update challenge descriptions

Author: joemarini

Start/Ch 1/challenge.py

@@ -1,6 +1,13 @@
 # Python Object Oriented Programming by Joe Marini course example
 # Programming challenge: define a class to represent a stock symbol
 
+# Challenge: create a class to represent stock information.
+# Your class should have properties for:
+# Ticker (string)
+# Price (float)
+# Company (string)
+# And a method get_description() which returns a string in the form
+# of "Ticker: Company -- $Price"
 
 class Stock:
     pass

Start/Ch 2/challenge.py

@@ -1,7 +1,16 @@
 # Python Object Oriented Programming by Joe Marini course example
 # Programming challenge: use inheritance and abstract classes
 
-from abc import ABC, abstractmethod
+# Challenge: create a class structure to represent stocks and bonds
+# Requirements:
+# -- Both stocks and bonds have a price
+# -- Stocks have a company name and ticker
+# -- Bonds have a description, duration, and yield
+# -- You should not be able to instantiate the base class
+# -- Subclasses are required to override get_description()
+# -- get_description returns formats for stocks and bonds
+# For stocks: "Ticker: Company -- $Price"
+# For bonds: "description: duration'yr' : $price : yieldamt%"
 
 class Asset():
     pass

Start/Ch 3/challenge.py

@@ -1,6 +1,10 @@
 # Python Object Oriented Programming by Joe Marini course example
 # Programming challenge: add methods for comparison and equality
 
+# Challenge: use a magic method to make stocks and bonds sortable
+# Stocks should sort from low to high on price
+# Bonds should sort from low to high on yield
+
 from abc import ABC, abstractmethod
 
 

Start/Ch 4/challenge.py

@@ -1,19 +1,20 @@
 # Python Object Oriented Programming by Joe Marini course example
 # Programming challenge: implement a dataclass
 
-from dataclasses import dataclass
-from abc import ABC, abstractmethod
+# Challenge: convert your classes to dataclasses
+# The subclasses are required to override the magic method
+# that makes them sortable
 
 class Asset():
     pass
 
 
 class Stock(Asset):
-   pass
+    pass
 
 
 class Bond(Asset):
-   pass
+    pass
 
 # ~~~~~~~~~ TEST CODE ~~~~~~~~~
 stocks = [