Creating exception classes in Python - Interactive Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to define a new exception class named MyError that inherits from Exception.

Python

class MyError([1]):
    pass

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

ABaseException

BException

CError

Dobject

Attempts:

3 left

💡 Hint

Common Mistakes

Inheriting from 'object' instead of 'Exception'.

Using 'Error' which is not a built-in base class.

To create a custom exception, you inherit from the built-in Exception class.

2fill in blank

medium

Complete the code to raise the custom exception MyError with the message 'Oops!'.

Python

raise [1]('Oops!')

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AMyError

BException

CError

DBaseException

Attempts:

3 left

💡 Hint

Common Mistakes

Raising the base Exception instead of the custom one.

Using a class name that was not defined.

You raise your custom exception class by calling it with a message.

3fill in blank

hard

Fix the error in the code to correctly define a custom exception MyError that inherits from Exception.

Python

class MyError(Exception):
    def __init__(self, message):
        super().[1](message)

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

A__init__

Binit

Cconstructor

Dsuper_init

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'init' without underscores.

Using a made-up method name like 'constructor'.

The correct method name to call the parent constructor is __init__.

4fill in blank

hard

Fill both blanks to define a custom exception MyError that stores a message and returns it when converted to string.

Python

class MyError(Exception):
    def __init__(self, [1]):
        self.[2] = [1]

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

Amessage

Bmsg

Cerror

Dtext

Attempts:

3 left

💡 Hint

Common Mistakes

Using different names for parameter and attribute causing errors.

Using undefined variable names.

The parameter and the attribute should have the same name to store the message.

5fill in blank

hard

Fill both blanks to complete the __str__ method that returns the error message of MyError.

Python

class MyError(Exception):
    def __init__(self, message):
        self.message = message
    def __str__(self):
        return [1].[2]

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

Aself

Bmessage

Cmsg

Dtext

Attempts:

3 left

💡 Hint

Common Mistakes

Returning undefined variables.

Not using 'self' to access attributes.

The __str__ method returns self.message to show the error message.