Operator precedence and evaluation order in Python - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to calculate the correct result using operator precedence.

Python

result = 3 + 4 * [1]

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A1

B2

C5

D0

Attempts:

3 left

💡 Hint

Common Mistakes

Adding 3 + 4 first, then multiplying by the number.

Multiplication (*) has higher precedence than addition (+), so 4 * 5 is calculated first, then 3 is added.

2fill in blank

medium

Complete the code to get the correct boolean result using operator precedence.

Python

result = True or False and [1]

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ATrue

B0

CNone

DFalse

Attempts:

3 left

💡 Hint

Common Mistakes

Evaluating True or False first.

In Python, and has higher precedence than or, so False and False is evaluated first, resulting in False. Then True or False is True.

3fill in blank

hard

Fix the error in the expression to get the correct result.

Python

result = (10 - 3) [1] 2 ** 3

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A*

B-

C+

D/

Attempts:

3 left

💡 Hint

Common Mistakes

Using + or - instead of * changes the result.

Exponentiation (**) has higher precedence than multiplication (*), so 2 ** 3 is calculated first, then multiplied by (10 - 3).

4fill in blank

hard

Fill both blanks to create a dictionary comprehension that includes only even squares.

Python

squares = {x: x[1]2 for x in range(1, 6) if x [2] 2 == 0}

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A**

B%

C//

D+

Attempts:

3 left

💡 Hint

Common Mistakes

Using // instead of % for checking even numbers.

The ** operator is used for exponentiation to square the number. The modulo operator % checks if the number is even by testing if the remainder when divided by 2 is zero.

5fill in blank

hard

Fill all three blanks to create a filtered dictionary with uppercase keys and values greater than zero.

Python

result = [1]: [2] for [3], v in data.items() if v > 0}

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Ak.upper()

Bv

Ck

Ditem

Attempts:

3 left

💡 Hint

Common Mistakes

Using item instead of k as the loop variable.

The key k is converted to uppercase with k.upper(). The value v is used as the dictionary value. The loop variable for keys is k.