Why interop matters in NumPy - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

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

NumPy

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

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

Aarray

Blist

Casarray

Dfromlist

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'list' which is not a NumPy function.

Using 'fromlist' which does not exist in NumPy.

Confusing 'asarray' which also works but is not the simplest here.

The np.array() function converts a Python list into a NumPy array, enabling efficient numerical operations.

2fill in blank

medium

Complete the code to convert a NumPy array back to a Python list.

NumPy

import numpy as np
arr = np.array([5, 6, 7])
py_list = arr.[1]()
print(py_list)

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

Atolist

Btolist()

Cto_list

Dlist

Attempts:

3 left

💡 Hint

Common Mistakes

Forgetting parentheses and writing 'tolist' without ().

Using 'to_list' which is not a valid method.

Trying to use the built-in 'list' function directly on the array.

The tolist() method converts a NumPy array into a Python list. The parentheses are required to call the method.

3fill in blank

hard

Fix the error in the code to create a NumPy array from a list of lists.

NumPy

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

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

Aarray

Btolist

Cfromlist

Dasarray

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'fromlist' which does not exist in NumPy.

Using 'tolist' which converts arrays to lists, not the other way.

Confusing 'asarray' which works but 'array' is preferred here.

The np.array() function correctly creates a 2D NumPy array from a list of lists. fromlist is not a valid NumPy function.

4fill in blank

hard

Fill both blanks to create a NumPy array and then convert it to a Python list.

NumPy

import numpy as np
py_list = [[10, 20], [30, 40]]
arr = np.[1](py_list)
converted_list = arr.[2]()
print(converted_list)

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

Aarray

Btolist

Ctolist()

Dasarray

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'asarray' instead of 'array' for creation.

Using 'tolist' without parentheses.

Mixing up the order of conversion.

First, np.array() creates a NumPy array from the Python list. Then, tolist() converts the array back to a Python list.

5fill in blank

hard

Fill all three blanks to create a NumPy array, convert it to a list, and then create a new array from that list.

NumPy

import numpy as np
original_list = [1, 2, 3]
arr1 = np.[1](original_list)
list_from_arr = arr1.[2]()
arr2 = np.[3](list_from_arr)
print(arr2)

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

Aarray

Btolist()

Dasarray

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'array' instead of 'asarray' for the first blank.

Forgetting parentheses in 'tolist()'.

Using 'asarray' instead of 'array' for the last blank.

np.asarray() creates an array from the list. Then tolist() converts it back to a Python list. Finally, np.array() creates a new array from that list.