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If you are working with Python, there is no escaping from the word “self”. It is used in method definitions and in variable initialization. The self method is explicitly used every time we define a method. In this article, we will get into the depth of self in Python in the following sequence:
The self is used to represent the instance of the class. With this keyword, you can access the attributes and methods of the class in python. It binds the attributes with the given arguments. The reason why we use self is that Python does not use the ‘@’ syntax to refer to instance attributes. In Python, we have methods that make the instance to be passed automatically, but not received automatically.
class food(): # init method or constructor def __init__(self, fruit, color): self.fruit = fruit self.color = color def show(self): print("fruit is", self.fruit) print("color is", self.color ) apple = food("apple", "red") grapes = food("grapes", "green") apple.show() grapes.show()
Fruit is apple color is red Fruit is grapes color is green
self is also used to refer to a variable field within the class. Let’s take an example and see how it works:
class Person: # name made in constructor def __init__(self, John): self.name = John def get_person_name(self): return self.name
In the above example, self refers to the name variable of the entire Person class. Here, if we have a variable within a method, self will not work. That variable is simply existent only while that method is running and hence, is local to that method. For defining global fields or the variables of the complete class, we need to define them outside the class methods.
self is used in different places and often thought to be a keyword. But unlike in C++, self is not a keyword in Python.
self is a parameter in function and the user can use a different parameter name in place of it. Although it is advisable to use self because it increases the readability of code.
class this_is_class: def show(in_place_of_self): print("It is not a keyword " "and you can use a different keyword") object = this_is_class() object.show()
It is not a keyword and you can use a different keyword
With this, we have come to the end of our article. I hope you understood the use of self and how it works in Python.
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