Question

嗨，我是python编程的新手，在任何地方都找不到此帮助

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])

我希望用户的选项成为该程序列表中的数字，输出应为：

Option : 0

Pinging 192.168.1.1 with 32 bytes of data:
Reply from 192.168.1.1: bytes=32 time=2ms TTL=64
Reply from 192.168.1.1: bytes=32 time=2ms TTL=64
Reply from 192.168.1.1: bytes=32 time=2ms TTL=64
Reply from 192.168.1.1: bytes=32 time=2ms TTL=64

Ping 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检查输入值是否存在于列表中，并按照以下步骤进行操作：

option=input("option: ")
iplist=['192.168.1.1', '192.168.1.2', '192.168.1.254']

if option in iplist:
   # do the rest
    pass

OR ：

如果要获取列表中元素的Index：

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 ：

首先要注意几件事：

从用户那里获取输入并将其转换为int，因为您无法使用str索引访问列表：
我仍然看不到循环点

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),

列表中的Python用户输入

1 个答案: