Best practices for custom exceptions in Python - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to define a custom exception class named MyError.

Python

class MyError([1]):
    pass

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

ACustomError

BError

CBaseException

DException

Attempts:

3 left

💡 Hint

Common Mistakes

Inheriting from BaseException causes catching issues.

Using a non-existent base class.

Custom exceptions should inherit from Exception to be caught properly.

2fill in blank

medium

Complete the code to raise the custom exception MyError with a message.

Python

raise MyError([1])

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AMyError

BError

C"An error occurred"

DException

Attempts:

3 left

💡 Hint

Common Mistakes

Passing the exception class instead of a message.

Not passing any argument.

When raising an exception, pass a string message describing the error.

3fill in blank

hard

Fix the error in the custom exception class to properly initialize the message.

Python

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

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Asuper().__init__(message)

Bself.message = message

CException.__init__(self)

Dself.msg = message

Attempts:

3 left

💡 Hint

Common Mistakes

Only setting an attribute without calling the base constructor.

Calling base constructor without message.

Calling super().__init__(message) properly initializes the base Exception with the message.

4fill in blank

hard

Fill both blanks to create a custom exception with a code attribute and proper initialization.

Python

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

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Asuper().__init__(message)

Bself.message

Cself.code

DException.__init__(self, message)

Attempts:

3 left

💡 Hint

Common Mistakes

Not calling the base class __init__.

Assigning code to a wrong attribute name.

Use super().__init__(message) to initialize the message and assign self.code to store the code.

5fill in blank

hard

Fill all three blanks to catch the custom exception and print its message and code.

Python

try:
    raise MyError("Failed", 404)
except [1] as e:
    print(e[2])
    print(e[3])

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AMyError

B.args[0]

C.code

DException

Attempts:

3 left

💡 Hint

Common Mistakes

Catching the wrong exception type.

Trying to print message directly without args.

Accessing a non-existent attribute.

Catch the MyError exception, print the first argument (message) from args, and print the code attribute.