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if response.xpath('//link[contains(@rel,"apple-touch-icon-precomposed")]/@href') :
apple_touch_url = response.xpath('//link[contains(@rel,"apple-touch-icon-precomposed")]/@href').extract()
apple_touch_url=[link for link in apple_touch_url if 'https' in link or 'http' in link ]
item['logo'] = apple_touch_url
if not apple_touch_url:
‘这里没有这个列表我想走 elif 的逻辑’但是好像没有这样的语法，求人指教，谢谢
elif response.xpath('//link[contains(@rel,"icon")]/@href'):
rel_url=response.xpath('//link[contains(@rel,"icon")]/@href').extract()
item['logo']=rel_url
print(rel_url)
Supplement 1 · Dec 3, 2018
if response.xpath('//link[contains(@rel,"apple-touch-icon-precomposed")]/@href') :
apple_touch_url = response.xpath('//link[contains(@rel,"apple-touch-icon-precomposed")]/@href').extract()
apple_touch_url=[link for link in apple_touch_url if 'https' in link or 'http' in link ]
item['logo'] = apple_touch_url
if not apple_touch_url:
‘这里没有这个列表我想走 elif 的逻辑’但是好像没有这样的语法，求人指教，谢谢
elif response.xpath('//link[contains(@rel,"icon")]/@href'):
rel_url=response.xpath('//link[contains(@rel,"icon")]/@href').extract()
item['logo']=rel_url
print(rel_url)
Supplement 2 · Dec 3, 2018
if response.xpath('//link[contains(@rel,"apple-touch-icon-precomposed")]/@href') :
apple_touch_url = response.xpath('//link[contains(@rel,"apple-touch-icon-precomposed")]/@href').extract()
apple_touch_url=[link for link in apple_touch_url if 'https' in link or 'http' in link ]
item['logo'] = apple_touch_url
if not apple_touch_url:
‘这里没有这个列表我想走 elif 的逻辑’但是好像没有这样的语法，求人指教，谢谢
elif response.xpath('//link[contains(@rel,"icon")]/@href'):
rel_url=response.xpath('//link[contains(@rel,"icon")]/@href').extract()
item['logo']=rel_url
print(rel_url)
8 replies • 2018-12-03 16:48:30 +08:00
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2
whoami9894 Dec 3, 2018 via Android
楼下有人能理解楼主想表达啥吗
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3
holajamc Dec 3, 2018
if not apple_touch_url and response.xpath('//link[contains(@rel,"icon")]/@href'):
猜的）
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4
kimchan Dec 3, 2018
我猜是他需要在最上边加一句: apple_touch_url = None
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5
ant2017 Dec 3, 2018
我猜是判断变量是否定义？
'apple_touch_url' in dir()
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7
Trim21 Dec 3, 2018
用 markdown 语法
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