Python user input inside list

Question

Hi I'm new to python programming and can't find this help anywhere

I have a user input value that I want to search for in a specified list exp :

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])

I want The Option Of The User To Be The Number Inside The List For This program the output should be :

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

`while int(option) <= 3:` and preferably `while int(option) <= len(iplist):`. And you'll notice that lists have a starting index of 0, meaning `3` will generated `IndexError` so you really want to do `while int(option) <= len(iplist)-1:` — Torxed, Mar 19 '19 at 10:28
@Torxed `while int(option) < 3:` or `while int(option) < len(iplist):` then — Bohdan Kaminskyi, Mar 19 '19 at 10:30

DirtyBit · Accepted Answer · 2019-03-19T10:38:07.933

0

Why do you need a loop? Use in to check if the input value exists in the list and follow accordingly:

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:

If you want to get the Index of the element in the list:

for index, elem in enumerate(iplist):
    if option == elem:
        print("Element found at Index: {}".format(index))

OUTPUT:

option: 192.168.1.2
Element found at Index: 1

EDIT 2:

There are a couple of things to note first:

Take the input from the user and convert it to an int since you cannot access the list with str indexing:
I still do not see a point of loop

So:

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])

OUTPUT:

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),

edited Mar 19 '19 at 10:38

answered Mar 19 '19 at 10:30

DirtyBit

16,613
4
34
55

1

OP is trying to select a list index. Not a specific IP by the looks of it? so `in` won't work. – Torxed Mar 19 '19 at 10:30
@Torxed That is what I guessed, edited. – DirtyBit Mar 19 '19 at 10:32
Again, I think the idea here is to do `option: 2` and a IP should be selected. – Torxed Mar 19 '19 at 10:33
Oh crap!!!! a moment please! – DirtyBit Mar 19 '19 at 10:33
1

Don't stress it haha, good answers should take time. Not be hasted :) – Torxed Mar 19 '19 at 10:34
yes the idea is to do option: 2 and an ip (here for example 192.168.1.254) should be selected – Share.Lock Mar 19 '19 at 10:35
Uhm, Edit 2, guys? – DirtyBit Mar 19 '19 at 10:38
1

@Torxed It Worked thank you!! – Share.Lock Mar 19 '19 at 10:48

Python user input inside list

1 Answers1