zev/practical-python
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

Links and renumbering

Browse Source
This commit is contained in:
David Beazley
2020-05-26 15:30:14 -05:00
parent 9c032f7a23
commit 45c7ec1f4a
10 changed files with 49 additions and 42 deletions
Download Patch File Download Diff File Expand all files Collapse all files

10
Notes/04_Classes_objects/02_Inheritance.md
View File

@@ -220,7 +220,7 @@ We're not going to explore multiple inheritance further in this course.
## Exercises
### (a) Print Portfolio
### Exercise 4.4: Print Portfolio
A major use of inheritance is in writing code that’s meant to be extended or customized in various ways—especially in libraries or frameworks.
To illustrate, start by adding the following function to your `stock.py` program:
@@ -263,7 +263,7 @@ When you run your `stock.py`, you should get this output:
IBM 100 70.44
```
### (b) An Extensibility Problem
### Exercise 4.5: An Extensibility Problem
Suppose that you wanted to modify the `print_portfolio()` function to
support a variety of different output formats such as plain-text,
@@ -329,7 +329,7 @@ if __name__ == '__main__':
When you run this new code, your program will immediately crash with a `NotImplementedError` exception.
That’s not too exciting, but continue to the next part.
### (c) Using Inheritance to Produce Different Output
### Exercise 4.6: Using Inheritance to Produce Different Output
The `TableFormatter` class you defined in part (a) is meant to be extended via inheritance.
In fact, that’s the whole idea. To illustrate, define a class `TextTableFormatter` like this:
@@ -430,7 +430,7 @@ Using a similar idea, define a class `HTMLTableFormatter` that produces a table
Test your code by modifying the main program to create a `HTMLTableFormatter` object instead of a `CSVTableFormatter` object.
### (d) Polymorphism in Action
### Exercise 4.7: Polymorphism in Action
A major feature of object-oriented programming is that you can plug an
object into a program and it will work without having to change any of
@@ -499,4 +499,4 @@ That said, understanding what happened in this exercise will take you
pretty far in terms of using most library modules and knowing
what inheritance is good for (extensibility).
[Next](03_Special_methods)
[Contents](../Contents) \| [Previous (4.1 Classes)](01_Class) \| [Next (4.3 Special methods)](03_Special_methods)