__init__ python

                                    # If you are familiar with C++ or Java think of the __init__ method as a constructor.
# It is the method that is being called when the class is called.In the following
# example we will see how we can call the __init__ method

my_variable = MyClass()

                                    class Person:
  def __init__(self, name, age):
    self.name = name
    self.age = age

p1 = Person("John", 36) // Object definition

print(p1.name)
print(p1.age)

                                    The __init__ function serves two main purposes. 
The first is its used as a tool to pass 
arguments inside of it but the difference is you can spread those
arguments to other functions located in the same class. 
To do this you would place the word (self.) keyword in another function 
followed by the arguments name. This allows the argument to be spread 
down to that function. 
The second purpose is it allows you to pass arguments to a 
class when calling the class. Without this function inside the class
when you call the class no arguments would be able to go inside getting
nothing in return.

                                    class A(object):
    def __init__(self):
        self.x = 'Hello'

    def method_a(self, foo):
        print self.x + ' ' + foo

                                    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()))