ip_file_valid.py

import os.path
import sys

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

    #Prompting user for input
    ip_file = input("\n# Enter IP file path and name (e.g. D:\MyApps\myfile.txt): ")

    #Changing exception message
    #if file exists and message is printed out the screen otherwise program print another message and quit

    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()
    #assuming the file has been found and validated, we will open the file and read its content
    #Open user selected file for reading (IP addresses file)
    selected_ip_file = open(ip_file, 'r')
    
    #Starting from the beginning of the file and by not skipping any of the IP addresses
    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()
    #Here we can return the all the ip lists and then we will later iterate over this list when integrating all the modules inside the final application code.
    return ip_list