Exception chaining in Python - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to raise a new exception while preserving the original one.

Python

try:
    x = 1 / 0
except ZeroDivisionError as e:
    raise ValueError('Invalid value') from [1]

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

ANone

BValueError

Ce

DZeroDivisionError

Attempts:

3 left

💡 Hint

Common Mistakes

Using the exception class name instead of the instance.

Using None which disables chaining.

Using a different exception variable.

The from e syntax preserves the original exception e when raising a new one.

2fill in blank

medium

Complete the code to suppress the original exception when raising a new one.

Python

try:
    int('abc')
except ValueError:
    raise RuntimeError('Conversion failed') from [1]

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

ANone

BValueError

CRuntimeError

De

Attempts:

3 left

💡 Hint

Common Mistakes

Using the original exception variable instead of None.

Not using the from keyword at all.

Using the exception class name.

Using from None disables exception chaining and hides the original exception.

3fill in blank

hard

Fix the error in the code to correctly chain exceptions.

Python

try:
    open('missing.txt')
except FileNotFoundError as err:
    raise Exception('File error') from [1]

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

Ae

Berr

CFileNotFoundError

DException

Attempts:

3 left

💡 Hint

Common Mistakes

Using the exception class name instead of the variable.

Using a variable name not defined in the except block.

Omitting the from keyword.

The variable err holds the original exception and should be used after from to chain exceptions.

4fill in blank

hard

Fill both blanks to create a dictionary of word lengths, filtering words longer than 3 characters.

Python

words = ['cat', 'house', 'dog', 'elephant']
lengths = {word: [1] for word in words if [2]

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Alen(word)

Blen(word) > 3

Cword.startswith('e')

Dword

Attempts:

3 left

💡 Hint

Common Mistakes

Using the word itself instead of its length.

Filtering by word starting letter instead of length.

Using incorrect comparison operators.

The dictionary maps each word to its length using len(word). The filter keeps words with length greater than 3.

5fill in blank

hard

Fill all three blanks to create a dictionary with uppercase keys and values greater than 0.

Python

data = {'a': 1, 'b': -2, 'c': 3}
result = { [1]: [2] for k, v in data.items() if v [3] 0 }

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

Ak.upper()

Bv

C>

Dk

Attempts:

3 left

💡 Hint

Common Mistakes

Using original keys without uppercase.

Filtering with wrong comparison operator.

Swapping keys and values.

The dictionary comprehension uses uppercase keys with k.upper(), values v, and filters values greater than zero.