如果新文件不存在则写入新文件，如果存在则追加到文件

本文介绍了如果新文件不存在则写入新文件，如果存在则追加到文件的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

我有一个程序将用户的 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(以便您可以看到多个 highscore).如果不存在具有该用户名的文件(例如，如果用户是新用户)，它应该创建一个新文件并写入它.

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，到目前为止还没有工作的代码:

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.如果它存在，则在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

我不清楚你感兴趣的高分到底存储在哪里，但是下面的代码应该是你需要检查的文件存在并在需要时附加到它.我更喜欢这种方法而不是try/except".

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 + ' ') highscore.close()