Main

.vscode/settings.json

@@ -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,

Start/Ch 1/class_start.py

@@ -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)

Start/Ch 1/definition_start.py

@@ -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)

Start/Ch 1/instance_start.py

@@ -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)

Start/Ch 1/typecheck_start.py

@@ -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))
+