スクレイピングは茨の道/Scraping is a thorny road

前回LT「Python + Selenium + Beautiful Soup でスクレイピング」の
1.おさらい
2.失敗から学ぶ
3.ソースの修正
4.結論

Transcript

1. 2018年12月15日 kanazawa.rb meetup#76 εΫϨΠϐϯά͸
   ҵͷಓ
2. !DPUUPO@EFTV
   ΏΔͬͱ;ΘͬͱอकΤϯδχΞ ׂ
   ৽ن։ൃɾۀ຿վળ
   ׂ
   อक ػೳ௥Ճɺػೳमਖ਼ɺόάमਖ਼ FUD
3. ΞδΣϯμ  લճ-5ͷ͓͞Β͍
    લճ-5ࣦഊ͔ΒֶͿ
    ιʔεͷमਖ਼
    ݁࿦
4. લճ-5ͷ͓͞Β͍
5. 1ZUIPO
   
   4FMFOJVN
   
   #FBVUJGVM
   4PVQ
   ͰεΫϨΠϐϯά
6. εΫϨΠϐϯάͱ͸ʁ
7. εΫϨΠϐϯά w ΢ΣϒαΠτ͔Β৘ใΛநग़͢Δ
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   ίϯϐϡʔλιϑτ΢ΣΞٕज़
   w ݴޠ͸1FSMɺ1ZUIPOɺ3VCZɺ+BWB4DSJQUͰ
   
   
   
   
   
   
   
   
   ϥΠϒϥϦ͋Γ
8. શମͷߏ੒ਤ
9. શମͷߏ੒ਤ ϑΥϧμ EJSFOW
   
   WFOW QZϑΝΠϧ 4FMFOJVN XFC
   ESJWFS ϩάΠϯϖʔδ $ISPNF
10. %FNP͕՚ྷʹ
    Τϥʔ
11. લճ-5ࣦഊ͔ΒֶͿ
12. ίʔυ֬ೝ
13. class main(): options = Options() # ChromeͷύεʢStableνϟωϧͰ--headless͕࢖͑ΔΑ͏ʹͳͬͨΒෆཁͳ͸ͣʣ options.binary_location = '/Applications/Google Chrome.app/Contents/MacOS/Google Chrome' # ϔουϨεϞʔυΛ༗ޮʹ͢Δʢ࣍ͷߦΛίϝϯτΞ΢τ͢Δͱը໘͕දࣔ͞ΕΔʣɻ options.add_argument('--headless') # ChromeͷWebDriverΦϒδΣΫτΛ࡞੒͢Δɻ driver = webdriver.Chrome( os.environ["CHROMEDRIVER"], chrome_options=options) # ϩάΠϯαΠτURL driver.get(os.environ["URL"]) # ϩάΠϯID driver.find_element_by_xpath( "//div[@class='sub-content']/dl/dd/div/input").send_keys( os.environ["LOGIN_USER_ID"]) # ϩάΠϯύεϫʔυ username = driver.find_element_by_xpath( "//div[@class='sub-content']/dl/dd[2]/div/input").send_keys( os.environ["LOGIN_USER_PASS"]) # ϩάΠϯϘλϯԡԼ driver.find_element_by_name("login").click() # ޱ࠲؅ཧʹભҠ driver.find_element_by_xpath(“//div[@id='link']/ul/li[10]").click() html = driver.page_source soup = BeautifulSoup(html, 'html.parser')
14. # อ༗ޱ਺ɺऔಘ୯Ձɺऔಘ୯ՁɺධՁଛӹͷऔಘ item_name = ['อ༗ޱ਺ɹɹ |', 'औಘ୯Ձɹɹ |', 'ج४Ձֹɹɹ |', 'ධՁଛӹɹɹ |'] # ౤ࢿ৴ୗ໊ͷऔಘ investmentname = [] investments = soup.find_all('td', class_='mbody', colspan="3") for investment in investments: investmentname.append(investment.a.text) inves_num = 0 row_num = 0 various_values = soup.find_all('tr', bgcolor='#eaf4e8', align="right") for various_value in various_values: # ౤ࢿ৴ୗ໊ͷදࣔ print(investmentname[inves_num]) # อ༗ޱ਺ͷදࣔ print(item_name[row_num], various_value.td.text) for other in various_value.td.find_next_siblings("td"): row_num = row_num + 1 # อ༗ޱ਺Ҏ֎ͷදࣔ print(item_name[row_num], other.text) row_num = 0 inves_num = inves_num + 1 # શͯͷΫοΩʔΛ࡟আ driver.delete_all_cookies() driver.quit() if __name__ == "__main__": main()
15. ໰୊఺
16. ҟৗऴྃ࣌ʹϓϩηε ͕࢒Γଓ͚Δ ϔουϨεϒϥ΢βͷͨΊΘ͔Γʹ͍͘
17. ղܾࡦ
18. ҟৗऴྃ࣌Ͱ΋ϓϩηε Λऴྃͤ͞Δඞཁ͕͋Δ
19. ιʔεͷमਖ਼
20. class main(): try: options = Options() # ChromeͷύεʢStableνϟωϧͰ--headless͕࢖͑ΔΑ͏ʹͳͬͨΒෆཁͳ͸ͣʣ options.binary_location = '/Applications/Google Chrome.app/Contents/MacOS/Google Chrome' # ϔουϨεϞʔυΛ༗ޮʹ͢Δʢ࣍ͷߦΛίϝϯτΞ΢τ͢Δͱը໘͕දࣔ͞ΕΔʣɻ options.add_argument('--headless') # ChromeͷWebDriverΦϒδΣΫτΛ࡞੒͢Δɻ driver = webdriver.Chrome( os.environ["CHROMEDRIVER"], chrome_options=options) # ϩάΠϯαΠτURL driver.get(os.environ["URL"]) # ϩάΠϯID driver.find_element_by_xpath( "//div[@class='sub-content']/dl/dd/div/input").send_keys( os.environ["LOGIN_USER_ID"]) # ϩάΠϯύεϫʔυ username = driver.find_element_by_xpath( "//div[@class='sub-content']/dl/dd[2]/div/input").send_keys( os.environ["LOGIN_USER_PASS"]) # ϩάΠϯϘλϯԡԼ driver.find_element_by_name("login").click() # ޱ࠲؅ཧʹભҠ driver.find_element_by_xpath(“//div[@id='link']/ul/li[10]").click() html = driver.page_source soup = BeautifulSoup(html, 'html.parser') मਖ਼Օॴ͸੺࿮
21. # อ༗ޱ਺ɺऔಘ୯Ձɺऔಘ୯ՁɺධՁଛӹͷऔಘ item_name = ['อ༗ޱ਺ɹɹ |', 'औಘ୯Ձɹɹ |', 'ج४Ձֹɹɹ |', 'ධՁଛӹɹɹ |'] # ౤ࢿ৴ୗ໊ͷऔಘ investmentname = [] investments = soup.find_all('td', class_='mbody', colspan="3") for investment in investments: investmentname.append(investment.a.text) inves_num = 0 row_num = 0 various_values = soup.find_all('tr', bgcolor='#eaf4e8', align="right") for various_value in various_values: # ౤ࢿ৴ୗ໊ͷදࣔ print(investmentname[inves_num]) # อ༗ޱ਺ͷදࣔ print(item_name[row_num], various_value.td.text) for other in various_value.td.find_next_siblings("td"): row_num = row_num + 1 # อ༗ޱ਺Ҏ֎ͷදࣔ print(item_name[row_num], other.text) row_num = 0 inves_num = inves_num + 1 except NoSuchElementException as e: print("seleniumͷૢ࡞தʹΤϥʔ͕ൃੜ͠·ͨ͠ɻ") traceback.print_exc() finally: # શͯͷΫοΩʔΛ࡟আ driver.delete_all_cookies() driver.quit() if __name__ == "__main__": main() मਖ਼Օॴ͸੺࿮
22. ݁࿦
23. ݁࿦ w εΫϨΠϐϯά͸ඞͣ੒ޭ͢Δͱ͸ݶΒͳ͍
    w ྫ֎ॲཧ USZ
    FYDFQU
    pOBMMZ ͕ඞཁ w ͍ͭͰ΋ਖ਼ৗऴྃͤ͞Δॲཧ͕ඞཁ