Unfortunately this is not how it works. We are glad to help/steer you in the right direction, however we are not going to write the code for you. You will need to put some effort, write [some] code and ask questions. Post your code in python tags, full traceback if you get any, in error tags.
Basically you need to learn:
* how to read/write from file
* create some sort of menu - take user input and eventually reject if it is not what expect (validate the input)
* you may use some sort of data structure to hold the data from the file in memory while working with them
Now I will move this thread to Homework section of the forum and we can continue the discussion there.
by the way using [some sort of] simple text file is one option. you may want to use also sqlite if you want proper database