Why custom ufuncs matter in NumPy - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create a NumPy array.

NumPy

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

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Atuple

Blist

Carray

Dmatrix

Attempts:

3 left

💡 Hint

Common Mistakes

Using Python list instead of np.array.

Trying to use np.list which does not exist.

Use np.array to create a NumPy array from a list.

2fill in blank

medium

Complete the code to define a simple custom ufunc using NumPy's vectorize.

NumPy

import numpy as np
@np.vectorize
def square(x):
    return x [1] x

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A*

B-

C+

D/

Attempts:

3 left

💡 Hint

Common Mistakes

Using addition instead of multiplication.

Using division or subtraction which do not square the number.

The function squares the input by multiplying it by itself using *.

3fill in blank

hard

Fix the error in the custom ufunc that adds 10 to each element.

NumPy

import numpy as np
@np.vectorize
def add_ten(x):
    return x [1] 10

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A/

B-

C*

D+

Attempts:

3 left

💡 Hint

Common Mistakes

Using subtraction instead of addition.

Using multiplication or division which changes the value differently.

To add 10 to each element, use the addition operator +.

4fill in blank

hard

Fill both blanks to create a dictionary comprehension that maps words to their lengths only if length is greater than 3.

NumPy

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

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Alen(word)

B>

C<

Dword

Attempts:

3 left

💡 Hint

Common Mistakes

Using the word itself as the value instead of its length.

Using < instead of > in the condition.

The dictionary maps each word to its length using len(word), and filters words with length greater than 3 using >.

5fill in blank

hard

Fill all three blanks to create a dictionary comprehension that maps uppercase words to their lengths if length is greater than 4.

NumPy

words = ['apple', 'bat', 'carrot', 'dog']
result = { [1]: [2] for w in words if len(w) [3] 4 }

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Aw.upper()

Blen(w)

C>

Dw.lower()

Attempts:

3 left

💡 Hint

Common Mistakes

Using lowercase instead of uppercase for keys.

Using < instead of > in the condition.

Mapping words instead of their lengths.

The dictionary comprehension maps each word in uppercase (w.upper()) to its length (len(w)) only if the length is greater than 4 (>).