Question

#This program calculates the average of integer entered
#Once the use press "S".
#"S" is the sentinel

COUNT= 0
SUM= 0
INT=1
Sentinel = "S"
print('Enter test scores as integers, or enter S to get average.')

INT=input('Enter integer: ')        # input received as a string to allow for the entry of "S"
#Continue processing as long as the user
#does not enter S
while INT!= Sentinel:
    INT=input('Enter integer: ')
    I=int(INT)                      #attempting to format the input(INT) as an integer
    COUNT= + 1
    SUM = COUNT + I
if INT == Sentinel:
    AVRG= SUM/(COUNT-1)

我不断收到此错误消息：回溯（最近一次调用最后一次）：文件“C:\Users\joshu\Documents\COP100 Python\practice examples\program4-13.py”，第 16 行，在我=整数(INT) ValueError：int() 的无效文字，基数为 10：'S'

Answer 1

您的代码假设用户将始终输入数值。

此行将接受用户输入的任何数据。它可以是数字或非数字。

INT=input('Enter integer: ')        # input received as a string to allow for the entry of "S"

在将数据转换为整数之前，请检查该值是否为数字。如果不是，那么您可能需要向用户发送一条错误消息。

I=int(INT)                      #attempting to format the input(INT) as an integer

你可以这样做：

if INT.isnumeric():
    I = int(INT)
else:
    print ('not a numeric value')

我假设用户只会输入整数。上面的代码仅适用于整数。如果要检查浮点数，请使用 try: except 语句。

此外，您计算 SUM 以获得平均值是不正确的。您不应将 COUNT 添加到 SUM。您应该只在增加 I 时将 SUM 添加到 COUNT。

也不要尝试使用变量名作为 sum、int（即使是大写）。

这是您可以尝试的工作代码。

count = 0
total = 0
Sentinel = "S"

#Continue processing as long as the user does not enter S
while True:
    test_score = input('Enter test score as integer or enter S to get average: ')
    # input received as a string to allow for the entry of "S"
    
    if test_score.isnumeric():
        score = int(test_score)  #attempting to format the input(INT) as an integer
        count += 1
        total += score
    elif test_score.upper() == Sentinel:
        break
    else:
        print ('Not an integer or S. Please re-enter the value')
if count > 0:
    print (total, count)
    average_score = total/count
    print ('average score is : ', average_score)
else:
    print ('No valid entries were made. Average score is N/A')

将输入字符串转换为整数

1 个答案: