When operators from different families mix, precedence decides the order. The full pecking order, highest to lowest:
1. Parentheses ()
2. Exponent **
3. Multiply, divide, modulo * / % //
4. Add, subtract + -
5. Comparisons > < >= <= == !=
6. NOT
7. AND
8. OR
✦ The practical rule
Arithmetic happens before comparison, and comparison happens before logic. That's why age >= 18 and has_ticket works without parentheses, the comparison resolves to a Boolean first, then AND combines. When you're unsure, add parentheses. They cost nothing and they make intent obvious to the next reader, who is often you in six months.
EXAMPLE
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YOUR TURN
Your turn → Line 3 resolves in three stages: arithmetic (10-2=8), then two comparisons (8>3 is True, 5<8 is True), then AND. Add parentheses to line 1 so the addition happens first and it prints 16.
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Syntax has to be exact. Every quote, bracket and parenthesis needs its partner, and in Python the spaces at the start of a line count. One slip and the program won't run; the message will say where.
EXAMPLE
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YOUR TURN
Your turn → Write a check that lets someone in when they have a ticket AND are either a member OR over 65. Use parentheses so the or is grouped together, and try it with a few different values.
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Syntax has to be exact. Every quote, bracket and parenthesis needs its partner, and in Python the spaces at the start of a line count. One slip and the program won't run; the message will say where.
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