import numpy as np class Circle: # Constructor: a special type of subroutine called to create an object def __init__(self, radius): # class attributes (or variables of the class) self.radius = radius self.area = 0 self.perimeter = 0 # Methods of the class def compute_area(self): self.area = np.pi * self.radius ** 2 def compute_perimeter(self): self.perimeter = 2 * np.pi * self.radius def get_info(self): print() print("Radius of the circle = {}".format(self.radius)) print("Area of the circle = {}".format(round(self.area, 3))) print("Perimeter of the circle = {}".format(round(self.perimeter, 3)))

# First instance of the class Circle circle1 = Circle(3) circle1.compute_area() circle1.compute_perimeter() circle1.get_info() # Second instance of the class Circle circle2 = Circle(5) circle2.compute_area() circle2.compute_perimeter() circle2.get_info()

# code to get the class of the objects print (type(circle1)) print(type (circle2)) x = 5 print(type(x))

# Class class Person: # Constructor: a special type of subroutine called to create an object def __init__(self, name_par, age_par, citizenship_par): # class attributes (or variables of the class) self.name = name_par self.age = age_par self.citizenship = {citizenship_par} # 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))

# object kevin of the class Person print("State 0") kevin = Person("Kevin", 25, "indonesian") 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.update_age(29) kevin.add_citizenship("german") kevin.get_info() print("-----------------------------------------------------------------") # modify some info print("State 3") kevin.remove_citizenship("german") kevin.get_info()

# object antonio of the class Person print("State 0") antonio = Person("Antonio", 23, "mexican") antonio.get_info() print("-----------------------------------------------------------------") # modify some info print("State 1") antonio.update_age(25) antonio.add_citizenship("french") antonio.get_info() print("-----------------------------------------------------------------") # modify some info print("State 2") antonio.update_age(27) antonio.add_citizenship("german") antonio.get_info() print("-----------------------------------------------------------------") # modify some info print("State 3") antonio.remove_citizenship("french") antonio.get_info()

# define the class Student with the following attributes and methods # Attributes: # - Person # - Major (name) # - School (name) # Methods: # - a method to change the major of the student # - a method to change the school of the student # - a method to get the info about the object # Test the class with two different instances (objects)

class Student: def __init__(self, person, major, school): self.person = person # from class Person self.major = major # a string self.school = school # a string def change_major(self, new_major): self.major = new_major def change_school(self, new_school): self.school = new_school def get_info(self): print("Infor about {}".format(self.person.name)) self.person.get_info() print("Major: ", self.major) print("School: ", self.school)

kevin_student = Student(kevin, "Physics", "Heidelberg University") kevin_student.get_info()