Why NumPy over Python lists - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to import the NumPy library with its common alias.

NumPy

import [1] as np

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Ascipy

Bpandas

Cmatplotlib

Dnumpy

Attempts:

3 left

💡 Hint

Common Mistakes

Importing the wrong library like pandas or matplotlib.

Not using the alias 'np' which is a common convention.

NumPy is imported using the alias np for easy access to its functions.

2fill in blank

medium

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

NumPy

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

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Alist

Barray

Cmatrix

Dseries

Attempts:

3 left

💡 Hint

Common Mistakes

Using np.list() which does not exist.

Confusing arrays with matrices or series.

The np.array() function converts a Python list into a NumPy array.

3fill in blank

hard

Fix the error in the code to calculate the mean of a NumPy array.

NumPy

mean_value = arr.[1]()

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Amean

Baverage

Cmedian

Dmode

Attempts:

3 left

💡 Hint

Common Mistakes

Using average() which is not a NumPy array method.

Confusing mean with median or mode.

The correct method to calculate the average value of a NumPy array is mean().

4fill in blank

hard

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

NumPy

{word: [1] for word in words if [2] > 3}

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Alen(word)

Bword

Dword.length

Attempts:

3 left

💡 Hint

Common Mistakes

Using word.length which is not valid in Python.

Using the word itself instead of its length.

The dictionary comprehension uses len(word) to get the length and filters words with length greater than 3.

5fill in blank

hard

Fill all three blanks to create a dictionary comprehension that maps uppercase words to their counts only if the count is greater than 0.

NumPy

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

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Aword.upper()

Bcount

Cword

Ddata

Attempts:

3 left

💡 Hint

Common Mistakes

Using the original word as key without converting to uppercase.

Mixing up keys and values in the comprehension.

The comprehension maps the uppercase version of each word to its count, filtering counts greater than zero.