Python - .txtファイルの検証、書き込み、追加

Question

私のクローラが私の.txtファイルに保存されているものからWebから取得するリンクを検証したいと思います。クローラがWebからリンクを取得した後、それは私の.txtファイルに（ 'a'）を追加します。ただし、リンクが既に自分の.txtファイルに存在する場合は、（ 'w'）を付けて追加したいと思います。どのように私はそれを行うことができますか？

def spider(targetname, DOMAIN, g_data): 
    for item in g_data: 
     try: 
      name = item.find_all("strong", {"class": "fullname show-popup-with-id "})[0].text 
      username = item.find_all("span", {"class": "username u-dir"})[0].text 
      post = item.find_all("p", {"class": "TweetTextSize TweetTextSize--normal js-tweet-text tweet-text"})[0].text 
      replies = item.find_all("span", {"class": "u-hiddenVisually"})[3].text 
      retweets = item.find_all("span", {"class": "u-hiddenVisually"})[4].text 
      likes = item.find_all("span", {"class": "u-hiddenVisually"})[5].text 
      retweetby = item.find_all("a", {"href": "/"+targetname})[0].text 
      datas = item.find_all('a', {'class':'tweet-timestamp js-permalink js-nav js-tooltip'}) 
      for data in datas: 
       link = DOMAIN + data['href'] 
       date = data['title'] 
      append_to_file(crawledfile, name, username, post, link, replies, retweets, likes, retweetby, date) 
     except: 
      pass 


`def append_to_file(path, name, username, post, link, replies, retweets, likes, retweetby, date): 
    with open(path, 'a') as file: 
     try: 
      file.write("Name: "+ name + '\n') 
     except: 
      print("Name: --Currently unavailable--" + '\n') 
     try: 
      file.write("Username: "+ username + '\n') 
     except: 
      print("Username: --Currently unavailable--" + '\n') 
     try: 
      file.write("Post: "+ post + '\n') 
     except: 
      print("Post: --Currently unavailable--" + '\n') 
     try: 
      file.write("post's link: "+ link.strip() + '\n') 
     except: 
      print("post's link: --Currently unavailable--" + '\n') 
     try: 
      file.write("Replies: "+ replies.strip() + '\n') 
     except: 
      print("Replies: --Currently unavailable--" + '\n') 
     try: 
      file.write("Retweet: "+ retweets.strip() + '\n') 
     except: 
      print("Retweet: --Currently unavailable--" + '\n') 
     try: 
      file.write("Likes: "+ likes.strip() + '\n') 
     except: 
      print("Likes: --Currently unavailable--" + '\n') 
     try: 
      if(username != "@" + targetname): 
       file.write("Retweeted By: " + retweetby.strip() + '\n') 
     except: 
      file.write("Retweeted By: --Currently unavailable--" + '\n') 
     try: 
      file.write("Date: " + date + '\n') 
     except: 
      file.write("Date: --Currently unavailable--" + '\n') 
     file.write("" + '\n')` 




Name: Donald J. Trump Username: @realDonaldTrump Post: I look forward to paying my respects to our brave men and women on this Memorial Day at Arlington National Cemetery later this morning. post's link: https://twitter.com/realDonaldTrump/status/869170615881793536 Replies: 14,333 replies Retweet: 13,492 retweets Likes: 74,645 likes Date: 5:36 AM - 29 May 2017 

Name: Donald J. Trump Username: @realDonaldTrump Post: Today we remember the men and women who made the ultimate sacrifice in serving. Thank you, God bless your families & God bless the USA! post's link: https://twitter.com/realDonaldTrump/status/869170351049240576 Replies: 8,827 replies Retweet: 33,541 retweets Likes: 123,112 likes Date: 5:35 AM - 29 May 2017 

Answer 1

私が正しくあなたの文を解釈する場合は、あなただけのリンクはすでにファイルまたはない存在する場合、条件に基づいて、文字「A」またはテキストファイルには「w」を追加する必要があります。このためには、次のコードを使用することができます：

def append_to_file(path, name, username, post, link, replies, retweets, likes, retweetby, date): 
    with open(path, 'a') as file: 
     if link.strip() in file.read(): 
      to_append = 'a' 
     else: 
      to_append = 'w' 
     try: 
      file.write("Name: " + name + to_append + '\n') 
     except: 
      print("Name: -- Currently unavailable--" + '\n') 
     try: 
      file.write("Username: " + username + to_append + '\n') 
     except: 
      print("Username: -- Currently unavailable--" + '\n') 
     try: 
      file.write("Post: " + post + to_append + '\n') 
     except: 
      print("Post: -- Currently unavailable--" + '\n') 
     try: 
      file.write("post's link: " + link.strip() + to_append + '\n') 
     except: 
      print("post's link: -- Currently unavailable--" + '\n') 
     try: 
      file.write("Replies: " + replies.strip() + to_append + '\n') 
     except: 
      print("Replies: -- Currently unavailable--" + '\n') 
     try: 
      file.write("Retweet: " + retweets.strip() + to_append + '\n') 
     except: 
      print("Retweet: -- Currently unavailable--" + '\n') 
     try: 
      file.write("Likes: " + likes.strip() + to_append + '\n') 
     except: 
      print("Likes: -- Currently unavailable--" + '\n') 
     try: 
      if(username != "@" + targetname): 
       file.write("Retweeted By: " + 
          retweetby.strip() + to_append + '\n') 
     except: 
      file.write(
       "Retweeted By: -- Currently unavailable--" + '\n') 
     try: 
      file.write("Date: " + date + to_append + '\n') 
     except: 
      file.write("Date: -- Currently unavailable--" + 
         to_append + '\n') 
     file.write("" + '\n')