寻找最高分。 ValueError: int() 以 10 为底的无效文字：''

Question

我正在创建一个测验，其中每个用户的分数都保存到一个外部文本文件中。但是，每当我输出数学简单测验中最高分的报告时，它都会显示：ValueError: invalid literal for int() with base 10: ''

这似乎是问题所在： if highestScore <= int(line.strip()):

        with open("mathsEasy.txt") as mathsEasyFile:
        highestScore = 0
        for line in mathsEasyFile:
            if highestScore <= int(line.strip()):
                highestScore = int(line.strip())
    mathsEasyFile.close()

    print "The highest score is", highestScore

基本上，每次用户进行数学简单测验时，它都会将他们的分数保存到名为 mathsEasy.txt 的文本文件中 文本文件如下所示：the username : score 例如Kat15 : 4 我只需要输出最高分，而不是用户名。

Answer 1

现在您已经添加了文件如何工作的示例：

with open("mathsEasy.txt") as mathsEasyFile:
    highestScore = max(int(line.split(' : ')[1]) for line in mathsEasyFile if len(line.strip() != 0)
print("The highest score is %d" % highestScore)

分解以帮助您更好地理解它：

highestScore = 0 # in my previous code, I use max() instead
with open("mathsEasy.txt") as mathsEasyFile: # open the file
    for line in mathsEasyFile: # for each line in the file,
        if len(line.strip()) == 0: # if the current line is empty,
            continue # ignore it and keep going to the next line
        _,score = line.split(' : ') # split the line into its components
        if int(score) > highestScore: # if this score is better,
            highestScore = int(score) # replace the best score
print("The highest score is %d" % highestScore)

Answer 2

一些事情......

• 它可能只是在 StackOverflow 中进行格式化，但请确保您的缩进是正确的；在mathsEasyFile: 之后，您可能想要除最后的打印语句缩进之外的所有内容。
• 我认为您会想要添加类似lines = mathsEasyFile.readlines() 的内容，并使用类似for line in lines: 的内容进行迭代。您当前的设置没有读取任何文件内容，我不相信。不正确。请参阅下面的评论。
• mathsEasyFile.close() 已使用 with 语句为您完成

澄清编辑

# something like this ought to work
with open("mathsEasy.txt") as mathsEasyFile:
    highestScore = 0
    for line in mathsEasyFile:
        if highestScore <= int(line.strip()):
            highestScore = int(line.strip())

print "The highest score is", highestScore