Python Programming Concepts

What is a class in Object-Oriented Programming?

• A class is a type of variable in programming.

• A class is a blueprint for creating objects in Object-Oriented Programming.

• A class is a function that executes code.

• A class is a method for data storage.

Explain the concept of inheritance in Python.

• Inheritance allows a class to create new methods only.

• Inheritance is a method to combine two classes into one.

• Inheritance in Python is a mechanism where a class can inherit attributes and methods from another class, enabling code reuse and a hierarchical class structure.

• Inheritance is a way to delete attributes from a class.

What is the purpose of the __init__ method in a class?

• To create a new class from an existing one.

• To define a class's methods and functions.

• To initialize an object's attributes when a class instance is created.

• To delete an object's attributes when a class instance is destroyed.

How do you create an instance of a class in Python?

• instance = new ClassName()

• create ClassName() instance

• ClassName.instance()

• instance = ClassName()

What is polymorphism in the context of OOP?

• Polymorphism refers to the ability of a class to inherit properties from multiple parent classes.

• Polymorphism is the process of combining multiple classes into one.

• Polymorphism is the technique of creating multiple instances of the same class.

• Polymorphism is the ability of different classes to be treated as instances of the same class through a common interface.

Define encapsulation and its importance in OOP.

• Encapsulation is a method for increasing the speed of code execution.

• Encapsulation is a principle in OOP that restricts access to an object's internal state, enhancing security and maintainability.

• Encapsulation is only relevant in procedural programming.

• Encapsulation allows unlimited access to an object's internal state.

How can you create a private variable in a Python class?

• Use two underscores before the variable name, e.g., __private_var.

• Use the keyword 'private' before the variable name.

• Declare the variable outside the class definition.

• Use a single underscore before the variable name, e.g., _private_var.

What is the difference between a list and a dictionary in Python?

• Lists can only contain numbers, while dictionaries can contain any data type.

• Dictionaries are ordered collections, while lists are unordered.

• The main difference is that lists are indexed collections of items, whereas dictionaries are collections of key-value pairs.

• Lists use keys to access items, whereas dictionaries use indices.

How do you add a new key-value pair to a dictionary?

• Use dictionary_name[new_key] = new_value.

• dictionary_name.append(new_key: new_value)

• dictionary_name.insert(new_key, new_value)

• dictionary_name.add(new_key, new_value)

What method would you use to remove an item from a list?

• Use the 'append()' method.

• Use the 'remove()' or 'pop()' method.

• Use the 'insert()' method.

• Use the 'extend()' method.