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)

Iterative Functions

In the For Loops section in Chapter 1, Vital Python – Math, Strings, Conditionals, and Loops, you were introduced to the syntax for looping over objects in Python. As a refresher, here is an example where you perform five iterations and print the i variable in each loop:

for i in range(5):

You should get the following output:


For loops can also be placed within functions.

Exercise 48: A Simple Function with a for Loop

In this exercise, you create a sum_first_n function that sums up the first n integers. For example, if you pass the n=3 function, it should return 1 + 2 + 3 = 6:

  1. In a Python shell, enter the function definition. Note that the tab spacing needs to match the following output:
    def sum_first_n(n):
        result = 0
        for i in range(n):
            result += i + 1
        return result