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  • Book Overview & Buying Getting Started with Python and Raspberry Pi (Redirected from Learning Python By Developing Raspberry Pi Applications)
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Getting Started with Python and Raspberry Pi (Redirected from Learning Python By Developing Raspberry Pi Applications)

Getting Started with Python and Raspberry Pi (Redirected from Learning Python By Developing Raspberry Pi Applications)

By : Nixon
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Getting Started with Python and Raspberry Pi (Redirected from Learning Python By Developing Raspberry Pi Applications)

Getting Started with Python and Raspberry Pi (Redirected from Learning Python By Developing Raspberry Pi Applications)

3 (1)
By: Nixon
Buy this Book

Overview of this book

The Raspberry Pi is one of the smallest and most affordable single board computers that has taken over the world of hobby electronics and programming, and the Python programming language makes this the perfect platform to start coding with. The book will start with a brief introduction to Raspberry Pi and Python. We will direct you to the official documentation that helps you set up your Raspberry Pi with the necessary equipment such as the monitor, keyboard, mouse, power supply, and so on. It will then dive right into the basics of Python programming. Later, it will focus on other Python tasks, for instance, interfacing with hardware, GUI programming, and more. Once you get well versed with the basic programming, the book will then teach you to develop Python/Raspberry Pi applications. By the end of this book, you will be able to develop Raspberry Pi applications with Python and will have good understanding of Python programming for Raspberry Pi.
Table of Contents (13 chapters)
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Preface
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Preface
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What this book covers
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What you need for this book
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Who this book is for
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Conventions
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Reader feedback
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Customer support
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1
1. Your First Steps with Python on the Pi
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1. Your First Steps with Python on the Pi
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Installing and setting up Raspbian
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The Python development tools
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Running some simple Python scripts
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Summary
2
2. Understanding Control Flow and Data Types
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2. Understanding Control Flow and Data Types
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Data in Python
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Control flow operators
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Using functions
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Summary
3
3. Working with Data Structures and I/O
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3. Working with Data Structures and I/O
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Data structures
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Input/output
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Summary
4
4. Understanding Object-oriented Programming and Threading
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4. Understanding Object-oriented Programming and Threading
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Object-oriented programming
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Classes in Python
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Threading
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Summary
5
5. Packaging Code with setuptools
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5. Packaging Code with setuptools
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Using packages in your Python code
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Packaging your own Python modules
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Summary
6
6. Accessing the GPIO Pins
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6. Accessing the GPIO Pins
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Digital electronics
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The GPIO library
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Universal Asynchronous Receiver/Transmitter (UART)
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Additional libraries
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Summary
7
7. Using the Camera Module
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7. Using the Camera Module
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Setting up the camera module
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Installing and testing the Python library
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Writing applications for the camera
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Summary
8
8. Extracting Data from the Internet
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8. Extracting Data from the Internet
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Using urllib2 to download data
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Parsing JSON APIs
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Parsing XML APIs
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Parsing a web page using BeautifulSoup
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Summary
9
9. Creating Command-line Interfaces
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9. Creating Command-line Interfaces
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Unit conversion application
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Command-line interface
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Summary
10
10. Debugging Applications with PDB and Log Files
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10. Debugging Applications with PDB and Log Files
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The Python debugger
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Writing log files
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Unit testing
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Summary
11
11. Designing Your GUI with Qt
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11. Designing Your GUI with Qt
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Setting up the codebase
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Building the UI with Qt Designer
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Writing the UI code
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Launching the UI
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Packaging the code
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Summary
12
Index
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Index

Writing the UI code

Once the .ui file has been created with Qt Designer, we can now write the code that will manage the functionality behind the UI. This will be in a Python file of the same name as the .ui file in the unitconverter.gui package.

As always, we will start the Python file with the imports for the modules and functions used within the file:

import os.path
from PyQt4 import uic
from PyQt4.QtGui import QApplication, QMainWindow
from PyQt4.QtCore import SIGNAL
from ..Converter import get_table

Next, we will load the .ui file in order to create an instance of the user interface it defines. This is done by replacing the extension of the full file path of the Python source file with .ui.

ui_filename = os.path.splitext(__file__)[0] + '.ui'
ui_UnitConverter = uic.loadUiType(ui_filename)[0]

We will now define a class named UnitConverter, which provides the functionality for the user interface. This class will inherit from both QMainWindow and the user interface class created when...

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