Learning Python 3

Hello World!! I am a computer science major and will be starting my first programming class in 3 weeks. The class focuses on Python and I believe we will be using Python 3. In the meantime I have started learning Python 3 on my own and I am developing a small program to help my classmates in calculus 1 next semester. Everything is going fine with the program so far but I was wondering if anyone had any advice on how to code a user name and password setup feature into a program. I have already set up a user name and password for the program but thus far it is only my username and password that I have written into the code.
Any help would be greatly appreciated.

Thanks,

Learin