Book Image

The Python Workshop

By : Olivier Pons, Andrew Bird, Dr. Lau Cher Han, Mario Corchero Jiménez, Graham Lee, Corey Wade
Book Image

The Python Workshop

By: Olivier Pons, Andrew Bird, Dr. Lau Cher Han, Mario Corchero Jiménez, Graham Lee, Corey Wade

Overview of this book

Have you always wanted to learn Python, but never quite known how to start? More applications than we realize are being developed using Python because it is easy to learn, read, and write. You can now start learning the language quickly and effectively with the help of this interactive tutorial. The Python Workshop starts by showing you how to correctly apply Python syntax to write simple programs, and how to use appropriate Python structures to store and retrieve data. You'll see how to handle files, deal with errors, and use classes and methods to write concise, reusable, and efficient code. As you advance, you'll understand how to use the standard library, debug code to troubleshoot problems, and write unit tests to validate application behavior. You'll gain insights into using the pandas and NumPy libraries for analyzing data, and the graphical libraries of Matplotlib and Seaborn to create impactful data visualizations. By focusing on entry-level data science, you'll build your practical Python skills in a way that mirrors real-world development. Finally, you'll discover the key steps in building and using simple machine learning algorithms. By the end of this Python book, you'll have the knowledge, skills and confidence to creatively tackle your own ambitious projects with Python.
Table of Contents (13 chapters)

Recursive Functions

When a function calls itself, it is known as a Recursive Function. This is like for loops. However, sometimes it allows you to write more elegant and terse functions than can be achieved with a loop.

You can imagine that a function that calls itself might end up in an infinite loop; it is true that you can write a recursive function that will keep running indefinitely:

def print_the_next_number(start):
        print(start + 1)
        return print_the_next_number(start + 1)

You should get the following output:



The output mentioned above is truncated.

If you run this code in a Python shell, it will continue printing integers until you interrupt the interpreter (Ctrl + C). Take a look at the preceding code and ensure you understand why it behaves in this manner. The function executes the following steps:

  • The function...