Demonstration of class in python

class_demo.py

# all classes are sub-classes/children of the ultimate parent class -> object (i think)
class Rectangle(object):
  
  # the constructor
  def __init__(self, length, breadth):
    # class's properties
    self.length = length
    self.breadth = breadth
    
  def area(self):
    return self.length * self.breadth
  
  def perimeter(self):
    return 2 * (self.length + self.breadth)
  
# end of class

'''
How to instantiate/create an object of type Rectangle?
'''

r1 = Rectangle(2,3) # __init__ is called here
r2 = Rectangle(4,6) # another object
r3 = Rectangle(1,3) # another object


# how do you call a method of a class?
area1 = r1.area()
peri3 = r3.perimeter()
print(area1)
print(peri3)

# access properties of a class
r2_l = r2.length
r2_b = r2.breadth
print(r2_l, r2_b)