append

import os

path = "payload-list"

def isListExists(port):
    global path
    with open(path, "r") as f:
        files = f.readlines()

    for fi in files:
        if port in fi.strip():
            return True
        else:
            return False
    return False

def appendList(port):
    global path
    if os.path.exists(path):
        if isListExists(port) == False:
            with open("payload-list", "a") as file:
                file.write("{}\n".format(port))
    else:
        createList()
        appendList(port)
def createList():
    global path
    f = open(path, "w+")
    f.close()


appendList("4445")