Python programming

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Questions and Answers

What is the primary purpose of abstraction in Object-Oriented Programming (OOP)?

  • To inherit features from another class.
  • To define multiple forms of a method.
  • To increase the visibility of internal details of a class.
  • To hide implementation details and show only essential features. (correct)

Which statement accurately describes the difference between an abstract class and an interface in OOP?

  • An abstract class can have implemented methods, but an interface cannot. (correct)
  • An interface can be instantiated but an abstract class cannot.
  • There is no difference; both are identical.
  • An interface can have private methods, while an abstract class cannot.

Which statement about tuples is correct?

  • Tuples are mutable and can be changed.
  • Tuples can only store elements of the same data type. (correct)
  • Tuples cannot be nested within other tuples.
  • Tuples can store an unlimited number of elements of mixed data types.

Which data type in Python is best suited for storing unique, unordered items?

<p>Set (A)</p> Signup and view all the answers

Which statement is true regarding Python dictionaries?

<p>Values can have duplicates. (D)</p> Signup and view all the answers

Which of the following statements is accurate about Python functions?

<p>A function can have multiple return statements. (C)</p> Signup and view all the answers

What is the correct method to add an item to a list in Python?

<p>list.append(item) (C)</p> Signup and view all the answers

Why is it advised not to name your Python variable 'str'?

<p>It prevents the use of Python's built-in string functions. (D)</p> Signup and view all the answers

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Flashcards

What is the purpose of Abstraction in OOP?

Abstraction in Object-Oriented Programming (OOP) aims to simplify complex systems by hiding unnecessary details and presenting only the essential information. It focuses on what an object does rather than how it does it.

What is the difference between an abstract class and an interface in OOP?

An abstract class can have implemented methods, providing a blueprint for subclasses. An interface only defines methods without implementation, forcing subclasses to define them.

Tuples can only store elements of the same data type.

False. Tuples are ordered collections that can store elements of different data types.

Which Python data type is best suited for storing unique, unordered items?

The Python data type 'set' is best suited for storing unique, unordered items. Sets do not allow duplicates and are optimized for membership testing.

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Which of the following is true about Python dictionaries?

Python dictionaries are mutable key-value pairs where keys must be unique and hashable (immutable), and values can have duplicates. Keys can be of different data types, but values can be of various types as well.

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Which of the following statements is true about Python functions?

A Python function can have multiple return statements, allowing it to return different values based on conditions. It's not mandatory for a function to have a return statement. If there is no return statement, the function returns None by default.

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Why shouldn't you name your Python variable str?

You should avoid naming your Python variable as 'str' because it conflicts with the built-in 'str' class. Doing so will shadow the 'str' class, making it inaccessible.

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How do you add an item to a list in Python?

The correct way to add an item to a list in Python is by using the 'append()' method. It adds the item to the end of the list.

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Study Notes

Abstraction in OOP

  • Abstraction in object-oriented programming (OOP) focuses on hiding complex implementation details and showcasing only essential features.
  • This simplifies interaction with the class and its methods.

Abstract Class vs. Interface

  • Abstract classes can have both implemented and unimplemented methods.
  • Interfaces can't have implemented methods.
  • Interfaces can be instantiated, but abstract classes cannot.

Python Data Types

  • Tuples can store elements of different data types.
  • Sets are used for unique, unordered items.
  • The correct way to add an item to a Python list is list.append(item).

Python Dictionaries

  • Dictionary keys can hold duplicate values.
  • Dictionary values can have duplicates.

Python Functions

  • Functions can have multiple return statements.
  • Functions can have default arguments.

Python Variable Naming

  • Avoid naming variables after built-in types (e.g., str) to prevent shadowing errors.

Error Handling

  • ZeroDivisionError occurs when dividing by zero during a program execution.

Object-Oriented Programming Principles

  • Encapsulation, Inheritance, and Polymorphism.

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