Inheritance-Polymorphism

### inheritance example 
class A:
    def __init__(self, i = 0):
        self.i = i


class B(A):
    def __init__(self, j = 0):
        self.j = j

def main():
    b = B()
    #print(b.i) Throws an error because class B does not instantiate A, this can be done manually via super()__init__()
    print(b.j)

main()


## Correct example here:

class A1:
    def __init__(self, i = 1):
        self.i = i

class B1(A1):
    def __init__(self, j = 2):
        super().__init__()
        self.j = j

def main1():
    b = B1()
    print(b.i, b.j)

main1()

###

class ParentClass:
     def __init__(self):
         self.__x = 1
         self.y = 10
 
     def print(self):
         print(self.__x, self.y)

class ChildClass(ParentClass):
     def __init__(self):
         super().__init__()
         self.__x = 2
         self.y = 20
         
c = ChildClass()
c.print()

object

#####

class A2:
    def __init__(self):
        self.i = 1

    def m(self):
        self.i = 10

class B2(A2):
    def m(self):
        self.i += 1
        return self.i

def main2():
    b = B2()
    print(b.m())

main2()


######

class A3:
    def __str__(self):
        return "A"

class B3(A3):
    def __init__(self):
        super().__init__()

class C3(B3):
    def __init__(self):
        super().__init__()

def main3():
    a = A3()
    b = B3()
    c = C3()
    print(a, b, c)

main3()

# left over from previous example
# dont mind this! :)

import math

class Triangle():
    def __init__(self, side1 = 1.0, side2 = 1.0, side3 = 1.0):
        self.side1 = side1
        self.side2 = side2
        self.side3 = side3

    def getSide1(self): return self.side1
    def getSide2(self): return self.side2
    def getSide3(self): return self.side3
    
    def getArea(self):
        return math.sqrt() # i dont know the formula, it wasent given in the description
    
    def getPerimiter(self):
        return self.side1 + self.side2 + self.side3
    
    def __str__(self):
        return f"side1 ={self.side1} side2 ={self.side2} side3 ={self.side3}"