self in Python class
self represents the instance of the class. By using the “self” keyword we can access the attributes and methods of the class in python. It binds the attributes with the given arguments.
The reason you need to use self. is because Python does not use the @ syntax to refer to instance attributes. Python decided to do methods in a way that makes the instance to which the method belongs be passed automatically, but not received automatically: the first parameter of methods is the instance the method is called on
# Write Python3 code here class car(): # init method or constructor def __init__(self, model, color): self.model = model self.color = color def show(self): print("Model is", self.model ) print("color is", self.color ) # both objects have different self which # contain their attributes audi = car("audi a4", "blue") ferrari = car("ferrari 488", "green") audi.show() # same output as car.show(audi) ferrari.show() # same output as car.show(ferrari) # Behind the scene, in every instance method # call, python sends the instances also with # that method call like car.show(audi) |
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Output:
Model is audi a4 color is blue Model is ferrari 488 color is green
Self is a convention and not a real python keyword
self is parameter in function and user can user another parameter name in place of it.But it is advisable to use self because it increase the readability of code.
# Write Python3 code here class this_is_class: def show(in_place_of_self): print("we have used another " "parameter name in place of self") object = this_is_class() object.show() |
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Output:
we have used another parameter name in place of self
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