Python Tutorials · Python Class Methods

Python Class Methods

Learn all about Python Class Methods in this comprehensive tutorial.

5 min read advanced

Python Class Properties

Python Inheritance

•Methods are functions that belong to a class.
•Methods can accept parameters just like regular functions:
•Methods can access and modify object properties using self:
•Methods can modify the properties of an object:
•The __str__() method is a special method that controls what is returned when the object is printed:
•A class can have multiple methods that work together:
•You can delete methods from a class using the del keyword:

Class Methods

Methods are functions that belong to a class. They define the behavior of objects created from the class.

python

class Person:  def __init__(self, name):    self.name = name  def greet(self):    print("Hello, my name is " + self.name)p1 = Person("Emil")p1.greet()

Note: Note: All methods must have self as the first parameter.

Methods with Parameters

Methods can accept parameters just like regular functions:

python

class Calculator:  def add(self, a, b):    return a + b  def multiply(self, a, b):    return a * bcalc = Calculator()print(calc.add(5, 3))print(calc.multiply(4, 7))

Methods Accessing Properties

Methods can access and modify object properties using self:

python

class Person:  def __init__(self, name, age):    self.name = name    self.age = age  def get_info(self):    return f"{self.name} is {self.age} years old"p1 = Person("Tobias", 28)print(p1.get_info())

Methods Modifying Properties

Methods can modify the properties of an object:

python

class Person:  def __init__(self, name, age):    self.name = name    self.age = age  def celebrate_birthday(self):    self.age += 1    print(f"Happy birthday! You are now {self.age}")p1 = Person("Linus", 25)p1.celebrate_birthday()p1.celebrate_birthday()

The str() Method

The __str__() method is a special method that controls what is returned when the object is printed:

python

class Person:  def __init__(self, name, age):    self.name = name    self.age = agep1 = Person("Emil", 36)print(p1)

python

class Person:  def __init__(self, name, age):    self.name = name    self.age = age  def __str__(self):    return f"{self.name} ({self.age})"p1 = Person("Tobias", 36)print(p1)

Multiple Methods

A class can have multiple methods that work together:

python

class Playlist:  def __init__(self, name):    self.name = name    self.songs = []  def add_song(self, song):    self.songs.append(song)    print(f"Added: {song}")  def remove_song(self, song):    if song in self.songs:      self.songs.remove(song)      print(f"Removed: {song}")  def show_songs(self):    print(f"Playlist '{self.name}':")    for song in self.songs:      print(f"- {song}")my_playlist = Playlist("Favorites")my_playlist.add_song("Bohemian Rhapsody")my_playlist.add_song("Stairway to Heaven")my_playlist.show_songs()

Delete Methods

You can delete methods from a class using the del keyword:

python

class Person:  def __init__(self, name):    self.name = name  def greet(self):    print("Hello!")p1 = Person("Emil")del Person.greetp1.greet()  # This will cause an error

Module quiz

2 questions

Which of the following is true about Python Class Methods?

It is strictly typedIt is evaluated at runtimeIt requires explicit memory managementIt is deprecated

What is the most common pitfall when working with Python Class Methods?

SyntaxErrorIndentationErrorNameErrorTypeError

Answer all questions to submit.

Python Class Properties

Python Inheritance

Python Class Methods

AI Summary

Class Methods

Methods with Parameters

Methods Accessing Properties

Methods Modifying Properties

The __str__() Method

Multiple Methods

Delete Methods

Module quiz

The str() Method