A developer is creating a class Counter that counts the number of instances created. They want to use a class variable count that is incremented in __init__. Which code correctly implements this?

class Counter: count = 0; def __init__(self): self.count += 1

class Counter: def __init__(self): self.count = 0; self.count += 1

class Counter: count = 0; def __init__(self): count += 1

class Counter: count = 0; def __init__(self): Counter.count += 1

A developer is designing a class hierarchy for a vehicle system. They have a base class Vehicle with a method start() that prints 'Vehicle started'. They want a subclass Car that overrides start() to print 'Car started' and also calls the parent start(). Which code snippets achieve this? (Select all that apply.)

class Car(Vehicle): def start(self): Vehicle.start(self); print('Car started')

class Car(Vehicle): def start(self): super().start(); print('Car started')

class Car(Vehicle): def start(self): print('Car started')

class Car(Vehicle): def start(self): print('Car started'); super().start()

A developer is implementing a class with a private attribute __balance. They want to provide a method to deposit money that also validates the amount is positive. Which approach best encapsulates the attribute and enforces the validation?

Define self.__balance and a deposit(amount) method that checks if amount > 0 before adding.

Define self.balance and a deposit(amount) method that checks if amount > 0.

Define self.__balance and a deposit(amount) method that adds amount without validation.

Define self._balance and a deposit(amount) method that checks if amount > 0.

A bank wants to model a BankAccount class where each account has a balance and a method to deposit money. Which code snippet correctly defines the class so that each account starts with a balance of 0 and can be deposited into?

class BankAccount: balance = 0; def deposit(self, amount): balance += amount

class BankAccount: def __init__(self): self.balance = 0; def deposit(self, amount): balance = amount

class BankAccount: def __init__(self, balance): self.balance = balance; def deposit(self, amount): self.balance = amount

class BankAccount: def __init__(self): self.balance = 0; def deposit(self, amount): self.balance += amount

Python InstitutePCAP - Certified Associate Python Programmer

Domain 4Objective 1

PCAP-31-03 4.1 Understand the Object-Oriented Approach PCAP-31 Practice Questions (Page 9)

Part of the Object-Oriented Programming domain, which accounts for 34% of the PCAP-31 exam. Python Institute does not publish an official question count, but from its 65-minute exam (~25–45 total, ~9–15 in this domain), expect 2–3 from this objective — we provide 51 practice questions to prepare you well beyond it. (estimate)

51questions here

11free pages

7concepts

34%of the exam

Questions 41–45

41expert · hard
A developer is creating a class Counter that counts the number of instances created. They want to use a class variable count that is incremented in __init__. Which code correctly implements this?
Select an answer first
42expert · hard · select all that apply
A developer is designing a class hierarchy for a vehicle system. They have a base class Vehicle with a method start() that prints 'Vehicle started'. They want a subclass Car that overrides start() to print 'Car started' and also calls the parent start(). Which code snippets achieve this? (Select all that apply.)
Select an answer first
43expert · hard
A developer is implementing a class with a private attribute __balance. They want to provide a method to deposit money that also validates the amount is positive. Which approach best encapsulates the attribute and enforces the validation?
Select an answer first
44application · medium
A bank wants to model a BankAccount class where each account has a balance and a method to deposit money. Which code snippet correctly defines the class so that each account starts with a balance of 0 and can be deposited into?
Select an answer first
45application · medium
A developer wants to protect a User object's password attribute from direct modification. They decide to use name mangling. Which attribute name should they use inside the class?
Select an answer first

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PCAP-31-03 4.1 Understand the Object-Oriented Approach PCAP-31 Practice Questions (Page 9)

Questions 41–45

A developer is creating a class Counter that counts the number of instances created. They want to use a class variable count that is incremented in __init__. Which code correctly implements this?

A developer is implementing a class with a private attribute __balance. They want to provide a method to deposit money that also validates the amount is positive. Which approach best encapsulates the attribute and enforces the validation?

A bank wants to model a BankAccount class where each account has a balance and a method to deposit money. Which code snippet correctly defines the class so that each account starts with a balance of 0 and can be deposited into?

A developer wants to protect a User object's password attribute from direct modification. They decide to use name mangling. Which attribute name should they use inside the class?

Keep studying — Object-Oriented Programming

A developer is creating a class Counter that counts the number of instances created. They want to use a class variable count that is incremented in init. Which code correctly implements this?