“AttributeError: 'list' 对象没有属性 'replace'

如何解决“AttributeError: 'list' 对象没有属性 'replace'

我正在尝试替换 txt 文件中某一行的特定部分，但显示“AttributeError: 'list' 对象没有属性 'replace'”。

这是我的代码的一部分：

with open("credentials.txt",'r+') as f:
  credentials_array = f.readlines() # credentials_array contains the txt file's contents,arranged line by line. so credentials_array[0] would be the first login info in the file
  lines_in_credentials = len(credentials_array) # if there are 7 credentials in the text file,lines_in_credentials = 7.

  while x < lines_in_credentials:

    if user in credentials_array[x]: # go through each line in turn to see if the login_username is in one. line 1,credentials_array[1].
      credentials_desired_line = credentials_array[x]

      username_password_score = credentials_array[x].split(",") # username_password_score is the contents of each line,the contents are split by commas
      stored_username = username_password_score[0] # username is part 1
      stored_password = username_password_score[1] # password is part 2
      stored_score = username_password_score[2] # score is part 3
      stored_score_int = int(stored_score)

      if user == stored_username:

        if new_score > stored_score_int:
          print("Congratulations! New high score!")
          print(stored_score_int,"-->",new_score)
          credentials_array_updated = stored_username+","+stored_password+","+str(new_score) # reassign the array[x] to having new_score at the end instead of stored_score
          credentials_array.replace(credentials_array[x],credentials_array_updated)

        break

还有其他方法吗？

解决方法

您在提出的问题中遗漏了一行设置 x = 0，但这并不重要 - 我认为这只是您在写出来时遗漏的一个错字。

您的线路：

credentials_array.replace(credentials_array[x],credentials_array_updated)

是你的问题。试试：

credentials_array[x].replace(credentials_array[x],credentials_array_updated)

replace 对字符串进行操作，您希望替换credentials_array[x] 中的字符串，而不是整个列表。

现在，我假设credentials_desired_line 的条目比您在username_password_score 中概述的条目多。否则，您可以直接进行替换，例如：

credentials_array[x] = credentials_array_updated

作为一个更大的改变，你可以试试这个：

iLines = 0
with open("credentials.txt",'r+') as f:
    credentials_array = f.readlines()  


    for line in credentials_array:
        if user in line: #user we want is in this line

            currScore = int(credentials_array[x].split(",")[2])

            if new_score > currScore:
                print("Congratulations! New high score!")
                print(Str(currScore),"-->",str(new_score))
                credentials_array[iLines].replace(str(currScore),str(newScore))
            break
        iLines =+1
   

如果你想更新文本文件，你的代码的最小修改就是把它放在前面的“with open()”循环的末尾（超出/之外）：

with open('credentials.txt','w') as f:
    for line in credentials_array:
        f.write("%s\n" % line)