Extending built-in exceptions in Python - Interactive Code 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'

AError

BException

CBaseException

DValueError

Attempts:

3 left

💡 Hint

Common Mistakes

Using a non-existent class name.

Inheriting from a specific error like ValueError instead of Exception.

The new exception class should inherit from Exception to behave like a standard error.

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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AException

BError

CMyError

DValueError

Attempts:

3 left

💡 Hint

Common Mistakes

Raising the base Exception instead of the custom one.

Using a built-in error like ValueError by mistake.

To raise the custom exception, use its class name MyError.

3fill in blank

hard

Fix the error in the custom exception class by correctly calling the base class constructor.

Python

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

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Asuper().__init__

Bself.__init__

CException.__init__

Dinit

Attempts:

3 left

💡 Hint

Common Mistakes

Calling self.__init__ causes infinite recursion.

Using just init without context.

Use super().__init__(message) to properly call the base class constructor.

4fill in blank

hard

Fill both blanks to add a custom attribute code to the exception and initialize it.

Python

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

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Acode

Bmsg

Dmessage

Attempts:

3 left

💡 Hint

Common Mistakes

Using different names for parameter and attribute.

Forgetting to assign the attribute.

The constructor takes code as a parameter and assigns it to self.code.

5fill in blank

hard

Fill all three blanks to create a dictionary comprehension that maps error codes to messages for errors with code greater than 100.

Python

errors = {
    [1]: [2] for [3] in error_list if [3].code > 100
}

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Aerror.code

Berror.message

Cerror

Derr

Attempts:

3 left

💡 Hint

Common Mistakes

Using the wrong variable name in the loop.

Swapping keys and values in the dictionary.

The comprehension uses error as the loop variable, maps error.code to error.message for codes above 100.