Solution:Step 1: Understand default parameter in __init__The author parameter has a default value "Unknown", so it is optional when creating an object.Step 2: Analyze object creationsb1 is created with only title, so author is "Unknown". b2 provides both title and author "Dr. Smith".Step 3: Check pr

[Solved] Consider this class:class Book: def __init__(self, title, author="Unknown"): self.title = title self.... Smith") print(b1.author, b2.author)What will be printed? | Python

Python - Constructors and Object Initialization

Consider this class:

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

b1 = Book("Python 101")
b2 = Book("Learn AI", "Dr. Smith")
print(b1.author, b2.author)

What will be printed?

ADr. Smith Unknown

BPython 101 Learn AI

CUnknown Dr. Smith

DError due to missing author argument

Step-by-Step Solution

Solution:

Step 1: Understand default parameter in __init__
The author parameter has a default value "Unknown", so it is optional when creating an object.
Step 2: Analyze object creations
b1 is created with only title, so author is "Unknown". b2 provides both title and author "Dr. Smith".
Step 3: Check print output
Printing b1.author and b2.author prints "Unknown Dr. Smith".
Final Answer:
Unknown Dr. Smith -> Option C
Quick Check:
Default parameters fill missing values = A [OK]

Quick Trick: Default values fill missing arguments in __init__ [OK]

Common Mistakes:

MISTAKES

Expecting error when argument is missing
Mixing up title and author values
Assuming both arguments are always required

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More Python Quizzes

Consider this class:

Step 1: Understand default parameter in `init`

Step 2: Analyze object creations

Step 3: Check print output

Final Answer:

Quick Check:

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