/objects/1/3/1/3/1313-primary-0-440x400.jpg',
'inscription': u'around top circumference: TRINACRIA IANI; upper center: PELORVS ; across center: PA LI; across bottom: BELAVRA',
'title': u'House between Two Hills [reverse]'}
Traceback (most recent call last):
File "/usr/lib/python2.7/dist-packages/twisted/internet/defer.py", line 577, in _runCallbacks
current.result = callback(current.result, *args, **kw)
File "/usr/lib/pymodules/python2.7/scrapy/pipelines/media.py", line 44, in process_item
requests = arg_to_iter(self.get_media_requests(item, info))
File "/usr/lib/pymodules/python2.7/scrapy/pipelines/images.py", line 109, in get_media_requests
return [Request(x) for x in item.get(self.IMAGES_URLS_FIELD, [])]
File "/usr/lib/pymodules/python2.7/scrapy/http/request/__init__.py", line 24, in __init__
self._set_url(url)
File "/usr/lib/pymodules/python2.7/scrapy/http/request/__init__.py", line 55, in _set_url
self._set_url(url.encode(self.encoding))
File "/usr/lib/pymodules/python2.7/scrapy/http/request/__init__.py", line 59, in _set_url
raise ValueError('Missing scheme in request url: %s' % self._url)
ValueError: Missing scheme in request url: h
2016-04-24 19:00:55 [scrapy] DEBUG: Crawled (200) <GET http://www.nga.gov/content/ngaweb/Collection/art-object-page.1.html> (referer: http://www.nga.gov/content/ngaweb/Collection/art-object-page.1.html)
2016-04-24 19:01:02 [scrapy] INFO: Closing spider (finished)
2016-04-24 19:01:02 [scrapy] INFO: Dumping Scrapy stats:
{'downloader/request_bytes': 1609,
'downloader/request_count': 5,
'downloader/request_method_count/GET': 5,
'downloader/response_bytes': 125593,
'downloader/response_count': 5,
'downloader/response_status_count/200': 5,
'dupefilter/filtered': 5,
'finish_reason': 'finished',
'finish_time': datetime.datetime(2016, 4, 24, 23, 1, 2, 938181),
'log_count/DEBUG': 7,
'log_count/ERROR': 2,
'log_count/INFO': 7,
'request_depth_max': 2,
'response_received_count': 5,
'scheduler/dequeued': 5,
'scheduler/dequeued/memory': 5,
'scheduler/enqueued': 5,
'scheduler/enqueued/memory': 5,
'start_time': datetime.datetime(2016, 4, 24, 23, 0, 40, 851598)}
2016-04-24 19:01:02 [scrapy] INFO: Spider closed (finished)