如果新文件不存在则写入新文件，如果存在则追加到文件中 [英] Writing to a new file if it doesn't exist, and appending to a file if it does

问题描述

我有一个程序可以将用户的 highscore 写入文本文件.该文件由用户在选择 playername 时命名.

I have a program which writes a user's highscore to a text file. The file is named by the user when they choose a playername.

如果具有该特定用户名的文件已经存在，则程序应附加到该文件中(以便您可以看到多个highscore).如果具有该用户名的文件不存在(例如，如果用户是新用户)，则应创建一个新文件并写入该文件.

If the file with that specific username already exists, then the program should append to the file (so that you can see more than one highscore). And if a file with that username doesn't exist (for example, if the user is new), it should create a new file and write to it.

这是相关的，目前还不能工作的代码:

Here's the relevant, so far not working, code:

try: 
    with open(player): #player is the varible storing the username input
        with open(player, 'a') as highscore:
            highscore.write("Username:", player)

except IOError:
    with open(player + ".txt", 'w') as highscore:
        highscore.write("Username:", player)

如果文件不存在，上面的代码会创建一个新文件，并写入它.如果存在，当我检查文件时没有附加任何内容，并且我没有收到任何错误.

The above code creates a new file if it doesn't exist, and writes to it. If it exists, nothing has been appended when I check the file, and I get no errors.

推荐答案

我不清楚您感兴趣的高分具体存储在哪里，但是下面的代码应该是您需要检查的代码文件存在并根据需要附加到它.与尝试/除外"相比，我更喜欢这种方法.

It's not clear to me exactly where the high-score that you're interested in is stored, but the code below should be what you need to check if the file exists and append to it if desired. I prefer this method to the "try/except".

import os
player = 'bob'

filename = player+'.txt'

if os.path.exists(filename):
    append_write = 'a' # append if already exists
else:
    append_write = 'w' # make a new file if not

highscore = open(filename,append_write)
highscore.write("Username: " + player + '\n')
highscore.close()

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