python try and except 函数内部的值错误

Question

nameList = []
scoreList = []
gradeList = []
run = 1
loop = 1

定义输入函数():

className = input("\nWhat is the class name: ")
topic = input("What is the topic: ")
while run == 1:

    studentName = input("What is the students name? Enter 'done' to exit: ")

    if studentName in ("done", "Done"):
        break

    try:
        studentScore = int(input("What is the student's score? "))
    except ValueError:
        print("nonono")

    if studentScore <50:
        grade = "NA"
    if studentScore >49 and studentScore <70:
        grade = "A"
    if studentScore > 69 and studentScore < 90:
        grade = "M"
    if studentScore > 89:
        grade = "E"
    nameList.append(studentName)
    scoreList.append(studentScore)
    gradeList.append(grade)
print("\nClass Name:",className)
print("Class Topic:",topic)

我正在尝试使用 try and except 变量“studentScore”，但是它给了我错误“名称'studentScore'未定义”感谢任何帮助

Answer 1

您可以使用 while 循环不断询问用户输入有效整数，直到用户输入一个:

while True:
    try:
        studentScore = int(input("What is the student's score? "))
        break
    except ValueError:
        print("Please enter a valid integer as the student's score.")