回答編集履歴
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コードの追加
test
CHANGED
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tomohiro_obaraさん、アドバイスありがとうございました
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以下のようになりました
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```
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import urllib2
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f = urllib2.urlopen('http://www.amazon.co.jp/gp/offer-listing/4785380322/ref=tmm_hrd_used_olp_sr?ie=UTF8&condition=used&qid=&sr=')
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html = f.read()
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import re
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targetCol = re.search(r'olpOfferPrice a-text-bold.*',html)
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matchPrice = re.search(r'\d,\d+',targetCol.group(0))
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nowPrice = matchPrice.group(0).replace(",","")
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import commands
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oldPrice = commands.getoutput('tail -1 /Users/example/scraping/amazon/priceLog.txt')
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echo1 = commands.getoutput('echo "now price gets cheaper. %s yen"' %nowPrice)
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echo2 = commands.getoutput('echo "the price is not changing. %s yen"' %nowPrice)
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echo3 = commands.getoutput('echo "now price gets higher. %s yen"' %nowPrice)
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write = commands.getoutput('echo %s >> /Users/example/scraping/amazon/priceLog.txt'%nowPrice )
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if int(nowPrice) < int(oldPrice):
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print echo1
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print write
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elif int(nowPrice) == int(oldPrice):
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print echo2
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else:
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print echo3
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print write
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```
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