#Python self Parameter

The self parameter is a reference to the current instance of the class. It is used to access variables and methods that belong to that specific object.

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#Why Use self?

Without self, Python would not know which object's properties you are trying to access. It acts as the link between the method and the specific instance of the class.

Example: Linking methods to specific objects

pythoncopyclass Person:
  def __init__(self, name):
    self.name = name

  def printname(self):
    print(self.name)

p1 = Person("Tobias")
p2 = Person("Linus")

p1.printname()
p2.printname()

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#Key Rules for self

• Position: It must be the first parameter of any method in the class.
• Naming: It does not strictly have to be named self. You can call it whatever you like (e.g., myobject or abc), but it must remain the first parameter.
• Convention: While other names work, it is strongly recommended to use self to follow Python’s standard naming conventions and ensure code readability.

Example: Using custom names instead of self

pythoncopyclass Person:
  def __init__(myobject, name, age):
    myobject.name = name
    myobject.age = age

  def greet(abc):
    print("Hello, my name is " + abc.name)

p1 = Person("Emil", 36)
p1.greet()

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#Accessing Properties with self

You can access any property of the class by prefixing the variable name with self.

Example: Accessing multiple properties

pythoncopyclass Car:
  def __init__(self, brand, model, year):
    self.brand = brand
    self.model = model
    self.year = year

  def display_info(self):
    print(f"{self.year} {self.brand} {self.model}")

car1 = Car("Toyota", "Corolla", 2020)
car1.display_info()

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#Calling Methods with self

self is also used to call other methods within the same class.

Example: Calling one method from another

pythoncopyclass Person:
  def __init__(self, name):
    self.name = name

  def greet(self):
    return "Hello, " + self.name

  def welcome(self):
    message = self.greet()
    print(message + "! Welcome to our website.")

p1 = Person("Tobias")
p1.welcome()