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Additional comments in "Start" and fix of incorrect values in "Finished"#7

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8 changes: 4 additions & 4 deletionsFinished/Ch 4/challenge.py
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Expand Up@@ -33,10 +33,10 @@ def __lt__(self, other):

# ~~~~~~~~~ TEST CODE ~~~~~~~~~
stocks = [
Stock("MSFT",342.0, "Microsoft Corp"),
Stock("GOOG",135.0, "Google Inc"),
Stock("META",275.0, "Meta Platforms Inc"),
Stock("AMZN",120.0, "Amazon Inc")
Stock(342.0, "MSFT", "Microsoft Corp"),
Stock(135.0, "GOOG", "Google Inc"),
Stock(275.0, "META", "Meta Platforms Inc"),
Stock(120.0, "AMZN", "Amazon Inc")
]

bonds = [
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6 changes: 4 additions & 2 deletionsStart/Ch 2/abstract_start.py
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@@ -1,15 +1,17 @@
# Python Object Oriented Programming by Joe Marini course example
# Using Abstract Base Classes to enforce class constraints

#TODO: Import "ABC"(abstract base classes) and abstractmethod from abc

#TODO: Inherit from ABC indicates that this is an abstract base class
class GraphicShape:
def __init__(self):
super().__init__()

# declaring a method as abstract requires a subclass to implement it
def calcArea(self):
pass


#TODO: Create specific versions of "calcArea" for different shapes
class Circle(GraphicShape):
def __init__(self, radius):
self.radius = radius
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9 changes: 8 additions & 1 deletionStart/Ch 2/composition_start.py
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@@ -1,7 +1,7 @@
# Python Object Oriented Programming by Joe Marini course example
# Using composition to build complex objects


#TODO: Arrange the composition of the Book class to operate on subclasses
class Book:
def __init__(self, title, price, authorfname, authorlname):
self.title = title
Expand All@@ -15,6 +15,13 @@ def __init__(self, title, price, authorfname, authorlname):
def addchapter(self, name, pages):
self.chapters.append((name, pages))

#TODO: Method for counting the total number of pages from all chapters

#TODO: Create classes "Chapter"(with attributes "name" and "pages")
# and "Author" with ("fname" and "lname") and a method __str__ returning author details


#TODO: Create an author object and add it to the book

b1 = Book("War and Peace", 39.0, "Leo", "Tolstoy")

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7 changes: 6 additions & 1 deletionStart/Ch 2/inheritance_start.py
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@@ -1,15 +1,20 @@
# Python Object Oriented Programming by Joe Marini course example
# Understanding class inheritance

#TODO: Create a class "Publication" with attributes "title" and "price"

#TODO: Create a class "Perdiodicaly" that inherits from "Publication"
# and additionally has attributes "period" and "publisher"

#TODO: Allow the "Book" class to inherit attributes from Publication
class Book:
def __init__(self, title, author, pages, price):
self.title = title
self.price = price
self.author = author
self.pages = pages


#TODO: The Magazine and Newspaper classes can inherit all atributes from "Perdiodicaly"
class Magazine:
def __init__(self, title, publisher, price, period):
self.title = title
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3 changes: 3 additions & 0 deletionsStart/Ch 2/interface_start.py
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Expand Up@@ -12,13 +12,16 @@ def __init__(self):
def calcArea(self):
pass

# TODO: Add abstract class "JSONify" with abstract method "toJSON"

class Circle(GraphicShape):
def __init__(self, radius):
self.radius = radius

def calcArea(self):
return 3.14 * (self.radius ** 2)

# TODO: Override "toJSON" method to return a JSON representation of "calcArea"


c = Circle(10)
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5 changes: 3 additions & 2 deletionsStart/Ch 2/multiple_start.py
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@@ -1,7 +1,7 @@
# Python Object Oriented Programming by Joe Marini course example
# Understanding multiple inheritance


#TODO: For A and B class create an attribute "name" that will take different values
class A:
def __init__(self):
super().__init__()
Expand All@@ -17,6 +17,7 @@ def __init__(self):
class C(A, B):
def __init__(self):
super().__init__()

#TODO: Create the method "showprops" returning the attributes it owns

c = C()
#TODO: You can use showprops() and also call "Class.__mro__" to find out all the parent classes
1 change: 1 addition & 0 deletionsStart/Ch 4/dataclass_start.py
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@@ -1,6 +1,7 @@
# Python Object Oriented Programming by Joe Marini course example
# Using data classes to represent data objects

#TODO: Import dataclasses from dataclass and apply decorator

class Book:
def __init__(self, title, author, pages, price):
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5 changes: 5 additions & 0 deletionsStart/Ch 4/datadefault_start.py
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@@ -1,8 +1,12 @@
# Python Object Oriented Programming by Joe Marini course example
# implementing default values in data classes

# TODO: Import "field" function from dataclasses
from dataclasses import dataclass

# TODO: Define a function that returns a random number between 20-40.
# Don't forget to import the necessary module


@dataclass
class Book:
Expand All@@ -11,3 +15,4 @@ class Book:
author: str
pages: int
price: float
# TODO: Use the field function to get default price as random number
2 changes: 1 addition & 1 deletionStart/Ch 4/immutable_start.py
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Expand Up@@ -10,7 +10,7 @@ class ImmutableClass:
value2: int = 0


obj = ImmutableClass()
obj = ImmutableClass() # You can set the values of frozen class only with initialization
print(obj.value1)

# TODO: attempting to change the value of an immutable class throws an exception
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