Question

正如问题所说。我正努力从学生那里获得4个“实用”成绩，同时保持每个年级的界限在0-40之内。但是我继续使用以下代码收到错误：

while True:
    try:
        mark = int(input("What was your first mark out of the four? "))
        if mark < 0 or mark > 40 :
            print("That is outside the score boundaries. Please try again.")
        else:
            break
    except  ValueError:
        print("That isn't a number!")

counter = 1
while counter <4:
    while True:
        try:
            mark += int(input("And the next mark? "))
            if mark < 0-mark or mark > 40+mark :
                print("That is outside the score boundaries. Please enter the final three marks again.")
            else:
                break
        except  ValueError:
            print("That isn't a number! Please enter the final three marks again.")
    counter += 1

while True:
    try:
        end_mark = int(input("What was your end of year mark? "))
        if end_mark < 0 or end_mark > 60 :
            print("That is outside the score boundaries. Please try again.")
        else:
            break
    except  ValueError:
        print("That isn't a number!")


#calculations
average = mark/counter
total_score = average + end_mark

#processing
if total_score > 50:
    if end_mark < 30:
        print("You pass conditionally with %{}. Your practical mark was averaged at {}, but your end of year mark was only {}.".format(total_score, average, end_mark))
    else:
        print("You pass with %{}. Your practical mark was averaged at {}, and your end of year mark was {}.".format(total_score, average, end_mark))
else:
    print("Im sorry. You failed the year with %{}. Your practical mark averaged at {}, and the end of year mark was {}.".format(total_score, average, end_mark))

print("End of Code")

我怎么能解决这个问题？

Answer 1

这是因为您首先添加然后检查，因此mark永远不会是> 40+mark或< 0-mark。

mark += int(input("And the next mark? "))
# The next line is where the problem is
if mark < 0-mark or mark > 40+mark : # mark will never be > 40+mark or less than 0-mark 
    print("That is outside the score boundaries. Please enter the final three marks again.")
else:
    break

这样做。

tmp = int(input("And the next mark? "))
    if not (0 <= mark <= 40):
        print("That is outside the score boundaries. Please enter the final three marks again.")
    else:
        mark += tmp
        break

Python：在while循环中添加边界值

1 个答案: