How to convert CIDR prefix to netmask?

Question

Python

Please help solve this problem, you need to add the code so that the entered mask, together with the ip, for example, 192.168.75.2/24 or 192.168.75.2/3, is converted to 192.168.75.2 255.255.255.0 and the like
through a bunch of ifs, somehow I don’t really want to do this I found this code on the internet but it doesn't seem to work.

import socket
import struct

def cidr_to_netmask(cidr):
    network, net_bits = cidr.split('/')
    host_bits = 32 - int(net_bits)
    netmask = socket.inet_ntoa(struct.pack('!I', (1 << 32) - (1 << host_bits)))
    return network, netmask

Below is what I posted, please help me finish it

import struct
import socket


print ("enter IP/Mask: ")
StatIP = input()
print ("enter Gateway: ")
StatGA = input()
net_bits = StatIP.split('/')

Answer 1

I found this code but it doesn't work

Why did you decide that it is not working?

Answer 2

import ipaddress

StatIP =  input("enter IP/Mask: ")
cidr = ipaddress.ip_interface(StatIP)
print(cidr.ip, cidr.netmask)