Question

1. Write a Python class, Circle, constructed by a radius and two methods which will compute the area and the perimeter of a circle. Include the constructor and other required methods to set and get class attributes. Create instances of Circle and test all the associated methods.

2. Write a Python class, Rectangle, constructed by length and width and a method which will compute the area of a rectangle. Include the constructor and other required methods to set and get class attributes. Also, include a methods isSquare(), which returns a Boolean value indicating if the shape is a square. Create instances of Rectangle and test all the associated methods.

3. Write a Python class, Printer, constructed by a string to be printed. The class has two method; (a) setString() which accepts a string from the user, and (b) printString() which prints the string in upper case or lower case, as the user chooses. Create instances of the class and test the associated methods.

4. From the previous assignment in Lab 2, Assignment 1, and Question 1, where a Laptop was modeled using UML class diagram, create a Python class with respective attributes and methods. Create instances of the classes designed and test all the associated methods.

5. Write a Python class, Person, constructed by name, surname, birthdate, address, telephone number, email. The class has methods to calculate the age of the person using his birthdate and also to display the details of a person. Create instances of the class and test the associated methods.

Answer 1

Circle.py :- implementation of Circle class in Python.

import math


class Circle:

    def __init__(self, radius):
        """
        initializes radius of circle.
        :param radius: radius of circle
        """
        self.radius = radius

    # get method for class attribute

    def get_radius(self):
        return self.radius

    # set method for class attribute
    def set_radius(self, radius):
        self.radius = radius

    def get_area(self):
        """
        calculate and return area of circle.
        :return: area of circle
        """
        area = math.pi * self.radius ** 2
        return round(area, 2)  # round area up to two decimal point and return

    def get_perimeter(self):
        """
        calculate and return perimeter of circle
        :return: perimeter of circle.
        """
        perimeter = 2 * math.pi * self.radius
        return round(perimeter, 2)  # round perimeter up to two decimal point and return


# Program entry point
if __name__ == '__main__':
    circle = Circle(5)
    print("Testing Circle methods (radius = 5)\n")
    print("get_area(): ", circle.get_area())
    print("get_perimeter(): ", circle.get_perimeter())

Sample Output :-

Please refer to the Screenshot of the code given below to understand indentation of Python code.

Rectangle.py :- implementation of Rectangle class in Python

class Rectangle:

    def __init__(self, length, width):
        """
        initializes length and width of Rectangle.
        :param length: length of rectangle
        :param width: width of rectangle
        """
        self.length = length
        self.width = width

    # set methods for class attributes

    def set_length(self, length):
        self.length = length

    def set_width(self, width):
        self.width = width

    # get methods for class attributes.

    def get_length(self):
        return self.length

    def get_width(self):
        return self.width

    def get_area(self):
        """
        calculate and return area of Rectangle.
        using formula area = length * width
        :return: area of rectangle.
        """
        area = self.length * self.width

        return area

    def is_square(self):
        """
        check if Rectangle is Square or not
        :return: True if Rectangle is Square. otherwise False.
        """
        if self.length == self.width:
            return True
        else:
            return False


# program entry point
if __name__ == '__main__':
    """
    creating instance of rectangle
    and testing method of Rectangle class.
    """
    rect = Rectangle(4, 4)
    print("Rectangle methods(length=4,height=4)")
    print("get_area(): ", rect.get_area())
    print("is_square(): ", rect.is_square())

Sample Output :-

Please refer to the Screenshot of the code given below to understand indentation of the Python code.

Printer.py :- implementation of Printer class in Python

class Printer:

    def __init__(self, string):
        self.string = string

    # method to set string
    def setString(self):
        """
        set string to be print
        :return: nothing
        """
        # ask string to be printed from user
        string = input("Please enter string to be printed: ")
        self.string = string

    # method to print string in uppercase of lowercase
    def printString(self):
        """
        print string in uppercase of lowercase as selected by user
        :return: nothing
        """
        # ask for case (uppercase or lowercase)
        print("1. for lowercase")
        print("2. for uppercase")
        option = input("Enter your choice:")

        if option == '1':
            print(self.string.lower())
        elif option == '2':
            print(self.string.upper())
        else:
            print("Invalid Input")


# Program entry point
if __name__ == '__main__':
    """
    creating instance of Printer class and calling methods
    """
    printer = Printer("Default String")
    printer.setString()
    printer.printString()

Sample Output :-

Please refer to the Screenshot of the code given below to understand indentation of the Python code

Person.py :- implemetation of Person class in Python

from datetime import date


class Person:

    def __init__(self, name, surname, birthday, address, telephone, email):
        self.name = name
        self.surname = surname
        self.birthday = birthday
        self.address = address
        self.telephone = telephone
        self.email = email

    def calculate_age(self):
        today = date.today()
        age = today.year - self.birthday.year - ((today.month, today.day) < (self.birthday.month, self.birthday.month))
        return age

    def display(self):
        """
        display details of Person
        :return: None.
        """
        print("Name: ", self.name)
        print("Surname: ", self.surname)
        print("Age: ", self.calculate_age())
        print("Address: ", self.address)
        print("Telephone Number: ", self.telephone)
        print("Email: ", self.email)


# Program entry point

if __name__ == '__main__':
    """
    Creating instance of Person class and testing it's methods
    """
    person = Person("Anonymous", "Surname", date(1998, 11, 12), "This is the Person's address", "123456",
                    "[email protected]")
    print("calculate_age()", person.calculate_age())
    print("Person information")
    person.display()

Sample Output :-

Please refer to the Screenshot of the code given below to understand indentation of the Python Code.

Answer 2

Circle.py :- implementation of Circle class in Python.

import math


class Circle:

    def __init__(self, radius):
        """
        initializes radius of circle.
        :param radius: radius of circle
        """
        self.radius = radius

    # get method for class attribute

    def get_radius(self):
        return self.radius

    # set method for class attribute
    def set_radius(self, radius):
        self.radius = radius

    def get_area(self):
        """
        calculate and return area of circle.
        :return: area of circle
        """
        area = math.pi * self.radius ** 2
        return round(area, 2)  # round area up to two decimal point and return

    def get_perimeter(self):
        """
        calculate and return perimeter of circle
        :return: perimeter of circle.
        """
        perimeter = 2 * math.pi * self.radius
        return round(perimeter, 2)  # round perimeter up to two decimal point and return


# Program entry point
if __name__ == '__main__':
    circle = Circle(5)
    print("Testing Circle methods (radius = 5)\n")
    print("get_area(): ", circle.get_area())
    print("get_perimeter(): ", circle.get_perimeter())

Sample Output :-

Testing Circle methods (radius 5) get_area(): 78.54 get_perimeter(): 31.42|| Process finished with exit code 0

Please refer to the Screenshot of the code given below to understand indentation of Python code.

1 import math 3 4 class Circle: 5 definit__(self, radius): 6 7 8 initializes radius of circle. :param radius: radius of circle self.radius = radius # get method for class attribute def get_radius(self): return self.radius 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 # set method for class attribute def set_radius(self, radius): self.radius = radius def get_area(self): calculate and return area of circle. :return: area of circle area = math.pi * self.radius ** 2

A return round(area, 2) # round area up to two decimal point and return 28 29 def get_perimeter(self): 30 31 calculate and return perimeter of circle :return: perimeter of circle. A 32 33 34 35 36 37 38 perimeter = 2 * math.pi * self.radius return round(perimeter, 2) # round perimeter up to two decimal point and return 39 40 41 # Program entry point if __name__ == '__main__': circle = Circle(5) print("Testing Circle methods (radius = 5)\n") print("get_area(): ", circle.get_area() print("get_perimeter(: ", circle.get_perimeter() 42 43

Rectangle.py :- implementation of Rectangle class in Python

class Rectangle:

    def __init__(self, length, width):
        """
        initializes length and width of Rectangle.
        :param length: length of rectangle
        :param width: width of rectangle
        """
        self.length = length
        self.width = width

    # set methods for class attributes

    def set_length(self, length):
        self.length = length

    def set_width(self, width):
        self.width = width

    # get methods for class attributes.

    def get_length(self):
        return self.length

    def get_width(self):
        return self.width

    def get_area(self):
        """
        calculate and return area of Rectangle.
        using formula area = length * width
        :return: area of rectangle.
        """
        area = self.length * self.width

        return area

    def is_square(self):
        """
        check if Rectangle is Square or not
        :return: True if Rectangle is Square. otherwise False.
        """
        if self.length == self.width:
            return True
        else:
            return False


# program entry point
if __name__ == '__main__':
    """
    creating instance of rectangle
    and testing method of Rectangle class.
    """
    rect = Rectangle(4, 4)
    print("Rectangle methods(length=4,height=4)")
    print("get_area(): ", rect.get_area())
    print("is_square(): ", rect.is_square())

Sample Output :-

Rectangle methods (length=4, height=4) get_area(): 16 is_square(): True Process finished with exit code 0

Please refer to the Screenshot of the code given below to understand indentation of the Python code.

1 class Rectangle: 3 def __init__(self, length, width) : 5 6 initializes length and width of Rectangle. :param length: length of rectangle :param width: width of rectangle 8 e self.length = length self.width = width # set methods for class attributes def set_length(self, length): self.length = length A 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 def set_width(self, width): self.width = width # get methods for class attributes. def get_length(self): return self.length 24 25 def get_width(self): return self.width G 26 27

def get_area(self): 28 29 30 31 calculate and return area of Rectangle. using formula area = length * width :return: area of rectangle. 32 33 A area = self.length * self.width return area A 34 35 36 37 38 39 40 def is_square(self): check if Rectangle is Square or not :return: True if Rectangle is Square, otherwise False. A 41 42 43 if self.length == self.width: return True else: return false 44 45 46 47

48 49 # program entry point Pif -_name__ == '__main__': 50 51 creating instance of rectangle and testing method of Rectangle class. 52 53 54 A 55 56 57 58 rect = Rectangle(4, 4) print("Rectangle methods (length=4, height=4)") print("get_area(): ", rect.get_area() print("is_square(): ", rect.is_square()) A

Printer.py :- implementation of Printer class in Python

class Printer:

    def __init__(self, string):
        self.string = string

    # method to set string
    def setString(self):
        """
        set string to be print
        :return: nothing
        """
        # ask string to be printed from user
        string = input("Please enter string to be printed: ")
        self.string = string

    # method to print string in uppercase of lowercase
    def printString(self):
        """
        print string in uppercase of lowercase as selected by user
        :return: nothing
        """
        # ask for case (uppercase or lowercase)
        print("1. for lowercase")
        print("2. for uppercase")
        option = input("Enter your choice:")

        if option == '1':
            print(self.string.lower())
        elif option == '2':
            print(self.string.upper())
        else:
            print("Invalid Input")


# Program entry point
if __name__ == '__main__':
    """
    creating instance of Printer class and calling methods
    """
    printer = Printer("Default String")
    printer.setString()
    printer.printString()

Sample Output :-

Please enter string to be printed: Python is a Programming Language 1. for lowercase 2. for uppercase Enter your choice: 2 PYTHON IS A PROGRAMMING LANGUAGE Process finished with exit code 0

Please refer to the Screenshot of the code given below to understand indentation of the Python code

class Printer: 2 3 4 def _init__(self, string): self.string = string 5 6 # method to set string def setString(self): set string to be print :return: nothing 8 9 10 11 12 13 14 15 16 17 18 # ask string to be printed from user string = input("Please enter string to be printed: ") self.string = string # method to print string in uppercase of lowercase def printString(self): print string in uppercase of lowercase as selected by user :return: nothing 19 20 21 22 23 24 25 26 27 # ask for case (uppercase or lowercase) print("1. for lowercase") print("2. for uppercase") option = input("Enter your choice:") if option == '1':

28 29 30 print(self.string. lower() elif option == '2': print(self.string.upper() else: print("Invalid Input") 31 32 33 34 # Program entry point Hif __name__ == '__main__': 35 36 37 38 creating instance of Printer class and calling methods 39 40 41 printer - Printer("Default String") printer.setString() printer.printString() 42 A

Person.py :- implemetation of Person class in Python

from datetime import date


class Person:

    def __init__(self, name, surname, birthday, address, telephone, email):
        self.name = name
        self.surname = surname
        self.birthday = birthday
        self.address = address
        self.telephone = telephone
        self.email = email

    def calculate_age(self):
        today = date.today()
        age = today.year - self.birthday.year - ((today.month, today.day) < (self.birthday.month, self.birthday.month))
        return age

    def display(self):
        """
        display details of Person
        :return: None.
        """
        print("Name: ", self.name)
        print("Surname: ", self.surname)
        print("Age: ", self.calculate_age())
        print("Address: ", self.address)
        print("Telephone Number: ", self.telephone)
        print("Email: ", self.email)


# Program entry point

if __name__ == '__main__':
    """
    Creating instance of Person class and testing it's methods
    """
    person = Person("Anonymous", "Surname", date(1998, 11, 12), "This is the Person's address", "123456",
                    "[email protected]")
    print("calculate_age()", person.calculate_age())
    print("Person information")
    person.display()

Sample Output :-

calculate_age() 21 Person information Name: Anonymous Surname: Surname Age: 21 Address: This is the person's address Telephone Number: 123456 Email: [email protected] Process finished with exit code 0 |

Please refer to the Screenshot of the code given below to understand indentation of the Python Code.

1 from datetime import date class Person: 6 7 8 9 definit__(self, name, surname, birthday, address, telephone, email): self.name = name self.surname = surname self.birthday = birthday self.address = address self.telephone = telephone self.email = email A def calculate_age(self): today = date.today age = today.year - self.birthday .year - ((today.month, today.day) < (self.birthday.month, self.birthday.month)) return age 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 def display (self): display details of Person :return: None. print("Name: ", self.name) print("Surname: ", self.surname) print("Age: ", self.calculate_age() print("Address: ", self.address)

print("Telephone Number: ", self.telephone) print("Email: ", self.email) # Program entry point Gif __name__ == __main__': 28 29 30 31 32 33 34 35 36 37 38 39 40 41 Creating instance of Person class and testing it's methods person = Person("Anonymous", "Surname", date(1998, 11, 12), "This is the person's address", "123456", "[email protected]") print("calculate_age (", person.calculate_age()) print("Person information") person.display 42 E