Object-Oriented Programming & Data Structures Quiz

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Questions and Answers

What is the key characteristic of an object in object-oriented programming?

It can only store integers

It is based on a class and can receive messages (correct)

It is a procedure for data processing

It is solely a storage container for variables

In Python, every entity such as a list or function can be treated as an object.

True

What method in the BankAccount class decreases the balance of the account?

withdraw

Each bank account should not allow the balance to go below £______.

100 Signup and view all the answers

Match the following OOP terms with their definitions:

Class = A structure for defining a type of object Instance = An object that is of a particular class Attribute = Variables or properties of a class or an instance Method = A function that is associated with a class Signup and view all the answers

What happens when a simple data type, such as an integer, is assigned to a new variable?

A copy of the integer is created for the new variable. Signup and view all the answers

When a mutable object is assigned to a new variable, both variables refer to different objects in memory.

False Signup and view all the answers

What is the term for two variable names referencing the same object in memory?

aliasing Signup and view all the answers

The slice operation allows us to create a __________ of a mutable object.

shallow copy Signup and view all the answers

Match the following terms with their definitions:

Assignment = Copying a value to a new variable Mutable object = An object that can be changed after creation Shallow copy = A copy that references the original items Aliasing = Two variable names pointing to the same object Signup and view all the answers

What happens when you modify a mutable object that has been assigned to another variable?

Both variables are modified. Signup and view all the answers

Slicing creates two completely independent objects of a list.

True Signup and view all the answers

Explain the effect of modifying an item in a list created via slicing.

Changes made to the new list do not affect the original list. Signup and view all the answers

What is the primary purpose of encapsulation in OOP?

To improve data flow control Signup and view all the answers

Inheritance allows for circular references between classes.

False Signup and view all the answers

What is polymorphism in the context of OOP?

The ability to define an abstract method that must be implemented by subclasses. Signup and view all the answers

Information hiding is achieved using __________ variables and setter/getter methods.

public, private, and protected Signup and view all the answers

Match the following terms with their definitions:

Encapsulation = Restriction of access to variables and methods Inheritance = Transfer of characteristics from superclass to subclass Polymorphism = Abstract method implementation by subclasses Nested lists = Lists containing other lists Signup and view all the answers

Which method would you use to add multiple elements to a list in Python?

extend() Signup and view all the answers

A nested list can contain other data structures like dictionaries or tuples.

True Signup and view all the answers

How do you print a specific item from a nested list?

By accessing it through its index, e.g., list_name[i][j] for the item at row i, column j. Signup and view all the answers

What is the key difference between a shallow copy and an assignment?

Shallow copy creates a new object, assignment points to the existing object Signup and view all the answers

The csv module in Python can only read data, not write it.

False Signup and view all the answers

What function is used to create a reader object for a csv file?

csv.reader Signup and view all the answers

To read data from a csv file, you first need to open the file using the function ______.

open Signup and view all the answers

What does each row read from the csv.reader object return?

A list of strings Signup and view all the answers

Match the following csv module functions with their purpose:

csv.reader = Reads data from a csv file csv.writer = Writes data to a csv file csv.load = Loads data from a database csv.save = Saves data into a file Signup and view all the answers

What happens to the header when reading data from a csv file?

It is returned as a list of strings Signup and view all the answers

When modifying revenues in projects read from a csv file, by how much is each project's revenue increased?

£100 Signup and view all the answers

What mode is used to open a CSV file for writing?

w Signup and view all the answers

Default arguments in a function cannot be mutable objects.

True Signup and view all the answers

When reading a CSV file, what is the first action taken with the revenue data?

Increase the revenue of each project by £100. Signup and view all the answers

The function `range(4, 11, 2)` results in the sequence ________.

4, 6, 8, 10 Signup and view all the answers

Match the following function calls to their descriptions:

range(m, n, s) = Generates a sequence from m to n with a step s range(m, n) = Generates a sequence from m to n with a step of 1 range(n) = Generates a sequence from 0 to n with a step of 1 open(name_of_csvfile, 'w') = Opens a file for writing Signup and view all the answers

What does the `csv.writer(file_object)` function return?

Writer object Signup and view all the answers

A variable number of arguments allows a function to accept multiple values for a single parameter.

False Signup and view all the answers

What is the purpose of the `writerow(row)` function?

To write a row of data to the writer's file object. Signup and view all the answers

Study Notes

Object-Oriented Programming (OOP)

OOP is a programming paradigm where programs are built around classes and objects
Objects are abstractions of data, which can receive messages, process data and send messages
Classes define the structure of objects
Methods are functions associated with a class
Instances are objects of a specific class
Attributes are variables or properties of a class or instance

Nested Lists

Nested lists are lists containing other lists
To iterate over nested lists, use nested loops
To access specific items in a nested list, use indexing
append() adds an item to the end of a list
extend() appends elements from an iterable to the end of a list

Deep vs Shallow Copy

Shallow copy constructs a new object, but only copies references to existing mutable objects
Deep copy creates a new object and copies all nested objects recursively
Shallow copy can lead to unintended changes in original objects

CSV File Manipulation

The csv module helps read and write data from/to CSV files
csv.reader() reads CSV files, returning each row as a list of strings
csv.writer() writes data to a CSV file, taking a list as a row

Variable Number of Arguments in Functions

Default arguments allow optional arguments with default values
Functions can accept a variable number of arguments using *args and **kwargs
*args collects positional arguments into a tuple
**kwargs collects keyword arguments into a dictionary

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Description

Test your knowledge on Object-Oriented Programming concepts, nested lists, and methods for manipulating data structures. This quiz covers key principles such as classes, objects, shallow and deep copying, as well as CSV file manipulation. Challenge yourself and see how well you understand these foundational programming topics.

Object-Oriented Programming & Data Structures Quiz

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Podcast

Questions and Answers

What is the key characteristic of an object in object-oriented programming?

In Python, every entity such as a list or function can be treated as an object.

What method in the BankAccount class decreases the balance of the account?

Each bank account should not allow the balance to go below £______.

Match the following OOP terms with their definitions:

What happens when a simple data type, such as an integer, is assigned to a new variable?

When a mutable object is assigned to a new variable, both variables refer to different objects in memory.

What is the term for two variable names referencing the same object in memory?

The slice operation allows us to create a __________ of a mutable object.

Match the following terms with their definitions:

What happens when you modify a mutable object that has been assigned to another variable?

Slicing creates two completely independent objects of a list.

Explain the effect of modifying an item in a list created via slicing.

What is the primary purpose of encapsulation in OOP?

Inheritance allows for circular references between classes.

What is polymorphism in the context of OOP?

Information hiding is achieved using __________ variables and setter/getter methods.

Match the following terms with their definitions:

Which method would you use to add multiple elements to a list in Python?

A nested list can contain other data structures like dictionaries or tuples.

How do you print a specific item from a nested list?

What is the key difference between a shallow copy and an assignment?

The csv module in Python can only read data, not write it.

What function is used to create a reader object for a csv file?

To read data from a csv file, you first need to open the file using the function ______.

What does each row read from the csv.reader object return?

Match the following csv module functions with their purpose:

What happens to the header when reading data from a csv file?

When modifying revenues in projects read from a csv file, by how much is each project's revenue increased?

What mode is used to open a CSV file for writing?

Default arguments in a function cannot be mutable objects.

When reading a CSV file, what is the first action taken with the revenue data?

The function range(4, 11, 2) results in the sequence ________.

Match the following function calls to their descriptions:

What does the csv.writer(file_object) function return?

A variable number of arguments allows a function to accept multiple values for a single parameter.

What is the purpose of the writerow(row) function?

Study Notes

Object-Oriented Programming (OOP)

Nested Lists

Deep vs Shallow Copy

CSV File Manipulation

Variable Number of Arguments in Functions

Studying That Suits You

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