列表中的 Python 用户输入

Question

我是 python 编程的新手，在任何地方都找不到这个帮助我有一个要在指定列表 exp 中搜索的用户输入值：option=input("option: ")iplist=['192.168.1.1', '192.168.1.2', '192.168.1.254']while option <= "3":  #this is wrong. Help!  nub = iplist[option]  subprocess.call(["ping", nub])我希望用户的选项是该程序列表中的数字，输出应该是：Option : 0Pinging 192.168.1.1 with 32 bytes of data:Reply from 192.168.1.1: bytes=32 time=2ms TTL=64Reply from 192.168.1.1: bytes=32 time=2ms TTL=64Reply from 192.168.1.1: bytes=32 time=2ms TTL=64Reply from 192.168.1.1: bytes=32 time=2ms TTL=64Ping statistics for 192.168.1.1:    Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),Approximate round trip times in milli-seconds:    Minimum = 2ms, Maximum = 2ms, Average = 2ms

Answer 1

为什么需要循环？使用in检查，如果在列表中存在的输入值，并相应如下：

option=input("option: ")

iplist=['192.168.1.1', '192.168.1.2', '192.168.1.254']

if option in iplist:

   # do the rest

    pass

或：

如果要获取Index列表中元素的 ：

for index, elem in enumerate(iplist):

    if option == elem:

        print("Element found at Index: {}".format(index))

输出：

option: 192.168.1.2

Element found at Index: 1

编辑 2：

首先要注意以下几点：

从用户那里获取输入并将其转换为 anint因为您无法使用 str 索引访问列表：

我仍然没有看到循环点

所以：

import subprocess

option= int(input("option: "))    # 1

iplist=['192.168.1.1', '192.168.1.2', '192.168.1.254']

nub = iplist[option]

subprocess.call(["ping", nub])

输出：

Pinging 192.168.1.2 with 32 bytes of data:

Request timed out.

Request timed out.

Request timed out.

Request timed out.

Ping statistics for 192.168.1.2:

    Packets: Sent = 4, Received = 0, Lost = 4 (100% loss),