Tiny Python Projects
eBook - ePub

Tiny Python Projects

Learn coding and testing with puzzles and games

Ken Youens-Clark

Condividi libro
  1. 440 pagine
  2. English
  3. ePUB (disponibile sull'app)
  4. Disponibile su iOS e Android
eBook - ePub

Tiny Python Projects

Learn coding and testing with puzzles and games

Ken Youens-Clark

Dettagli del libro
Anteprima del libro
Indice dei contenuti

Informazioni sul libro

"Tiny Python Projects is a gentle and amusing introduction to Python that will firm up key programming concepts while also making you giggle."—Amanda Debler, Schaeffler Key Features
Learn new programming concepts through 21-bitesize programs
Build an insult generator, a Tic-Tac-Toe AI, a talk-like-a-pirate program, and more
Discover testing techniques that will make you a better programmer
Code-along with free accompanying videos on YouTube Purchase of the print book includes a free eBook in PDF, Kindle, and ePub formats from Manning Publications. About The Book
The 21 fun-but-powerful activities in Tiny Python Projects teach Python fundamentals through puzzles and games. You'll be engaged and entertained with every exercise, as you learn about text manipulation, basic algorithms, and lists and dictionaries, and other foundational programming skills. Gain confidence and experience while you create each satisfying project. Instead of going quickly through a wide range of concepts, this book concentrates on the most useful skills, like text manipulation, data structures, collections, and program logic with projects that include a password creator, a word rhymer, and a Shakespearean insult generator. Author Ken Youens-Clark also teaches you good programming practice, including writing tests for your code as you go. What You Will Learn
Write command-line Python programs
Manipulate Python data structures
Use and control randomness
Write and run tests for programs and functions
Download testing suites for each project This Book Is Written For
For readers familiar with the basics of Python programming. About The Author
Ken Youens-Clark is a Senior Scientific Programmer at the University of Arizona. He has an MS in Biosystems Engineering and has been programming for over 20 years. Table of Contents 1 How to write and test a Python program
2 The crow's nest: Working with strings
3 Going on a picnic: Working with lists
4 Jump the Five: Working with dictionaries
5 Howler: Working with files and STDOUT
6 Words count: Reading files and STDIN, iterating lists, formatting strings
7 Gashlycrumb: Looking items up in a dictionary
8 Apples and Bananas: Find and replace
9 Dial-a-Curse: Generating random insults from lists of words
10 Telephone: Randomly mutating strings
11 Bottles of Beer Song: Writing and testing functions
12 Ransom: Randomly capitalizing text
13 Twelve Days of Christmas: Algorithm design
14 Rhymer: Using regular expressions to create rhyming words
15 The Kentucky Friar: More regular expressions
16 The Scrambler: Randomly reordering the middles of words
17 Mad Libs: Using regular expressions
18 Gematria: Numeric encoding of text using ASCII values
19 Workout of the Day: Parsing CSV files, creating text table output
20 Password strength: Generating a secure and memorable password
21 Tic-Tac-Toe: Exploring state
22 Tic-Tac-Toe redux: An interactive version with type hints

Domande frequenti

Come faccio ad annullare l'abbonamento?
È semplicissimo: basta accedere alla sezione Account nelle Impostazioni e cliccare su "Annulla abbonamento". Dopo la cancellazione, l'abbonamento rimarrà attivo per il periodo rimanente già pagato. Per maggiori informazioni, clicca qui
È possibile scaricare libri? Se sì, come?
Al momento è possibile scaricare tramite l'app tutti i nostri libri ePub mobile-friendly. Anche la maggior parte dei nostri PDF è scaricabile e stiamo lavorando per rendere disponibile quanto prima il download di tutti gli altri file. Per maggiori informazioni, clicca qui
Che differenza c'è tra i piani?
Entrambi i piani ti danno accesso illimitato alla libreria e a tutte le funzionalità di Perlego. Le uniche differenze sono il prezzo e il periodo di abbonamento: con il piano annuale risparmierai circa il 30% rispetto a 12 rate con quello mensile.
Cos'è Perlego?
Perlego è un servizio di abbonamento a testi accademici, che ti permette di accedere a un'intera libreria online a un prezzo inferiore rispetto a quello che pagheresti per acquistare un singolo libro al mese. Con oltre 1 milione di testi suddivisi in più di 1.000 categorie, troverai sicuramente ciò che fa per te! Per maggiori informazioni, clicca qui.
Perlego supporta la sintesi vocale?
Cerca l'icona Sintesi vocale nel prossimo libro che leggerai per verificare se è possibile riprodurre l'audio. Questo strumento permette di leggere il testo a voce alta, evidenziandolo man mano che la lettura procede. Puoi aumentare o diminuire la velocità della sintesi vocale, oppure sospendere la riproduzione. Per maggiori informazioni, clicca qui.
Tiny Python Projects è disponibile online in formato PDF/ePub?
Sì, puoi accedere a Tiny Python Projects di Ken Youens-Clark in formato PDF e/o ePub, così come ad altri libri molto apprezzati nelle sezioni relative a Computer Science e Programming in Python. Scopri oltre 1 milione di libri disponibili nel nostro catalogo.



1 How to write and test a Python program

Before you start working on the exercises, I want to discuss how to write programs that are documented and tested. Specifically, we’re going to
  • Write a Python program to say “Hello, World!”
  • Handle command-line arguments using argparse
  • Run tests for the code with Pytest.
  • Learn about $PATH
  • Use tools like YAPF and Black to format the code
  • Use tools like Flake8 and Pylint to find problems in the code
  • Use the new.py program to create new programs

1.1 Creating your first program

It’s pretty common to write “Hello, World!” as your first program in any language, so let’s start there. We’re going to work toward making a version that will greet whichever name is passed as an argument. It will also print a helpful message when we ask for it, and we’ll use tests to make sure it does everything correctly.
In the 01_hello directory, you’ll see several versions of the hello program we’ll write. There is also a program called test.py that we’ll use to test the program.
Start off by creating a text file called hello.py in that directory. If you are working in VS Code or PyCharm, you can use File > Open to open the 01_hello directory as a project. Both tools have something like a File > New menu option that will allow you to create a new file in that directory. It’s very important to create the hello.py file inside the 01_hello directory so that the test.py program can find it.
Once you’ve started a new file, add this line:
print('Hello, World!')
It’s time to run your new program! Open a terminal window in VS Code or PyCharm or in some other terminal, and navigate to the directory where your hello.py program is located. You can run it with the command python3 hello.py--this causes Python version 3 to execute the commands in the file named hello.py. You should see this:
$ python3 hello.py Hello, World!
Figure 1.1 shows how it looks in the Repl.it interface.
Figure 1.1 Writing and running our first program using Repl.it
If that was your first Python program, congratulations!

1.2 Comment lines

In Python, the # character and anything following it is ignored by Python. This is useful for adding comments to your code or temporarily disabling lines of code when testing and debugging. It’s always a good idea to document your programs, indicating the purpose of the program or the author’s name and email address, or both. We can use a comment for that:
# Purpose: Say hello print('Hello, World!')
If you run this program again, you should see the same output as before because the “Purpose” line is ignored. Note that any text to the left of the # is executed, so you can add a comment to the end of a line if you like.

1.3 Testing your program

The most fundamental idea I want to teach you is how to test your programs. I’ve written a test.py program in the 01_hello directory that we can use to test our new hello.py program.
We will use pytest to execute all the commands and tell us how many tests we passed. We’ll include the -v option, which tells pytest to create “verbose” output. If you run it like this, you should see the following output as the first several lines. After that will follow many more lines showing you more information about the tests that didn’t pass.
Note If you get the error “pytest: command not found,” you need to install the pytest module. Refer to the “Installing modules” section in the book’s introduction.
$ pytest -v test.py ============================= test session starts ============================== ... collected 5 items test.py::test_exists PASSED [ 20%]  test.py::test_runnable PASSED [ 40%]  test.py::test_executable FAILED [ 60%]  test.py::test_usage FAILED [ 80%]  test.py::test_input FAILED [100%]  =================================== FAILURES ===================================
The first test always checks that the expected file exists. Here the test looks for hello.py.
The second test tries to run the program with python3 hello.py and then checks if the program printed “Hello, World!” If you miss even one character, like forgetting a comma, the test will point out the error, so read carefully!
The third test checks that the program is “executable.” This test fails, so next we’ll talk about how to make that pass.
The fourth test asks the program for help and doesn’t get anything. We’re going to add the ability to print a “usage” statement that describes how to use our program.
The last test checks that the program can greet a name that we’ll pass as an argument. Since our program doesn’t yet accept arguments, we’ll need to add that, too.
I’ve written the tests in an order that I hope will help you write the program in a logical fashion. If the program doesn’t pass one of the tests, there’s no reason t...

Indice dei contenuti