for循环中的Python While循环只运行一次为什么？

Question

你好，这是我第一次在这里发帖。我是软件开发新手。好几天来我一直被这个问题困扰着。我无法使while循环在for循环中再次运行。我通常需要两个循环。一个是当人们回答QQI5时，另一个是当答案是QQI6但不是运气时。所以这里我只尝试一个for循环。还有里面的while循环。任何帮助都将不胜感激

studentName = input("Enter Your Name: ")
courseName = input("Enter Course Name: ")
courseLevel = int(input("Enter QQI Level 5 or 6: "))

# Sets variable Data

positiveNumber = True
assignmentsCount = 0
assignmentsTotal = 0


if courseLevel == 6:
    for i in range(3):
        component = input("Enter Component's Name")

        while positiveNumber:
            assignmentToAdd = float(input("Enter assignment score or press -1 to Finish "))
            if assignmentToAdd >= 0:
                assignmentsTotal += assignmentToAdd
                assigmentsCount = +1
            if assignmentToAdd ==100:
                positiveNumber = False
            else:
                positiveNumber = False
        if assignmentsTotal < 50:
            print(assignmentsTotal, "Unsuccessful")
        elif assignmentsTotal >= 50 or assignmentsTotal <65:
            print(assignmentsTotal, "Pass")
        elif assignmentsTotal >= 65 or assignmentsTotal < 80:
            print(assignmentsTotal, "Merit")
        else:
             if assignmentsTotal >= 80:
                print(assignmentsTotal, "Distinction")

Answer 1

当您输入while loop时positiveNumber仅为True，因为在while循环结束时，您的代码显示：

        if assignmentToAdd ==100:
            positiveNumber = False
        else:
            positiveNumber = False

因此，无论assignmentToAdd是什么，在while循环的下一次迭代检查中，positiveNumber是False，因此while循环将退出

Answer 2

因为这部分代码

            if assignmentToAdd ==100:
                positiveNumber = False
            else:
                positiveNumber = False

这意味着在任何情况下，将False分配给positiveNumber