ip_file_valid.py

import os.path
import sys

# Checking IP address file and content validity
def ip_file_valid():

    # Prompting user for file with IPs of devices
    ip_file = input("\n# Enter IP file path and name (e.g. ~/device-ips.txt): ")

    # Check file exists at specified location
    if os.path.isfile(ip_file) == True:
        print("\n* IP file is valid :)\n")
    
    else:
        print("\n* File {} does not exist :( Please check and try again.\n".format(ip_file))
        sys.exit()

    # Open user selected file for reading(r) IP addresses from file
    selected_ip_file = open(ip_file, 'r')
    
    # Starting from the beginning of the file
    selected_ip_file.seek(0)
    
    # Reading each line (IP address) in the file
    ip_list = selected_ip_file.readlines()
    
    #Closing the file
    selected_ip_file.close()

    # return the list of device IPs read from TXT file as a list
    return ip_list