如何在列表中一一输入n个数字? [英] How to input n numbers in list one by one?

问题描述

我希望我的程序询问n的值.用户输入值后， 程序接受n个值的输入，并将它们存储在列表或类似数组(在C中)中. 输入必须采用以下格式:

I want my program to ask a value of n. After user inputs the value, program takes input for n values and stores them in a list or something like array (in C). Input must be in the format:

Enter value of n: 4
2
5
7
1

我想将此输入存储在列表中以供以后使用.

I want to store this input in a list for my later use.

推荐答案

最简单的方法是这样的:

The simplest approach is something like this:

n = int(input())
l = [int(input()) for _ in range(n)]

但是这有很多问题:

• 输入无效时会崩溃.
• 它评估危险的输入-用户可以修改您的程序状态. (Python 2.x)
• 用户可以输入浮点数，程序不会抱怨，它只会默默地截断. (Python 2.x)

相反，您可以使用raw_input并将结果解析为整数.您还将需要在适当的位置进行错误处理.处理错误的方式取决于程序.

Instead you can use raw_input and parse the result as an integer. You will also need error handling in the appropriate locations. How you handle errors depend on the program.

您可能会发现此功能可能对您有所帮助:

You might find this function might be useful as a starting point:

def getNumber(prompt = ''):
    while True:
        try:
            return int(raw_input(prompt))
        except:
            print "Invalid input, try again."

请注意，在Python 2.x和Python 3.x之间，input和raw_input的行为已更改. Python 3.x的输入函数的行为类似于Python 2.x的raw_input函数.

Note that the behaviour of input and raw_input has changed between Python 2.x and Python 3.x. Python 3.x's input function behaves like Python 2.x's raw_input function.

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