Question

This is a sort of beginner question but I couldn’t find a good answer.

I have:

self.date = ( self.date + 1 ) % 31

So the results start at 0 1 2 3 … and ends in 29 30 0 1 ….

How do I shift it such that it starts at 1 2 3 4 and results in 30 31 1 2 3 … with as clean as a syntax as possible?

Answer 1

self.date = (self.date % 31) + 1

I think this is what you mean.

EDIT: I saw your comment on the other answer, and here’s an explanation of what you’re doing:

(self.date % 31) means to take the value of date and find the remainder when you divide by 31 (which you know). If you use self.date +1 % 31, then starting with date = 0 you will get 1,2,3..30. When date=30, it will end up as 30+1 % 31, or 31 % 31 which is 0.

If you add the 1 after, at date=30 you will have 30 % 31, still giving you 30, then +1 to give the 30,31,1 you want.