超级烦人的缩进错误（Python）

Question

这是一个经典的意外缩进错误。下面是相关的代码。问题是我该如何修复它呢？

    def getNum():
        firstNum = input("Please state what number to start at: ")
        secondNum = input("Please state swhat number to end at: ")
        if countingSubmenu == 3 or countingSubmenu == 4:
            thirdNum = input("Please state what increment you would want to go up by: ")
            return firstNum, secondNum, thirdNum
        else:
            return firstNum, secondNum

    if option == 1:
        getNum(firstNum, secondNum, thirdNum)
        for x in range(firstNum, secondNum+1, 1):
            print x
        print "End of test." #def getNum():

Answer 1

这三行代码使用的是制表符，而不是空格：

            return firstNum, secondNum, thirdNum
        else:
            return firstNum, secondNum

你可以通过尝试编辑这个问题很容易地看到这一点，制表符的宽度相当于8个空格。