b1.author is 'Unknown', b2.author is 'Alice'

Both b1.author and b2.author are 'Unknown'

b1.author is 'Python 101', b2.author is 'Learn AI'

b1.author is None, b2.author is 'Alice'

Solution:Step 1: Understand default parameter usageThe author parameter has a default value 'Unknown', used if no argument is given.Step 2: Check object creationb1 is created with only title, so author defaults to 'Unknown'. b2 provides 'Alice' explicitly.Final Answer:b1.author is 'Unknown', b2.auth

[Solved] Given this class:class Book: def __init__(self, title, author='Unknown'): self.title = title self.author = author b1 = Book('Python 101') b2 = Book('Learn AI', 'Alice')What are the values of b1.... | Python

Python - Constructors and Object Initialization

Given this class:

class Book:
    def __init__(self, title, author='Unknown'):
        self.title = title
        self.author = author

b1 = Book('Python 101')
b2 = Book('Learn AI', 'Alice')

What are the values of b1.author and b2.author?

ABoth <code>b1.author</code> and <code>b2.author</code> are 'Unknown'

B<code>b1.author</code> is 'Python 101', <code>b2.author</code> is 'Learn AI'

C<code>b1.author</code> is None, <code>b2.author</code> is 'Alice'

D<code>b1.author</code> is 'Unknown', <code>b2.author</code> is 'Alice'

Step-by-Step Solution

Solution:

Step 1: Understand default parameter usage
The author parameter has a default value 'Unknown', used if no argument is given.
Step 2: Check object creation
b1 is created with only title, so author defaults to 'Unknown'. b2 provides 'Alice' explicitly.
Final Answer:
b1.author is 'Unknown', b2.author is 'Alice' -> Option D
Quick Check:
Default params fill missing arguments [OK]

Quick Trick: Default values apply when argument is missing [OK]

Common Mistakes:

Assuming missing argument becomes None
Mixing title and author values
Forgetting default parameter behavior

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Given this class:

Step 1: Understand default parameter usage

Step 2: Check object creation

Final Answer:

Quick Check:

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