Logical operations (and, or, not) in NumPy - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create a boolean array where values are True if elements in array 'a' are greater than 5.

NumPy

import numpy as np

a = np.array([3, 7, 2, 9, 5])
result = a [1] 5

Drag options to blanks, or click blank then click option'

A>

B<

C==

D!=

Attempts:

3 left

💡 Hint

Common Mistakes

Using '<' instead of '>' which selects smaller values.

Using '==' which checks for equality, not greater than.

The '>' operator compares each element of 'a' to 5, returning True where the element is greater than 5.

2fill in blank

medium

Complete the code to find elements in 'a' that are greater than 2 and less than 8 using logical operations.

NumPy

import numpy as np

a = np.array([1, 3, 5, 7, 9])
result = (a > 2) [1] (a < 8)

Drag options to blanks, or click blank then click option'

Aor

Band

C|

D&

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'and' which does not work element-wise on numpy arrays.

Using '|' which is for OR operation.

In numpy, '&' is used for element-wise logical AND between boolean arrays.

3fill in blank

hard

Fix the error in the code to correctly apply logical OR between two conditions on numpy arrays.

NumPy

import numpy as np

a = np.array([1, 4, 6])
b = np.array([3, 5, 2])
result = (a > 3) [1] (b < 5)

Drag options to blanks, or click blank then click option'

Aor

Band

C|

D&

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'or' which causes a ValueError with numpy arrays.

Using '&' which is for AND, not OR.

Use '|' for element-wise logical OR in numpy arrays, not the Python 'or'.

4fill in blank

hard

Fill both blanks to create a dictionary comprehension that maps words to True if their length is greater than 3 and the word contains letter 'a'.

NumPy

words = ['cat', 'dog', 'apple', 'bat']
result = {word: (len(word) [1] 3) [2] ('a' in word) for word in words}

Drag options to blanks, or click blank then click option'

A>

Band

C&

D|

Attempts:

3 left

💡 Hint

Common Mistakes

Using '&' which is a bitwise operator and not suitable here.

Using '|' which means OR, not AND.

Use '>' to check length and 'and' to combine conditions in a dictionary comprehension.

5fill in blank

hard

Fill all three blanks to create a dictionary comprehension that maps words to True if the word starts with 'b', does not contain 'e', and has length less than 5.

NumPy

words = ['bat', 'bee', 'ball', 'cat']
result = {word: (word[1]'b') [2] ([3]('e' in word)) and len(word) < 5 for word in words}

Drag options to blanks, or click blank then click option'

A.startswith(

Band

Cnot

Dor

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'or' instead of 'and' which changes logic.

Omitting 'not' which reverses the condition.

Use '.startswith(' to check start, 'and' to combine conditions, and 'not' to negate the 'in' check.