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Beginner Python help: What does n-=1 do in a while loop?

Computer Science
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num = 5 if num > 2: print(num) num -= 1 print(num) output: 5,4
I thought num-=1 would subtract one from n each time through the loop, but then why no 3 printed?
actually by my reasoning if that were true it should print out the 2 as well...

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Other answers:

version 2.7 if that matters
oh never mind, I think I know
it's not even a while loop, it's an if clause, so it's only executed once. duh.

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