2.5. How Expressions are Evaluated

The order that expressions are executed is the same as it is in math. You probably learned this ordering as PEMDAS (Parentheses, Exponents, Multiply/Divide, Add/Subtract) and is shown in the table below from highest precedence to lowest. If two symbols have the same precedence they are evaluated from left to right.

Operator	Name
-x	Negation
x ** y	Exponentiation
x * y x / y x % y	Multiplication, Division, and Modulo
x + y x - y	Addition and Subtraction

What is printed when you click on the Run button in the code below? Try evaluating it by hand before running the program to check yourself.

result = 4 ** 2 + -1 * 3 print(result)

You can change the default order by adding parentheses around part of an expression. Whatever math is inside the parentheses is done (using the same order of operations) before any operations outside the parentheses are done.

What is printed when you click on the Run button in the code below? Try evaluating it by hand before running the program to check yourself.

result = 4 ** (2 + -1) * -3 print(result)

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