Chained equality comparison

Question

Accepted Answer

Chaining works with == too: a == b == c means 'a == b AND b == c'. All three are 1, so that's True. Adding == 2 extends the chain: a == b == c == 2 means every adjacent pair must be equal - but c (which is 1) is not equal to 2, so the result is False. This is cleaner than writing a == b and b == c yourself, and Python only evaluates each subexpression once.