Python Tutorials · Python Class Properties

Python Class Properties

Learn all about Python Class Properties in this comprehensive tutorial.

5 min read advanced

Python self Parameter

Python Class Methods

•Properties are variables that belong to a class.
•You can access object properties using dot notation:
•You can modify the value of properties on objects:
•You can delete properties from objects using the del keyword:
•Properties defined inside __init__() belong to each object (instance properties).
•When you modify a class property, it affects all objects:
•You can add new properties to existing objects:

Class Properties

Properties are variables that belong to a class. They store data for each object created from the class.

python

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

Access Properties

You can access object properties using dot notation:

python

class Car:  def __init__(self, brand, model):    self.brand = brand    self.model = modelcar1 = Car("Toyota", "Corolla")print(car1.brand)print(car1.model)

Modify Properties

You can modify the value of properties on objects:

python

class Person:  def __init__(self, name, age):    self.name = name    self.age = agep1 = Person("Tobias", 25)print(p1.age)p1.age = 26print(p1.age)

Delete Properties

You can delete properties from objects using the del keyword:

python

class Person:  def __init__(self, name, age):    self.name = name    self.age = agep1 = Person("Linus", 30)del p1.ageprint(p1.name)  # This works# print(p1.age)  # This would cause an error

Class Properties vs Object Properties

Properties defined inside __init__() belong to each object (instance properties).

Properties defined outside methods belong to the class itself (class properties) and are shared by all objects:

python

class Person:  species = "Human"  # Class property  def __init__(self, name):    self.name = name  # Instance propertyp1 = Person("Emil")p2 = Person("Tobias")print(p1.name)print(p2.name)print(p1.species)print(p2.species)

Modifying Class Properties

When you modify a class property, it affects all objects:

python

class Person:  lastname = ""  def __init__(self, name):    self.name = namep1 = Person("Linus")p2 = Person("Emil")Person.lastname = "Refsnes"print(p1.lastname)print(p2.lastname)

Add New Properties

You can add new properties to existing objects:

python

class Person:  def __init__(self, name):    self.name = namep1 = Person("Tobias")p1.age = 25p1.city = "Oslo"print(p1.name)print(p1.age)print(p1.city)

Note: Note: Adding properties this way only adds them to that specific object, not to all objects of the class.

Module quiz

2 questions

Which of the following is true about Python Class Properties?

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 Properties?

SyntaxErrorIndentationErrorNameErrorTypeError

Answer all questions to submit.

Python self Parameter

Python Class Methods

Python Class Properties

AI Summary

Class Properties

Access Properties

Modify Properties

Delete Properties

Class Properties vs Object Properties

Modifying Class Properties

Add New Properties

Module quiz