Operator precedence and evaluation order in Python - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is operator precedence in Python?

Operator precedence determines the order in which different operators in an expression are evaluated. Operators with higher precedence are evaluated before those with lower precedence.

beginner

Which operator has higher precedence: multiplication (*) or addition (+)?

Multiplication (*) has higher precedence than addition (+), so it is evaluated first in an expression without parentheses.

intermediate

What does evaluation order mean in Python expressions?

Evaluation order is the sequence in which parts of an expression are calculated. Even if operators have the same precedence, Python evaluates them from left to right (for most operators).

beginner

How do parentheses affect operator precedence and evaluation order?

Parentheses have the highest precedence. Expressions inside parentheses are evaluated first, overriding the normal precedence rules.

beginner

Consider the expression: 3 + 4 * 2. What is the result and why?

The result is 11 because multiplication (*) has higher precedence than addition (+). So, 4 * 2 is evaluated first (8), then 3 + 8 equals 11.

In the expression 5 + 3 * 2, which operation is performed first?

A Multiplication

B Addition

C Both at the same time

D Depends on the order written

Multiplication has higher precedence than addition, so 3 * 2 is done first.

What is the result of (5 + 3) * 2?

A 16

B 11

C 10

D 13

Parentheses are evaluated first: 5 + 3 = 8, then multiplied by 2 equals 16.

Which operator has the highest precedence in Python?

A Multiplication (*)

B Addition (+)

C Parentheses ()

D Exponentiation (**)

Parentheses have the highest precedence and force evaluation inside them first.

If two operators have the same precedence, how does Python decide which to evaluate first?

A Depends on the operator

B Randomly

C Right to left

D Left to right

Python evaluates operators with the same precedence from left to right, except for some like exponentiation.

What is the result of 2 ** 3 ** 2 in Python?

A 64

B 512

C 256

D 16

Exponentiation is right-associative, so 3 ** 2 = 9 first, then 2 ** 9 = 512.

Explain how operator precedence and evaluation order work together in Python expressions.

Think about how Python decides what to calculate first in a math expression.

Describe how parentheses change the way Python evaluates an expression.

Imagine grouping parts of a math problem to solve them first.