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Python Programming with Raspberry Pi

You're reading from   Python Programming with Raspberry Pi Build small yet powerful robots and automation systems with Raspberry Pi Zero

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Product type Paperback
Published in Apr 2017
Publisher Packt
ISBN-13 9781786467577
Length 312 pages
Edition 1st Edition
Languages
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Authors (2):
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Sai Yamanoor Sai Yamanoor
Author Profile Icon Sai Yamanoor
Sai Yamanoor
Srihari Yamanoor Srihari Yamanoor
Author Profile Icon Srihari Yamanoor
Srihari Yamanoor
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Toc

Table of Contents (12) Chapters Close

Preface 1. Getting Started with Python and the Raspberry Pi Zero FREE CHAPTER 2. Arithmetic Operations, Loops, and Blinky Lights 3. Conditional Statements, Functions, and Lists 4. Communication Interfaces 5. Data Types and Object-Oriented Programming in Python 6. File I/O and Python Utilities 7. Requests and Web Frameworks 8. Awesome Things You Could Develop Using Python 9. Lets Build a Robot! 10. Home Automation Using the Raspberry Pi Zero 11. Tips and Tricks

Python utilities


Python comes with several utilities that enables interacting with other files and the operating system itself. We have identified all those Python utilities that we have used in our past projects. Let's discuss the different modules and their uses as we might use them in the final project of this book.

The os module

As the name suggests, this module (https://docs.python.org/3.1/library/os.html) enables interacting with the operating system. Let's discuss some of its applications with examples.

Checking a file's existence

The os module could be used to check if a file exists in a specific directory. For example: We extensively made use of the write_file.txt file. Before opening this file to read or write, we could check the file's existence:

import os
if __name__ == "__main__":
    # Check if file exists
    if os.path.isfile('/home/pi/Desktop/code_samples/write_file.txt'):
        print('The file exists!')
    else:
        print('The file does not exist!')

In the preceding code...

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