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What is difference between self and __init__ methods in python Class?
self
The word 'self' is used to represent the instance of a class. By using the "self" keyword we access the attributes and methods of the class in python.
__init__ method
"__init__" is a reseved method in python classes. It is called as a constructor in object oriented terminology. This method is called when an object is created from a class and it allows the class to initialize the attributes of the class.
Example
Find out the cost of a rectangular field with breadth(b=120), length(l=160). It costs x (2000) rupees per 1 square unit
class Rectangle:
def __init__(self, length, breadth, unit_cost=0):
self.length = length
self.breadth = breadth
self.unit_cost = unit_cost
def get_area(self):
return self.length * self.breadth
def calculate_cost(self):
area = self.get_area()
return area * self.unit_cost
# breadth = 120 units, length = 160 units, 1 sq unit cost = Rs 2000
r = Rectangle(160, 120, 2000)
print("Area of Rectangle: %s sq units" % (r.get_area()))Output
This gives the output
Area of Rectangle: 19200 sq units Cost of rectangular field: Rs.38400000
Updated on: 13-Jun-2020
7K+ Views
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