Object oriented Python Exercise

Author: Deepali-Srivastava

exercise-code/E1-1.py

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+# Copyright (C) Deepali Srivastava - All Rights Reserved
+# This code is part of Python course available on CourseGalaxy.com
+
+class BankAccount:
+    def set_details(self, name, balance=0):
+        self.name = name
+        self.balance = balance
+
+    def display(self):
+         print(self.name, self.balance)
+
+    def withdraw(self, amount):
+        self.balance -= amount
+
+    def deposit(self, amount):
+        self.balance += amount
+    
+a1 = BankAccount()
+a1.set_details('Mike', 200)
+
+a2 = BankAccount()
+a2.set_details('Tom')
+
+a1.display()
+a2.display()
+
+a1.withdraw(100)
+a2.deposit(500)
+
+a1.display()
+a2.display()
+
+

exercise-code/E2-1.py

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+# Copyright (C) Deepali Srivastava - All Rights Reserved
+# This code is part of Python course available on CourseGalaxy.com
+
+class BankAccount:
+    def __init__(self, name, balance=0):
+        self.name = name
+        self.balance = balance
+
+    def display(self):
+         print(self.name, self.balance)
+
+    def withdraw(self, amount):
+        self.balance -= amount
+
+    def deposit(self, amount):
+        self.balance += amount
+    
+a1 = BankAccount('Mike', 200)
+a2 = BankAccount('Tom')
+
+a1.display()
+a2.display()
+
+a1.withdraw(100)
+a2.deposit(500)
+
+a1.display()
+a2.display()

exercise-code/E2-10.py

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+# Copyright (C) Deepali Srivastava - All Rights Reserved
+# This code is part of Python course available on CourseGalaxy.com
+
+class Circle:
+    def __init__(self, radius):
+        self.radius = radius
+
+    @property
+    def radius(self):
+        return self._radius
+
+    @radius.setter
+    def radius(self, new_radius):
+        if new_radius > 0:
+            self._radius = new_radius
+        else:
+            raise ValueError('Radius should be positive')
+
+    @property
+    def diameter(self):
+        return self._radius * 2
+
+    @property
+    def circumference(self):
+        return 2 * 3.14 * self._radius
+
+    def area(self):
+        return 3.14 * self._radius * self._radius
+
+c1 = Circle(7)
+print( c1.radius, c1.diameter, c1.circumference, c1.area() )
+

exercise-code/E2-2.py

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+# Copyright (C) Deepali Srivastava - All Rights Reserved
+# This code is part of Python course available on CourseGalaxy.com
+
+class Book:
+    def __init__(self,isbn, title,author,publisher,pages,price,copies):
+        self.isbn = isbn
+        self.title = title
+        self.author = author
+        self.publisher = publisher
+        self.pages = pages
+        self.price = price
+        self.copies = copies
+   
+    def display(self):
+        print(self.title)
+        print(f'ISBN : {self.isbn}')
+        print(f'Price : {self.price}')
+        print(f'Number of copies : {self.copies}')
+        print('.' * 50)
+
+
+book1 = Book('957-4-36-547417-1', 'Learn Physics','Stephen', 'CBC', 350, 200,10)
+book2 = Book('652-6-86-748413-3', 'Learn Chemistry','Jack', 'CBC', 400, 220,20)
+book3 = Book('957-7-39-347216-2', 'Learn Maths','John', 'XYZ', 500, 300,5)
+book4 = Book('957-7-39-347216-2', 'Learn Biology','Jack', 'XYZ', 400, 200,6)
+
+book1.display()
+book2.display()
+book3.display()
+book4.display()
+

exercise-code/E2-3.py

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+# Copyright (C) Deepali Srivastava - All Rights Reserved
+# This code is part of Python course available on CourseGalaxy.com
+
+class Book:
+    
+    def __init__(self,isbn, title,author,publisher,pages,price,copies):
+        self.isbn = isbn
+        self.title = title
+        self.author = author
+        self.publisher = publisher
+        self.pages = pages
+        self.price = price
+        self.copies = copies
+   
+    def display(self):
+        print(self.title)
+        print(f'ISBN : {self.isbn}')
+        print(f'Price : {self.price}')
+        print(f'Number of copies : {self.copies}')
+        print('.' * 50)
+
+    def in_stock(self):
+        return True if self.copies>0 else False
+
+    def sell(self):
+        if self.in_stock():
+            self.copies -= 1
+        else:
+            print('The book is out of stock')
+
+
+book1 = Book('957-4-36-547417-1', 'Learn Physics','Stephen', 'CBC', 350, 200,10)
+book2 = Book('652-6-86-748413-3', 'Learn Chemistry','Jack', 'CBC', 400, 220,20)
+book3 = Book('957-7-39-347216-2', 'Learn Maths','John', 'XYZ', 500, 300,5)
+book4 = Book('957-7-39-347216-2', 'Learn Biology','Jack', 'XYZ', 400, 200,6)
+
+book1.display()
+book2.display()
+book3.display()
+book4.display()
+
+
+book3.sell()
+book3.sell()
+book3.sell()
+book3.sell()
+book3.sell()
+book3.sell()

exercise-code/E2-4.py

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+# Copyright (C) Deepali Srivastava - All Rights Reserved
+# This code is part of Python course available on CourseGalaxy.com
+
+class Book:
+    
+    def __init__(self,isbn, title,author,publisher,pages,price,copies):
+        self.isbn = isbn
+        self.title = title
+        self.author = author
+        self.publisher = publisher
+        self.pages = pages
+        self.price = price
+        self.copies = copies
+   
+    def display(self):
+        print(self.title)
+        print(f'ISBN : {self.isbn}')
+        print(f'Price : {self.price}')
+        print(f'Number of copies : {self.copies}')
+        print('.' * 50)
+
+
+book1 = Book('957-4-36-547417-1', 'Learn Physics','Stephen', 'CBC', 350, 200,10)
+book2 = Book('652-6-86-748413-3', 'Learn Chemistry','Jack', 'CBC', 400, 220,20)
+book3 = Book('957-7-39-347216-2', 'Learn Maths','John', 'XYZ', 500, 300,5)
+book4 = Book('957-7-39-347216-2', 'Learn Biology','Jack', 'XYZ', 400, 200,6)
+
+book1.display()
+book2.display()
+book3.display()
+book4.display()
+
+
+books = [book1, book2, book3, book4]
+
+for book in books:
+    book.display()
+
+jack_books = [book.title for book in books if book.author == 'Jack']
+
+print(jack_books)
+

exercise-code/E2-5.py

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+# Copyright (C) Deepali Srivastava - All Rights Reserved
+# This code is part of Python course available on CourseGalaxy.com
+
+class Book:
+    def __init__(self,isbn, title,author,publisher,pages,price,copies):
+        self.isbn = isbn
+        self.title = title
+        self.author = author
+        self.publisher = publisher
+        self.pages = pages
+        self.price = price
+        self.copies = copies
+   
+    def display(self):
+        print(self.title)
+        print(f'ISBN : {self.isbn}')
+        print(f'Price : {self._price}')
+        print(f'Number of copies : {self.copies}')
+        print('.' * 50)
+
+    @property
+    def price(self):
+           return self._price
+
+    @price.setter
+    def price(self, new_price):
+          if 10 <= new_price <= 500:
+              self._price = new_price
+          else:
+               raise ValueError('Price cannot be less than 10 or more than 500')
+
+book1 = Book('957-4-36-547417-1', 'Learn Physics','Stephen', 'CBC', 350, 200,10)
+book2 = Book('652-6-86-748413-3', 'Learn Chemistry','Jack', 'CBC', 400, 220,20)
+book3 = Book('957-7-39-347216-2', 'Learn Maths','John', 'XYZ', 500, 300,5)
+book4 = Book('957-7-39-347216-2', 'Learn Biology','Jack', 'XYZ', 400, 20,6)
+
+book1.display()
+book2.display()
+book3.display()
+book4.display()
+
+

exercise-code/E2-6.py

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+# Copyright (C) Deepali Srivastava - All Rights Reserved
+# This code is part of Python course available on CourseGalaxy.com
+
+class Fraction:
+    def __init__(self,nr,dr=1):
+        self.nr = nr
+        self.dr = dr
+        if self.dr < 0:    
+            self.nr *= -1
+            self.dr *= -1
+
+    def show(self):
+        print(f'{self.nr}/{self.dr}')
+       
+f1 = Fraction(2,3)
+f1.show()
+f2 = Fraction(2,-3)
+f2.show()
+f3 = Fraction(-5,-6)
+f3.show()

exercise-code/E2-7.py

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+# Copyright (C) Deepali Srivastava - All Rights Reserved
+# This code is part of Python course available on CourseGalaxy.com
+
+class Fraction:
+    def __init__(self,nr,dr=1):
+        self.nr = nr
+        self.dr = dr
+        if self.dr < 0:    
+            self.nr *= -1
+            self.dr *= -1
+
+    def show(self):
+        print(f'{self.nr}/{self.dr}')
+
+    def multiply(self,other):
+        if isinstance(other,int):
+            other = Fraction(other)
+        return Fraction(self.nr * other.nr , self.dr * other.dr)
+
+    def add(self,other):
+        if isinstance(other,int):
+            other = Fraction(other)
+        return Fraction(self.nr * other.dr + other.nr * self.dr, self.dr * other.dr)
+
+       
+f1 = Fraction(2,3)
+f1.show()
+f2 = Fraction(2,-3)
+f2.show()
+f3 = Fraction(-5,-6)
+f3.show()
+
+

exercise-code/E2-8.py

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+# Copyright (C) Deepali Srivastava - All Rights Reserved
+# This code is part of Python course available on CourseGalaxy.com
+
+class Product():
+    def __init__(self, id, marked_price, discount):
+        self.id = id
+        self.marked_price = marked_price
+        self.discount = discount
+        
+    @property
+    def selling_price(self):
+        return self.marked_price - 0.01 * self.discount * self.marked_price
+    
+    def display(self):
+        print(self.id,  self.marked_price,  self.discount)
+    
+p1 = Product('A234', 100, 5)
+p2 = Product('X879', 400, 6)
+p3 = Product('B987', 990, 4)
+p4 = Product('H456', 800, 6)
+
+print(p1.id, p1.selling_price)
+print(p2.id, p2.selling_price)
+print(p3.id, p3.selling_price)
+print(p4.id, p4.selling_price)

exercise-code/E2-9.py

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+# Copyright (C) Deepali Srivastava - All Rights Reserved
+# This code is part of Python course available on CourseGalaxy.com
+
+class Product():
+    def __init__(self, id, marked_price, discount):
+        self.id = id
+        self.marked_price = marked_price
+        self._discount = discount
+        
+    @property
+    def selling_price(self):
+        return self.marked_price - 0.01 * self.discount * self.marked_price
+
+    @property
+    def discount(self):
+        return self._discount+2 if self.marked_price > 500 else self._discount
+
+    @discount.setter
+    def discount(self, new_discount):
+        self._discount = new_discount
+        
+    def display(self):
+        print(self.id, self.marked_price, self.discount)
+
+p1 = Product('A234', 100, 5)
+p2 = Product('X879', 400, 6)
+p3 = Product('B987', 990, 4)
+p4 = Product('H456', 800, 6)
+
+print(p1.id, p1.selling_price)
+print(p2.id, p2.selling_price)
+print(p3.id, p3.selling_price)
+print(p4.id, p4.selling_price)
+
+p4.discount = 10
+print(p4.id, p4.selling_price)