Vectorized operations vs loops in Data Analysis Python - Interactive Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create a NumPy array from a Python list.

Data Analysis Python

import numpy as np
numbers = [1, 2, 3, 4, 5]
arr = np.[1](numbers)

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Amatrix

Blist

Carray

Drange

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'list' instead of 'array' which is not a NumPy function.

Using 'matrix' which is a different NumPy type.

Using 'range' which creates a range object, not an array.

Use np.array() to convert a list into a NumPy array for vectorized operations.

2fill in blank

medium

Complete the code to add 5 to each element in the NumPy array using vectorized operation.

Data Analysis Python

import numpy as np
arr = np.array([1, 2, 3])
result = arr [1] 5

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A+

B*

C-

D/

Attempts:

3 left

💡 Hint

Common Mistakes

Using '*' which multiplies instead of adds.

Using '-' which subtracts instead of adds.

Using '/' which divides instead of adds.

Adding 5 to each element uses the + operator in vectorized form.

3fill in blank

hard

Fix the error in the loop that adds 5 to each element in the list.

Data Analysis Python

numbers = [1, 2, 3]
for i in range(len(numbers)):
    numbers[i] = numbers[i] [1] 5

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A*

B/

C-

D+

Attempts:

3 left

💡 Hint

Common Mistakes

Using '*' which multiplies instead of adds.

Using '-' which subtracts instead of adds.

Using '/' which divides instead of adds.

The loop should add 5 to each element using the '+' operator.

4fill in blank

hard

Fill both blanks to create a dictionary with words as keys and their lengths as values, but only for words longer than 3 letters.

Data Analysis Python

words = ['apple', 'bat', 'carrot', 'dog']
lengths = { [1] : len([2]) for [1] in words if len([1]) > 3 }

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Aword

Bwords

Clen

Dlength

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'words' instead of 'word' which is the loop variable.

Using 'len' or 'length' as variable names which are functions or undefined.

Use the variable word as the key and to calculate length for each word in the list.

5fill in blank

hard

Fill all three blanks to create a dictionary with uppercase words as keys and their lengths as values, but only for words longer than 3 letters.

Data Analysis Python

words = ['apple', 'bat', 'carrot', 'dog']
lengths = { [1] : [2] for [3] in words if len([3]) > 3 }

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Aword.upper()

Blen(word)

Cword

Dwords

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'words' as loop variable which is the list, not each item.

Not converting the key to uppercase.

Using incorrect expressions for length or key.

Use word.upper() as the key, len(word) as the value, and word as the loop variable.