Why custom exceptions are needed in Python - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to raise a built-in exception when a number is negative.

Python

if number < 0:
    raise [1]("Negative number not allowed")

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

AValueError

BCustomError

CException

DTypeError

Attempts:

3 left

💡 Hint

Common Mistakes

Using a custom exception when a built-in one fits.

Using TypeError which is for wrong data types.

ValueError is the built-in exception used to indicate a wrong value, such as a negative number where it is not allowed.

2fill in blank

medium

Complete the code to define a custom exception named MyError.

Python

class [1](Exception):
    pass

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AError

BMyError

CCustomException

DException

Attempts:

3 left

💡 Hint

Common Mistakes

Using Exception as the class name.

Not inheriting from Exception.

Custom exceptions are defined by creating a new class that inherits from Exception. Here, MyError is the custom exception name.

3fill in blank

hard

Fix the error in raising the custom exception with a message.

Python

raise [1]("This is a custom error message")

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AError

BCustomError

CMyError

DException

Attempts:

3 left

💡 Hint

Common Mistakes

Using a generic Exception instead of the custom one.

Using a wrong class name.

To raise the custom exception, use its class name MyError, which was defined earlier.

4fill in blank

hard

Fill both blanks to create a dictionary comprehension that includes only keys with values greater than 10.

Python

filtered = {k: v for k, v in data.items() if v [1] 10 and isinstance(v, [2])}

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A>

Bint

C<

Dstr

Attempts:

3 left

💡 Hint

Common Mistakes

Using '<' instead of '>' for comparison.

Checking for str instead of int.

The condition filters values greater than 10 and checks if the value is an integer.

5fill in blank

hard

Fill all three blanks to create a custom exception class with a message attribute and raise it.

Python

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

raise [3]("Custom error occurred")

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ACustomError

Bmsg

Dmessage

Attempts:

3 left

💡 Hint

Common Mistakes

Using different names for class and raise.

Using 'msg' instead of 'message' attribute.

The class name is CustomError. The attribute to store the message is 'message'. The exception is raised using the class name CustomError.