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我不能完全让这个 python 程序工作，每次我运行它时，它都会在第 25 行出现“缩进中制表符和空格的不一致使用”错误，这是“else”循环。我尝试了各种方法来解决这一切都无济于事，所以想知道是否有人可以解释我的问题。非常感谢您的时间。

questions = ["What does RAD stand for?",
        "Why is RAD faster than other development methods?",
        "Name one of the 3 requirements for a user friendly system",
        "What is an efficient design?",
        "What is the definition of a validation method?"]


answers = ["A - Random Applications Development, B - Recently Available Diskspace, C - Rapid Applications Development",
        "A - Prototyping is faster than creating a finished product, B - Through the use of CASE tools, C - As end user evaluates before the dev team",
        "A - Efficient design, B - Intonated design, C - Aesthetic design",
        "A - One which makes best use of available facilities, B - One which allows the user to input data accurately, C - One which the end user is comfortable with",
        "A - A rejection of data which occurs because input breaks predetermined criteria, B - A double entry of data to ensure it is accurate, C - An adaption to cope with a change external to the system"]

correctanswers = ["C", "B", "A", "A", "A"]

score = 0

for i in range(len(questions)):
    a = 1
    print (questions[a])
    print (answers[a])
    useranswer = (input("Please enter the correct answer's letter here:"))
    correctanswer = correctanswers[a]
    if useranswer is correctanswer:
            print("Correct, well done!")
            score = score + 1
        else:
            print("Incorrect, sorry!")

print("Well done, you scored" + score + "//" + int(len(questions)))
4

4 回答 4

3

您正在混合制表符和空格，运行 python-tt以检查：

python -tt scriptname.py

将您的编辑器配置为仅使用空格进行缩进。通常，还有一个菜单选项可以将所有制表符转换为空格。

显然，当您将代码粘贴到 Stack Overflow 窗口时，您已经可以看到您的else:行仅使用了空格，但其他行使用了制表符：

    if useranswer is correctanswer:
            print("Correct, well done!")
            score = score + 1
        else:
            print("Incorrect, sorry!")

因为 Stack Overflow 将制表符呈现为 4 个空格。

于 2013-02-15T12:06:40.177 回答
1

缩进代码时，请使用制表符或空格。不要混合使用这些（即你不能在一行上使用制表符而在下一行使用空格）。

于 2013-02-15T12:06:17.837 回答
1

您else的缩进级别应该与if.

   if useranswer is correctanswer:
        print("Correct, well done!")
        score = score + 1
   else:
        print("Incorrect, sorry!")
于 2013-02-15T12:06:33.137 回答
0

至少在这个代码块上，你的 if 和 else 有不同的意图，它们应该是相同的。

if useranswer is correctanswer:
        print("Correct, well done!")
        score = score + 1
    else:
        print("Incorrect, sorry!")

应该：

if useranswer is correctanswer:
        print("Correct, well done!")
        score = score + 1
else:
        print("Incorrect, sorry!")
于 2013-02-15T12:06:19.193 回答