PCEP Operator Precedence and Binding 3

Question 1

What is the result of `-(2 ** 2)`?

Accepted Answer

-4

Answer

Exponentiation `**` has higher precedence than unary minus, so `2**2=4` first, then `-4`.

Question 2

Which expression is evaluated first in `a = 1 + 2 * 3 ** 1 - 4 // 2`?

Accepted Answer

3 ** 1

Answer

Exponentiation `**` has the highest precedence among arithmetic operators, so `3**1` is evaluated first.

Question 3

What is the value of `5 - 2 - 1`?

Accepted Answer

2

Answer

Subtraction is left-associative: `(5-2)-1 = 3-1 = 2`.

Question 4

What does `1 < 2 < 3` evaluate to in Python?

Accepted Answer

True

Answer

Python supports chained comparisons; `1 < 2 < 3` is equivalent to `(1 < 2) and (2 < 3)` which is True.

Question 5

What is the result of `8 / 2 * 2`?

Accepted Answer

8.0

Answer

`/` and `*` have the same precedence and are left-associative: `(8/2)*2 = 4.0*2 = 8.0`.

(PCEP) Certified Entry-Level Python Programmer Practice Test