如何使用python添加文本文件？

基本上，我正在为我的discord机器人制作一个货币系统，我正在试图找出如何在文本文件中添加一个数字，比如如果我做^work（前缀+消息），它会在文本文件中添加+100，这是我的代码，顺便说一下，用户名=message.author.name

if (str(username)) in f.read():
      with open("currency.txt", "r") as f:
        lines = f.readlines()
      with open("currency.txt", "r") as f:
        for line in lines:
          if line.strip("\n") != (str(username)):
            (+100)
    else:
      f = open ("currency.txt","a")
      f.write (str(username)+("+100"))
      f.write ("\n")
      f.close()

尝试创建一个json文件（您可以创建一个全局变量，这样您就可以在任何地方使用它），因此您应该使用

@client.event

，当bot联机时，它会启动

@client.event
async def on_ready():
    global currency #Creates the global variable
    try:
        with open('currency.json') as f: #Opens json file
            currency = json.load(f)

要保存json文件，您必须创建一个带有

的定义，以便可以在任何地方调用它

def _save():
    with open('currency.json', 'w+') as f: #Opens the file
        json.dump(currency, f) #Dumps the json file

如果要在其中存储数字，它必须是字符串，执行此操作的命令如下所示：

@client.command()
async def register(ctx):
    id = str(ctx.message.author.id) #Defines the author ID (Always a string!)

    if id not in currency: #Checks if the ID is already on the json file
        currency[id] = 500 #Sets the currency
        _save() #Saves the json file

    else:
        await ctx.send("You already have an account :x:")

@client.event
async def on_ready():
    global currency #Creates the global variable
    try:
        with open('currency.json') as f: #Opens json file
            currency = json.load(f)

@client.command()
async def register(ctx):
    id = str(ctx.message.author.id) #Defines the author ID (Always a string!)

    if id not in currency: #Checks if the ID is already on the json file
        currency[id] = 500 #Sets the currency
        _save() #Saves the json file

    else:
        await ctx.send("You already have an account :x:")

def _save():
    with open('currency.json', 'w+') as f: #Opens the file
        json.dump(currency, f) #Dumps the json file

所以最终的代码应该是这样的：

@client.command()
async def register(ctx):
    id = str(ctx.message.author.id) #Defines the author ID (Always a string!)

    if id not in currency: #Checks if the ID is already on the json file
        currency[id] = 500 #Sets the currency
        _save() #Saves the json file

    else:
        await ctx.send("You already have an account :x:")

@client.event
async def on_ready():
    global currency #Creates the global variable
    try:
        with open('currency.json') as f: #Opens json file
            currency = json.load(f)

@client.command()
async def register(ctx):
    id = str(ctx.message.author.id) #Defines the author ID (Always a string!)

    if id not in currency: #Checks if the ID is already on the json file
        currency[id] = 500 #Sets the currency
        _save() #Saves the json file

    else:
        await ctx.send("You already have an account :x:")

def _save():
    with open('currency.json', 'w+') as f: #Opens the file
        json.dump(currency, f) #Dumps the json file

PD:文件
currency.json
中应该包含以下内容：

{}

让我知道这是否有用
 问题出在哪里？要添加，我们是否应该在追加模式下打开…？我们没有使用列表，因此不，我们不应该使用.append（），因为它不是必需的。此外，我们正在使用用户ID，因为用户名可能会更改。