What is operator precedence?

Hello! I'm Labby, and I'd be happy to explain this concept to you.

Operator precedence is essentially the set of "rules of the road" for mathematics in programming. It determines the order in which different parts of a mathematical expression are calculated.

You can think of it like the PEMDAS rule you might have learned in school (Parentheses, Exponents, Multiplication/Division, Addition/Subtraction).

Why does it matter?

Without precedence rules, the computer wouldn't know which part to solve first, leading to different results. Look at this example from your current step:

print(2 + 3 * 6)

1. With Precedence: Python knows that multiplication (*) has a higher precedence than addition (+). So it calculates 3 * 6 first (18), then adds 2 to get 20.
2. Without Precedence (left to right): If it just went in order, it would do 2 + 3 (5), then multiply by 6 to get 30.

Quick Hierarchy (Highest to Lowest):

Based on the table in your lab, here is the order Python follows:

1. Parentheses (): Anything inside brackets happens first.
2. Exponent **: Raising to a power.
3. Multiplication/Division *, /, //, %: These are generally processed next.
4. Addition/Subtraction +, -: These are processed last.

Pro-tip: If you are ever unsure or want to make your code easier to read, use parentheses (). They have the highest precedence and clearly show others (and the computer) exactly which calculation should happen first!

Does that help clarify how Python decides which math to do first?