Jun 14, 2024
diff --git a/.vscode/settings.json b/.vscode/settings.json
  "files.autoSave": "afterDelay",
  "screencastMode.onlyKeyboardShortcuts": true,
  "terminal.integrated.fontSize": 18,
  "workbench.activityBar.visible": true,
  "workbench.colorTheme": "Default Light Modern",
  "workbench.fontAliasing": "antialiased",
  "workbench.statusBar.visible": true,
diff --git a/Start/Ch 1/class_start.py b/Start/Ch 1/class_start.py

 class Book:
    # TODO: Properties defined at the class level are shared by all instances
    BOOK_TYPES = ("HARDCOVER","PAPERBACK","EBOOK")

    # TODO: double-underscore properties are hidden from other classes
    __booklist = None

    # TODO: create a class method
    @classmethod
    def get_book_types(cls):
        return cls.BOOK_TYPES

    # TODO: create a static method
    def getbooklist():
        if Book.__booklist == None:
            Book.__booklist = []
        return Book.__booklist

    # instance methods receive a specific object instance as an argument
    # and operate on data specific to that object instance
    def set_title(self, newtitle):
        self.title = newtitle

    def __init__(self, title):
    def __init__(self, title, booktype):
        self.title = title
        if (not booktype in Book.BOOK_TYPES):
            raise ValueError(f"{booktype} is not a valid book type!")
        else:
            self.booktype = booktype

    # def __repr__(self):
    #     return f"Book(title={self.title})"

 # TODO: access the class attribute

 print("Book Types: ", Book.get_book_types())

 # TODO: Create some book instances

 b1 = (Book("Title1", "HARDCOVER"))
 b2 = (Book("Title2", "PAPERBACK"))
 # print(b1.title)
 # print(b1.booktype)

 # TODO: Use the static method to access a singleton object
 thebooks = Book.getbooklist()
 thebooks.append(b1)
 thebooks.append(b2)
 print(thebooks)
diff --git a/Start/Ch 1/definition_start.py b/Start/Ch 1/definition_start.py


 # TODO: create a basic class

 class Book:
  def __init__(self, title):
    self.title = title

 # TODO: create instances of the class

 book1 = Book("Brave New World")
 book2 = Book("War and Peace")

 # TODO: print the class and property
 print(book1)
 print(book1.title)
diff --git a/Start/Ch 1/instance_start.py b/Start/Ch 1/instance_start.py
 class Book:
    # the "init" function is called when the instance is
    # created and ready to be initialized
    def __init__(self, title):
    def __init__(self, title, author, pages, price):
        self.title = title
        # TODO: add properties
        self.author = author
        self.pages = pages
        self.price = price
        self.__secret = "This is a secret value."

    # TODO: create instance methods
    def getprice(self):
        if hasattr(self,"_discount"):
            return self.price - (self.price * self._discount)
        else:
            return self.price

    def setdiscount(self, amount):
        self._discount = amount


 # TODO: create some book instances
 b1 = Book("War and Peace")
 b2 = Book("The Catcher in the Rye")
 b1 = Book("War and Peace","Leo Tolstoy",1225,39.95)
 b2 = Book("The Catcher in the Rye","JD Salinger",234,29.95)

 # TODO: print the price of book1

 print(b1.getprice())

 # TODO: try setting the discount

 print(b2.getprice())
 b2.setdiscount(0.25)
 print(b2.getprice())

 # TODO: properties with double underscores are hidden by the interpreter
 print(b2._Book__secret)
diff --git a/Start/Ch 1/typecheck_start.py b/Start/Ch 1/typecheck_start.py
 n2 = Newspaper("The New York Times")

 # TODO: use type() to inspect the object type
 #print(type(b1))
 #print(type(n1))


 # TODO: compare two types together

 #print(type(b1) == type(b2))
 #print(type(b1) == type(n2))

 # TODO: use isinstance to compare a specific instance to a known type
 print(isinstance(b1,Book))
 print(isinstance(n1,Newspaper))
 print(isinstance(n2,Book))
 print(isinstance(n2,object))
Original file line number	Diff line number	Diff line change
Expand Up		@@ -17,7 +17,6 @@
		"files.autoSave": "afterDelay",
		"screencastMode.onlyKeyboardShortcuts": true,
		"terminal.integrated.fontSize": 18,
		"workbench.activityBar.visible": true,
		"workbench.colorTheme": "Default Light Modern",
		"workbench.fontAliasing": "antialiased",
		"workbench.statusBar.visible": true,
Expand Down
Original file line number	Diff line number	Diff line change
Expand Up		@@ -4,26 +4,48 @@

		class Book:
		# TODO: Properties defined at the class level are shared by all instances
		BOOK_TYPES = ("HARDCOVER","PAPERBACK","EBOOK")

		# TODO: double-underscore properties are hidden from other classes
		__booklist = None

		# TODO: create a class method
		@classmethod
		def get_book_types(cls):
		return cls.BOOK_TYPES

		# TODO: create a static method
		def getbooklist():
		if Book.__booklist == None:
		Book.__booklist = []
		return Book.__booklist

		# instance methods receive a specific object instance as an argument
		# and operate on data specific to that object instance
		def set_title(self, newtitle):
		self.title = newtitle

		def __init__(self, title):
		def __init__(self, title, booktype):
		self.title = title
		if (not booktype in Book.BOOK_TYPES):
		raise ValueError(f"{booktype} is not a valid book type!")
		else:
		self.booktype = booktype

		# def __repr__(self):
		# return f"Book(title={self.title})"

		# TODO: access the class attribute

		print("Book Types: ", Book.get_book_types())

		# TODO: Create some book instances

		b1 = (Book("Title1", "HARDCOVER"))
		b2 = (Book("Title2", "PAPERBACK"))
		# print(b1.title)
		# print(b1.booktype)

		# TODO: Use the static method to access a singleton object
		thebooks = Book.getbooklist()
		thebooks.append(b1)
		thebooks.append(b2)
		print(thebooks)
Original file line number	Diff line number	Diff line change
Expand Up		@@ -3,9 +3,14 @@


		# TODO: create a basic class

		class Book:
		def __init__(self, title):
		self.title = title

		# TODO: create instances of the class

		book1 = Book("Brave New World")
		book2 = Book("War and Peace")

		# TODO: print the class and property
		print(book1)
		print(book1.title)
Original file line number	Diff line number	Diff line change
Expand Up		@@ -5,21 +5,35 @@
		class Book:
		# the "init" function is called when the instance is
		# created and ready to be initialized
		def __init__(self, title):
		def __init__(self, title, author, pages, price):
		self.title = title
		# TODO: add properties
		self.author = author
		self.pages = pages
		self.price = price
		self.__secret = "This is a secret value."

		# TODO: create instance methods
		def getprice(self):
		if hasattr(self,"_discount"):
		return self.price - (self.price * self._discount)
		else:
		return self.price

		def setdiscount(self, amount):
		self._discount = amount


		# TODO: create some book instances
		b1 = Book("War and Peace")
		b2 = Book("The Catcher in the Rye")
		b1 = Book("War and Peace","Leo Tolstoy",1225,39.95)
		b2 = Book("The Catcher in the Rye","JD Salinger",234,29.95)

		# TODO: print the price of book1

		print(b1.getprice())

		# TODO: try setting the discount

		print(b2.getprice())
		b2.setdiscount(0.25)
		print(b2.getprice())

		# TODO: properties with double underscores are hidden by the interpreter
		print(b2._Book__secret)
Original file line number	Diff line number	Diff line change
Expand Up		@@ -19,9 +19,17 @@ def __init__(self, name):
		n2 = Newspaper("The New York Times")

		# TODO: use type() to inspect the object type
		#print(type(b1))
		#print(type(n1))


		# TODO: compare two types together

		#print(type(b1) == type(b2))
		#print(type(b1) == type(n2))

		# TODO: use isinstance to compare a specific instance to a known type
		print(isinstance(b1,Book))
		print(isinstance(n1,Newspaper))
		print(isinstance(n2,Book))
		print(isinstance(n2,object))