# Parent class class Person: # Constructor: a special type of subroutine called to create an object def __init__(self, name, age, citizenship): # class attributes self.name = name self.age = age self.citizenship = {citizenship} # Methods of the class def update_age(self, new_age): self.age = new_age def add_citizenship(self, new_citizenship): self.citizenship.add(new_citizenship) def remove_citizenship(self, citizenship_to_remove): if citizenship_to_remove in self.citizenship: self.citizenship.remove(citizenship_to_remove) def change_name(self, new_name): self.name = new_name def get_info(self): print("Name of the person: {}".format(self.name)) print("Age of the person: {}".format(self.age)) print("Citizenships of the person: {}".format(self.citizenship)) ################################################################################################### # Children classes class Student(Person): def __init__(self, name, age, citizenship, major, school): # super() is a special object created from the parent class super().__init__(name, age, citizenship) self.major = major self.school = school def change_major(self, new_major): self.major = new_major def change_school(self, new_school): self.school = new_school def get_info(self): super().get_info() print("Major: ", self.major) print("School: ", self.school) class Worker(Person): def __init__(self, name, age, citizenship, position, company): # super() is a special object created from the parent class super().__init__(name, age, citizenship) self.position = position self.company = company def change_position(self, new_position): self.position = new_position def change_company(self, new_company): self.company = new_company def get_info(self): super().get_info() print("Position: ", self.position) print("Company: ", self.company)

# object kevin of the class Student print("State 0") kevin = Student("Kevin", 27, "indonesian", "Physics", "National University of Singapore") kevin.get_info() print("-----------------------------------------------------------------") # modify some info print("State 1") kevin.update_age(27) kevin.add_citizenship("chinese") kevin.get_info() print("-----------------------------------------------------------------") # modify some info: print("State 2") kevin.change_major("Computer Science") kevin.school = "Heidelberg University" # it changes the attribute value directly kevin.get_info() print("-----------------------------------------------------------------") # modify some info print("State 3") kevin.add_citizenship("german") kevin.get_info() print("-----------------------------------------------------------------") # modify some info print("State 4") kevin.remove_citizenship("german") kevin.get_info()

# object antonio of the class Worker print("State 0") antonio = Worker("Antonio", 25, "mexican", "Software Developer", "Oracle") antonio.get_info() print("-----------------------------------------------------------------") # modify some info print("State 1") antonio.update_age(27) antonio.add_citizenship("german") antonio.get_info() print("-----------------------------------------------------------------") # modify some info: print("State 2") antonio.company = "Microsoft" # it changes the attribute value directly antonio.change_position("Machine Learning Engineer") antonio.get_info() print("-----------------------------------------------------------------") # modify some info print("State 3") antonio.add_citizenship("french") antonio.get_info() print("-----------------------------------------------------------------") # modify some info print("State 4") antonio.remove_citizenship("french") antonio.get_info()

class Person: # Constructor: a special type of subroutine called to create an object def __init__(self, name, age, citizenship): # class attributes self._name = name self.__age = age self.citizenship = {citizenship} # Methods of the class def update_age(self, new_age): if isinstance(new_age, int): self.__age = new_age else: raise TypeError("The paramter new_age must be an integer!") def add_citizenship(self, new_citizenship): self.citizenship.add(new_citizenship) def remove_citizenship(self, citizenship_to_remove): if citizenship_to_remove in self.citizenship: self.citizenship.remove(citizenship_to_remove) def change_name(self, new_name): if isinstance(new_name, str): self._name = new_name else: raise TypeError("The paramter new_name must be a string!") def get_info(self): print("Name of the person: {}".format(self._name)) print("Age of the person: {}".format(self.__age)) print("Citizenships of the person: {}".format(self.citizenship))

# object antonio of the class Person print("State 0") antonio = Person("Antonio", 25, "mexican") antonio.get_info() print("-----------------------------------------------------------------") # modify some info print("State 1") # the direct assigment does not throw an error but it does not change anything, since the attribute __age is private antonio.__age = 27 antonio.add_citizenship("german") antonio.get_info() print("-----------------------------------------------------------------") # modify some info print("State 2") #antonio.update_age("27") # this throws an error antonio.update_age(27) antonio.get_info() print("-----------------------------------------------------------------") # modify some info print("State 3") # the direct assigment does not throw an error but it does not change anything, since the attribute _name is private antonio._name = "Juan" #antonio.change_name(12345) # this throws an error antonio.change_name("Juan") antonio.get_info()

import numpy as np # Parent class class GeometricFigure: def __init__(self, name, number_edges): self.name = name self.number_edges = number_edges def get_info(self): print("Name of the figure: {}".format(self.name)) print("Number of edges: {}".format(self.number_edges)) ################################################################################################### # Children classes class Square(GeometricFigure): def __init__(self, name, number_edges, length_side): super().__init__(name, number_edges) self.length_side = length_side self.__area = 0 self.__perimeter = 0 def compute_area(self): self.__area = self.length_side ** 2 def compute_perimeter(self): self.__perimeter = 4 * self.length_side def get_info(self): super().get_info() if self.__area == 0: print("Area not computed yet!") else: print("Area: {}".format(self.__area)) if self.__perimeter == 0: print("Perimeter not computed yet!") else: print("Perimeter: {}".format(self.__perimeter)) class EquilateralTriangle(GeometricFigure): def __init__(self, name, number_edges, length_side): super().__init__(name, number_edges) self.length_side = length_side self.__area = 0 self.__perimeter = 0 def compute_area(self): self.__area = (self.length_side ** 2) * np.sin(np.pi/3)/2 def compute_perimeter(self): self.__perimeter = 3 * self.length_side def get_info(self): super().get_info() if self.__area == 0: print("Area not computed yet!") else: print("Area: {}".format(self.__area)) if self.__perimeter == 0: print("Perimeter not computed yet!") else: print("Perimeter: {}".format(self.__perimeter))

# object square_1 from class Square print("State 0") square_1 = Square("Square", 4, 5) square_1.get_info() print("-----------------------------------------------------------------") # compute area and perimeter print("State 1") square_1.compute_area() square_1.compute_perimeter() square_1.get_info() print("##################################################################") # object triangle_1 from class EquilateralTriangle print("State 0") triangle_1 = EquilateralTriangle("Equilateral Triangle", 3, 2) triangle_1.get_info() print("-----------------------------------------------------------------") # compute area and perimeter print("State 1") triangle_1.compute_area() triangle_1.compute_perimeter() triangle_1.get_info()

# Now, we use polymorphism to compute area and perimeter of the figures square_1 = Square("Square", 4, 5) square_2 = Square("Square", 4, 10) triangle_1 = EquilateralTriangle("Equilateral Triangle", 3, 2) triangle_2 = EquilateralTriangle("Equilateral Triangle", 3, 4) list_figures = [square_1, square_2, triangle_1, triangle_2] for figure in list_figures: # polymorphism applied figure.compute_area() figure.compute_perimeter() figure.get_info() print("##################################################################")