How to enter something into a program without arguments?

I am facing trouble with a code that I am working on.

#1 code

#! /usr/bin/python3
import os
import time
CardNme = input("Enter name: ")
print("Changing " + CardNme + " to monitor mode")
time.sleep(0.05)
os.system("ifconfig " + CardNme + " down && airmon-ng check kill && iwconfig " + CardNme + " mode monitor && ifconfig " + CardNme + " up")
exit(0)

#2 code

#!/usr/bin/python3
import os
import sys
import time

print("Enabling Moniter mode")
time.sleep(0.5)
os.system("./start.py")
os.system("wlan0")

Now like the situation is that I want to use #1 code in #2 code, but as the #1 code doesn’t have arguments, i cant do ./start.py -i wlan0 or anything like that. Is there any other way round? Or just arguments.

Note: I lack the knowledge to use arguments in python

Answer

Change the first script to get the interface name from sys.argv. If that’s not supplied, it can prompt.

#! /usr/bin/python3
import os
import time
import sys

if len(sys.argv) > 1:
    CardNme = sys.argv[1]
else:
    CardNme = input("Enter name: ")
print("Changing " + CardNme + " to monitor mode")
time.sleep(0.05)
os.system("ifconfig " + CardNme + " down && airmon-ng check kill && iwconfig " + CardNme + " mode monitor && ifconfig " + CardNme + " up")

Then change the second script to supply wlan0 as an argument

#!/usr/bin/python3
import os
import sys
import time

print("Enabling Moniter mode")
time.sleep(0.5)
os.system("./start.py wlan0")