Python:如何在输入错误之前重复上一个输入提示?

问题描述

我有一个for语句，提示用户输入5.数字.像这样:

I have an for statement which prompts the user to input 5. numbers. Like this:

"Input 1. number:

input 2. number:

..
..
.."

我想重复用户在输入错误(数字太大)之前得到的最后一个提示.但是我的程序跳过了错误的程序:

I want to repeat the last prompt the user gets before he makes a wrong input (number too big).But my program skips the wrong one:

像这样

"Input 1. number:
5
Accepted

input 2. number:
999
Wrong! Retry
(here I use *continue* for the loop)

input 3.number:

---"

我该怎么做才能再次提出第二个问题?

What should I do to re-ask the second question?

推荐答案

使用continue，您可能会继续前进到下一个输入数字.尝试这样的事情:

By using continue you are probably continuing ahead to the next input number. Try something like this:

number_of_inputs = 10
max_input = 99
for i in range(number_of_inputs):
    answer = 0
    while not answer or answer > max_input:
        try:
             answer = int(raw_input('Input {}. number: '.format(i)))
        except ValueError:
             continue
    print 'The user selected', answer, 'for input', i

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