Raising exceptions in Python - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to raise a ValueError with a message.

Python

def check_positive(number):
    if number <= 0:
        raise [1]("Number must be positive")

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

AValueError

Bprint

Creturn

DException

Attempts:

3 left

💡 Hint

Common Mistakes

Using print instead of raise

Using return instead of raise

Raising a generic Exception instead of ValueError

The raise keyword is used to throw an exception. Here, ValueError is the correct exception type to indicate a wrong value.

2fill in blank

medium

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

Python

class MyError(Exception):
    pass

def test():
    raise [1]("This is a custom error")

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

AMyError

BTypeError

CValueError

DException

Attempts:

3 left

💡 Hint

Common Mistakes

Raising a built-in exception instead of the custom one

Forgetting to define the custom exception class

Using the wrong exception class name

To raise a custom exception, use the class name defined for it. Here, MyError is the custom exception class.

3fill in blank

hard

Fix the error in raising an exception with a message.

Python

def check_age(age):
    if age < 18:
        raise ValueError[1]"Age must be at least 18"

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

A:

B,

C[

D(

Attempts:

3 left

💡 Hint

Common Mistakes

Using a comma instead of parentheses

Using a colon or bracket instead of parentheses

Not enclosing the message in quotes

When raising an exception with a message, the message must be inside parentheses after the exception type.

4fill in blank

hard

Fill both blanks to raise a TypeError with a custom message.

Python

def check_string(value):
    if not isinstance(value, str):
        raise [1]([2])

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

ATypeError

B"Value must be a string"

C"Invalid type"

DValueError

Attempts:

3 left

💡 Hint

Common Mistakes

Using ValueError instead of TypeError

Not putting the message inside parentheses

Using a variable instead of a string message

The raise statement needs the exception type and the message inside parentheses. Here, TypeError and a descriptive string message are correct.

5fill in blank

hard

Fill all three blanks to raise a RuntimeError with a formatted message including a variable.

Python

def check_status(status):
    if status != 'ok':
        raise [1](f"Status is [2] but expected [3]")

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

ARuntimeError

Bstatus

C'ok'

DValueError

Attempts:

3 left

💡 Hint

Common Mistakes

Using the wrong exception type

Not using f-string syntax correctly

Forgetting to include the variable in the message

Use RuntimeError to raise the exception. The message uses an f-string to include the variable status and the expected value 'ok'.