Matching exception messages in PyTest - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to check that a ValueError is raised.

PyTest

import pytest

def test_value_error():
    with pytest.raises([1]):
        int('abc')

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

AValueError

BKeyError

CTypeError

DIndexError

Attempts:

3 left

💡 Hint

Common Mistakes

Using the wrong exception type like TypeError instead of ValueError.

The pytest.raises() function expects the exception class to check. Here, int('abc') raises a ValueError.

2fill in blank

medium

Complete the code to check that the exception message contains 'invalid literal'.

PyTest

import pytest

def test_value_error_message():
    with pytest.raises(ValueError, match=[1]):
        int('abc')

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

A'KeyError'

B'TypeError'

C'invalid literal'

D'IndexError'

Attempts:

3 left

💡 Hint

Common Mistakes

Using the exception type name instead of a message substring for match.

The match argument expects a string or regex pattern to match the exception message. The message for int('abc') contains 'invalid literal'.

3fill in blank

hard

Fix the error in the code to correctly match the exception message.

PyTest

import pytest

def test_zero_division():
    with pytest.raises(ZeroDivisionError, match=[1]):
        1 / 0

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

A'float division by zero'

B'division zero'

C'ZeroDivisionError'

D'division by zero'

Attempts:

3 left

💡 Hint

Common Mistakes

Using the exception class name as the match string instead of the message.

The exception message for dividing by zero is 'division by zero'. The match argument must match this exact substring.

4fill in blank

hard

Fill both blanks to check for a KeyError with message 'missing'.

PyTest

import pytest

def test_key_error():
    with pytest.raises([1], match=[2]):
        d = {}
        d['missing']

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

AKeyError

B'missing key'

C'missing'

DValueError

Attempts:

3 left

💡 Hint

Common Mistakes

Using the wrong exception type or incorrect message string.

The code raises a KeyError when accessing a missing dictionary key. The message is the key name, here 'missing'.

5fill in blank

hard

Fill all three blanks to check for an IndexError with message 'list index out of range'.

PyTest

import pytest

def test_index_error():
    with pytest.raises([1], match=[2]):
        lst = [1, 2, 3]
        _ = lst[[3]]

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

AIndexError

B'list index out of range'

C5

DKeyError

Attempts:

3 left

💡 Hint

Common Mistakes

Using the wrong exception type or wrong index number.

Accessing index 5 in a list of length 3 raises IndexError with message 'list index out of range'.