How tho make command in python with several condition [closed]

How do i make command for python for the condition like this

I have data :

A is 1
B is 2
C is 3 
F is none

If the algoritm is : (random ) then click, the result is A (click) then the result is B then (click) the result is F,then i stop the program because it's None

So everytime i found the result is F , the program is stop then looping until find the correct algorithm

But if i have more than 3 algoritm in 1 program how do i make the command?

anyone can help me?