What do init and self do in python

0 votes
What are the roles and significance of the "init" method and the "self" parameter in Python, and how do they contribute to the object-oriented programming paradigm within the language?
Sep 25, 2023 in Python by Saniya
• 3,320 points
554 views

1 answer to this question.

0 votes

In Python, `init` and `self` are related to object-oriented programming and are commonly used when defining classes. They are not standalone functions or keywords; rather, they have specific roles within class definitions:

1. `__init__` (Double Underscore Init):
   - `__init__` is a special method (also called a constructor) in Python classes.
   - It is automatically called when an object of the class is created (instantiated).
   - The primary purpose of `__init__` is to initialize the attributes (variables) of the object.
   - You can think of it as the class's "initializer" or "constructor."
   - `__init__` takes at least one parameter, conventionally named `self`, which refers to the instance of the class being created. You can also define additional parameters to initialize the object's attributes.

Example:
```python
class MyClass:
    def __init__(self, value):
        self.value = value

# Creating an object of MyClass
obj = MyClass(42)
```

2. `self`:
   - `self` is a conventionally used name for the first parameter of instance methods in Python classes. You can actually name it something else, but using `self` is a widely accepted convention.
   - It represents the instance of the class itself and allows you to access and manipulate its attributes and methods.
   - By convention, `self` is passed as the first parameter to all instance methods, including `__init__`, but you don't need to explicitly pass it when calling the method; Python does that for you.

Example:
```python
class MyClass:
    def __init__(self, value):
        self.value = value
    
    def print_value(self):
        print(self.value)

obj = MyClass(42)
obj.print_value()  # This implicitly passes 'obj' as 'self' to print_value()
```

In the example above, `self` is used within the `__init__` method to assign the `value` parameter to an attribute of the object, and it's also used within the `print_value` method to access the object's `value` attribute.

Understanding `__init__` and `self` is fundamental to working with classes and objects in Python, as they allow you to create objects with initialized attributes and define methods that can operate on those attributes.

answered Oct 5, 2023 by anonymous
• 3,320 points

Related Questions In Python

0 votes
0 answers

What do __init__ and self do in Python? [duplicate]

During my Python lectures, I've come across a ...READ MORE

Aug 31, 2023 in Python by Edureka
• 220 points
137 views
+1 vote
7 answers
+3 votes
2 answers

What does Python _init_ and self do?

Hey @Anirudh!  Self The self keyword is used to access ...READ MORE

answered Oct 31, 2018 in Python by Omkar
• 69,230 points
6,243 views
0 votes
1 answer

What is the key difference between self in ruby and self in python?

Ruby and Python are actually very different languages (although ...READ MORE

answered Jul 30, 2019 in Python by Mohammad
• 3,230 points
805 views
+5 votes
7 answers

Docker swarm vs kubernetes

Swarm is easy handling while kn8 is ...READ MORE

answered Aug 27, 2018 in Docker by Mahesh Ajmeria
3,477 views
0 votes
2 answers
0 votes
1 answer

Why am I getting the syntax error SyntaxError invalid syntax in a line that contains fully valid syntax?

A "SyntaxError: invalid syntax" is a common ...READ MORE

answered Oct 18, 2023 in Python by anonymous
• 3,320 points
776 views
0 votes
1 answer

Command python execinterminal icon not found

When the "command Python execInTerminal" icon or ...READ MORE

answered Nov 29, 2023 in Python by anonymous
• 3,320 points
1,008 views
webinar REGISTER FOR FREE WEBINAR X
REGISTER NOW
webinar_success Thank you for registering Join Edureka Meetup community for 100+ Free Webinars each month JOIN MEETUP GROUP