Type casting with astype() in NumPy - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to convert the NumPy array to float type using astype().

NumPy

import numpy as np
arr = np.array([1, 2, 3])
arr_float = arr.[1](float)
print(arr_float)

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

Aastype

Bconvert

Ctofloat

Dcast

Attempts:

3 left

💡 Hint

Common Mistakes

Using a method name that does not exist like 'convert' or 'cast'.

Trying to change type by assignment instead of using a method.

The astype() method is used to cast a NumPy array to a different type.

2fill in blank

medium

Complete the code to convert the integer array to string type using astype().

NumPy

import numpy as np
arr = np.array([10, 20, 30])
arr_str = arr.[1](str)
print(arr_str)

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Aastype

Bto_str

Cconvert

Dcast

Attempts:

3 left

💡 Hint

Common Mistakes

Using a non-existent method like 'to_str'.

Trying to convert by casting without a method.

Use astype(str) to convert the array elements to strings.

3fill in blank

hard

Fix the error in the code to convert the float array to integer type using astype().

NumPy

import numpy as np
arr = np.array([1.5, 2.7, 3.1])
arr_int = arr.[1](int)
print(arr_int)

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Acast

Bastypee

Cconvert

Dastype

Attempts:

3 left

💡 Hint

Common Mistakes

Misspelling the method name as 'astypee'.

Using a method that does not exist.

The correct method name is astype. Misspelling it causes an error.

4fill in blank

hard

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

NumPy

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

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Aword

Blen

Cwords

Ditem

Attempts:

3 left

💡 Hint

Common Mistakes

Using different variable names inconsistently.

Using the list name instead of the loop variable inside len().

Use the same variable word as the key and inside len() to get the length of each word.

5fill in blank

hard

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

NumPy

import numpy as np
words = ['apple', 'bat', 'carrot', 'dog']
lengths = { [1] : np.array([len([2])]).[3](float)[0] for [2] in words if len([2]) > 3 }
print(lengths)

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

Aword.upper()

Bword

Castype

Dwords

Attempts:

3 left

💡 Hint

Common Mistakes

Using the list name instead of the loop variable.

Forgetting to convert length to float.

Using wrong method names.

The key is the uppercase word using word.upper(), the loop variable is word, and the length is converted to float using astype(float).