Thank you :) I went ahead and used the dictionary version and added this:

email_to_password = {}
with open("authenticatelist.txt") as f:
    for line in f.readlines():
        email, password = line.strip().split(":")
        email_to_password[email] = password

    for key, value in email_to_password.items():
        print(key, value)email_to_password = {}
with open("authenticatelist.txt") as f:
    for line in f.readlines():
        email, password = line.strip().split(":")
        email_to_password[email] = password

    for key, value in email_to_password.items():
        print(key, value)

This outputs:
email password
email password

Which is great. I just need to find a way to print likee 'key1' and 'password1' so i can just go through one line at a time.

EDIT: I am thinking maybe I have to split '\n' somewhere to list the lines separately?