如何替换不在当前循环Python中的文本文件中的一行

Posted 2023-03-17

【中文标题】如何替换不在当前循环Python中的文本文件中的一行

【英文标题】：How do I replace a line in a text file thats not in the current loop Python

【发布时间】：2021-07-23 13:41:44

【问题描述】：

我是编程新手，所以如果有更简单的方法可以解决这个问题，请告诉我。有一个名为 Duelist.txt 的文本文件，其中包含以下内容：

-------------------------------------------------
Duelist: Seto Kaiba
Server: Amazon
Username: Kaibaman
Password: Blue-Eyes White Dragon
-------------------------------------------------
Duelist: Mokuba Kaiba
Server: Amazon
Username: Kaibaboy
Password: KaibabestBro
------------------------------------------------

如果login 和exists 是TRUE，则此changeUsername(login,duelistID,exists,server): 函数运行。如果他们想更改用户名，它会提示用户输入新的用户名，然后函数supposed 可以在当前位置后两行的Duelist.txt 中更改用户名，但事实并非如此。 ..

def changeUsername(login,duelistID,exists,server):
    index = 0
    username = "Username: "
    serverSearch = []
    duel = "Duelist: " + duelistID
    search = "Server: " + server
    if login == True and exists ==True:
        print("Would you like to change this username for " + server + "?")
        print("Press \"y\" key for yes or press \"n\" key for no followed by the Enter key")
        choice = input(f'duelistID:')

        if choice == "y":
            newUsername = input("Please enter new username: ")
            username += newUsername
            with open("Duelist.txt", 'r') as file:
                content = file.readlines()

                for line in content:
                    serverSearch.append(line.strip("\n"))

            with open("Duelist.txt", 'r+') as file:
                for index, line in enumerate(serverSearch):
                    if duel in line:
                        if search == serverSearch[index+1]:
                            serverSearch[index+2] = username
                            file.write(line.replace(serverSearch[index+2], username))
                            

            if choice == "n":
                pass
        
            print("Exiting Edit Server Username...")
            time.sleep(1)

这是函数changeUsername(login,duelistID,exists,server)中的用户输入 login 和 exists 为 True，duelistID 为 Mokuba Kaiba，server 为 Amazon。

Would you like to change this username for Amazon?
Press "y" key for yes or press "n" key for no followed by the Enter key
Mokuba Kaiba:y
Please enter new username: Mokuba
Exiting Edit Server Username...

用户输入后，我在Duelist.txt 中得到以下信息

Duelist: Mokuba Kaiba---------------------------
Duelist: Seto Kaiba
Server: Amazon
Username: Kaibaman
Password: Blue-Eyes White Dragon
-------------------------------------------------
Duelist: Mokuba Kaiba
Server: Amazon
Username: Kaibaboy
Password: KaibabestBro
-------------------------------------------------

我很难弄清楚这一点并提出一个简单的解决方案，但我只是一个拥有四流代码的三流编码器。谁能帮助这个函数做它应该做的事情？

【问题讨论】：

编辑文本文件的规则是，您应该读取一个文件，将原始或修改的行写入新文件，然后用原始名称重命名新文件。你可以看看***.com/q/55030437/3545273 或***.com/q/16604826/3545273

谢谢！我将在我未来的节目中坚持这一规则。感谢您的帮助！

【参考方案1】：

试试这个：

def changeUsername(login,duelistID,exists,server):
    index = 0
    username = "Username: "
    serverSearch = []
    duel = "Duelist: " + duelistID
    search = "Server: " + server
    if login == True and exists ==True:
        print("Would you like to change this username for " + server + "?")
        print("Press \"y\" key for yes or press \"n\" key for no followed by the Enter key")
        choice = input(f'duelistID:')

        if choice == "y":
            newUsername = input("Please enter new username: ")
            username += newUsername
            with open("Duelist.txt", 'r') as file:
                content = file.readlines()

            for line in content:
                serverSearch.append(line.strip("\n"))

            for index, line in enumerate(serverSearch):
                if duelistID in line:
                    serverSearch[index]=(serverSearch[index]).replace(duelistID,newUsername)

            with open("Duelist.txt","w") as file:
                file.write('\n'.join(serverSearch))

            if choice == "n":
                pass

            print("Exiting Edit Server Username...")

changeUsername(True,"Kaibaman",True,"Amazon")

我个人更喜欢将整个文本文件加载到列表中，进行所需的更改并将整个列表写回文件。

【讨论】：

非常感谢！您让我克服了障碍，我对您的答案进行了一些修改，以使该功能按我的意愿工作！非常感谢您的帮助，我刚刚启动了我的堆栈溢出帐户，所以我很高兴这里有像你这样的很棒的人！

【参考方案2】：

我认为我需要重新表述我的问题，但 Pervez 能够根据我的需要进行必要的更改。我只是添加了一些调整来提出以下内容：

def changeUsername(login,duelistID,exists,server):
    index = 0
    username = "Username: "
    serverSearch = []
    duel = "Duelist: " + duelistID
    search = "Server: " + server
    if login == True and exists ==True:
        print("Would you like to change this username for " + server + "?")
        print("Press \"y\" key for yes or press \"n\" key for no followed by the Enter key")
        choice = input(f'duelistID:')

        if choice == "y":
            newUsername = input("Please enter new username: ")
            username += newUsername
            with open("Duelist.txt", 'r') as file:
                content = file.readlines()

            for line in content:
                serverSearch.append(line.strip("\n"))

            for index, line in enumerate(serverSearch):
                if duelistID in line:
                    if search == serverSearch[index+1]:
                        serverSearch[index+2]=(serverSearch[index+2]).replace(serverSearch[index+2],username)

            with open("Duelist.txt","w") as file:
                file.write('\n'.join(serverSearch))

            if choice == "n":
                pass

            print("Exiting Edit Server Username...")

在这种情况下，如果函数可以匹配 duelistID 和 search 行，函数只会替换 Duelist.txt 中的文本。希望我解释得对。