I need a function that will create and store usernames and passwords for different students. Their programme should ask the user for their name and age and a username should be created, consisted of their name and age eg. Jack16. They then can make up their own password which then will be stored in an external file using pickle maybe. The programme should then be able to check if the username and password is valid from the external list in a log in section. If they are valid they should be allowed in. I'm sort of stuck on this and would appreciate any help.