læs fra en fil, skriv til en fil.

readWrite.py

def kryptoFakeStuff(msg):
    return msg

messages=[]

with open("input.txt", "r") as file:
    for line in file:
        messages.append(line.strip())

with open("ciphers.txt", "w") as file:
    for message in messages:
        #do the thing with the thing
        cipher=kryptoFakeStuff(message)
        file.write(cipher+'\n')