store IP and subnet mask number in a variable and edit on it in Python

Question

I want to code an application that help me to determine class of IP and edit on it like if I'm using IP class a "10.0.0.0" with subnet mask 255.0.0.0 I want to let user input his IP AND SUBNET MASK as above and I make an equation to inform him how many IPs he can use, during my search I got this code

import sys

sys.stdout.write("Enter IP address: ")
sys.stdout.flush()
ip = sys.stdin.readline()
print("you entered: " + ip)

but when I use it I couldn't make any edit on the ip by that code

import sys

sys.stdout.write("Enter IP address: ")
sys.stdout.flush()
ip = sys.stdin.readline()
a = ip + 1
print("you entered: " + ip + "and your IP will be : " + a)

it shows that error : TypeError: must be str, not int

finally I want to make that number is applicable to edit on it, and kindly explain you're code to help me understand it correctly. thanks in advance

Answer 1

With Python 3.3 you can make use of the ipaddress — IPv4/IPv6 manipulation library

import sys
import ipaddress

sys.stdout.write("Enter IP address: ")
sys.stdout.flush()
ip = sys.stdin.readline().strip()   # remove the trailing '\n'
assigned_ip = ipaddress.IPv4Address(ip) + 1
print("You entered: " + ip + " and your IP will be: " + str(assigned_ip))

Output:

Enter IP address: 192.168.1.0
You entered: 192.168.1.0 and your IP will be: 192.168.1.1