替換文本文件中的值

Question

我正在嘗試制作一個跟蹤玩家高分的功能。 該函數應將玩家的最高分保存在文本文件中。 如果在文本文件中找到玩家的名字，它應該查看新分數是否更高，如果更高，它將用新分數替換舊分數。

我嘗試使用以下代碼來做到這一點：

f1 = open('scores.txt', 'r')
f2 = open('scores.txt', 'a')

if f1.read() == "":  #if txt.file is empty, add the name and highscore directly
    f2.write(self.name)
    f2.write(";")
    f2.write('%d' % self.highscore)
    f2.write("\n")

else: #if not empty...
    with open("scores.txt", "r") as fin:
        with open("scores.txt", "a") as fout:
            for line in fin:
                fields = line.strip(";")
                if fields[0].lower() == self.name.lower(): #look if the players name is in textfile.
                    if int(fields[1]) < self.highscore: #if new score is higher, replace the old with it.
                        fout.write(line.replace(str(fields[1]), str(self.highscore)))
                        break
                    else:
                        pass
                else: #if name not found in file, create new line.
                    fout.write(self.name)
                    fout.write(";")
                    fout.write('%d' % self.highscore)
                    fout.write("\n")
f1.close()
f2.close()

預期的結果是舊的分數被新的替換，但現在它正在創建新的，有時它甚至將相同的高分寫在多行中。

Answer 1

您使用附加選項打開了 fout。 請改成“w+”

 else: #if not empty...
    with open("scores.txt", "r") as fin:
        with open("scores.txt", "w+") as fout:
            for line in fin:
                fields = line.strip(";")
                if fields[0].lower() == self.name.lower(): #look if the players name is in textfile.
                    if int(fields[1]) < self.highscore: #if new score is higher, replace the old with it.
                        fout.write(line.replace(str(fields[1]), str(self.highscore)))
                        break
                    else:
                        pass
                else: #if name not found in file, create new line.
                    fout.write(self.name)
                    fout.write(";")
                    fout.write('%d' % self.highscore)
                    fout.write("\n")

我無法調試代碼，因為沒有 score.txt 的示例。 我希望這奏效了。