PCAP-31-03 4.6 Construct and Initialize Objects PCAP-31 Practice Questions (Page 5)

Questions 21–25

1. 21application · easy

   A developer is writing code to create a new user account object. The User class has an __init__ method that requires a username and email. Which line of code correctly creates a User object with username 'alice' and email 'alice@example.com'?

   • Auser = User()
   • Buser = User.__init__('alice', 'alice@example.com')
   • Cuser = User(username='alice', email='alice@example.com')
   • Duser = User('alice', 'alice@example.com')
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2. 22application · medium

   A developer is implementing a class to represent a bank account. The __init__ method should set an instance attribute balance to an initial value passed as an argument. Which code snippet correctly binds the attribute to the instance?

   • Aclass Account: def __init__(self, initial): Account.balance = initial
   • Bclass Account: def __init__(self, initial): self.balance = initial
   • Cclass Account: def __init__(initial): self.balance = initial
   • Dclass Account: def __init__(self, initial): balance = initial
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4. 23application · easy

   A developer defines a simple class called Product with no __init__ method. They then create an instance with product = Product(). What happens?

   • AAn error occurs because a class must have an __init__ method.
   • BThe instance is created, but it cannot be used until __init__ is called manually.
   • CThe instance is created, but it automatically gets a product_id attribute.
   • DThe instance is created successfully, and it has no instance attributes.
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5. 24application · medium

   A developer needs to create a class named Employee where each employee object must have a name and an employee ID, both provided at the time of creation. Which constructor declaration is correct?

   • Adef __init__(name, emp_id): self.name = name; self.emp_id = emp_id
   • Bdef __init__(self, name, emp_id): self.name = name; self.emp_id = emp_id
   • Cdef __init__(self): self.name = 'Unknown'; self.emp_id = 0
   • Ddef __init__(self, emp_id, name): self.name = name; self.emp_id = emp_id
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6. 25application · easy

   A developer is creating a class for a point in 2D space. The constructor should accept x and y coordinates as arguments. Which code snippet correctly initializes a Point object with x=3 and y=4?

   • Ap = Point()
   • Bp = Point(x=3, y=4)
   • Cp = Point(3)
   • Dp = Point(3, 4)
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