This document provides an introduction to Python programming. It discusses why Python is a useful language, how Python code is interpreted, the basic parts of a Python program including modules and main code, using comments and whitespace for readability, importing common modules like time and GPIOZero for working with times and LEDs, and basic expressions. Key terms defined include objects, modules, functions, and manipulating GPIO pins to control LEDs.

1. Introduction to PythonIntroduction to Python
ProgrammingProgramming

2. Why Python?Why Python?
 Python is what is referred to as an object-oriented programming
language (OOP)
 Python is a general purpose programming language. That means you
can use Python to write code for a number of programming tasks.
◦ Google search engine
◦ Gaming
◦ Processing financial
transactions
◦ Data Analytics
◦ Physical Programming
 Simple
 Less Syntax
 Extensive User Community
 Interpreted

3. Interpreted?Interpreted?
Python is interpreted, which means that
python code is translated and executed by
an interpreter one statement at a time.
This means you can run commands/code
on the command prompt…
Through a command
prompt with a text file…
Using an IDE

4. What Does It Look Like?What Does It Look Like?

5. Parts of a Python ProgramParts of a Python Program
Def: Source Code is the program text
entered into an interpreter by the
programmer.
◦ The saved file is referred to as, the source file.
◦ The main file in a python program, called main
◦ Can program on the command prompt
The extension to a python source file is “.py”
◦ Xcel - .xls
◦ Power Point - .ppt
Two main parts to a source file
◦ Modules
◦ Main code

6. Good Programming ProclamationsGood Programming Proclamations
Using comments to denote programs or
sections of code
◦ A comment beginning with # is called a single-line comment
because it terminates at the end of the current line.
◦ You also may use a multi-line comment—possibly containing
many lines—begins with ’’’ and ends with ’’’.
You use blank lines, space characters and tab characters
(i.e., “tabs”) to make programs easier to read.
◦ Together, these characters are known as white space.
◦ White-space characters are USUALLY ignored by the interpreter.
◦ Python has its own rules with white space

7. ModulesModules
 A module is a python source file that has prewritten
python code.
 These predefined files allow users to utilize code that has
been previously developed.
◦ Don’t have to recreate the wheel, just use the wheel and
improve on the technology.
 math
 time
 gpiozero
 os
 Code: Importing modules
 import module_name
 from module_name import class_name

8. ExpressionsExpressions
• A programming expression is a
combination of symbols to represent a
value.
• One side of an equation
• Ex.
• 5+7
• False
• print()
• led.on()

9. Printing a Line of TextPrinting a Line of Text
print(“ “)
Anything placed inside the quotes will be printed on the screen
upon execution of the print command.

10. Manipulating TimeManipulating Time
The time module is a popular module which
provides functions for working with times and
converting between them.
◦ sleep
◦ local time
◦ epoch time
Code:
◦ Importing time module
 import time
◦ Using time functions
 time.sleep(#)
 time.localtime(time.time())

11. Manipulating LED’sManipulating LED’s
 The Raspberry Pi comes with a library RPi.GPIO that allow
the manipulation of GPIO pins:
◦ Setup pins as inputs or outputs
◦ Read inputs, Set output levels
◦ Cleanup
 Code:
◦ Importing gpio module
 import RPi.GPIO as GPIO
 GPIO.setmode(GPIO.BCM)
◦ Setup an LED
 GPIO.setup(pin#, GPIO.OUT)
◦ Using led functions
 GPIO.output(pin#,GPIO.HIGH)
 GPIO.output(pin#,GPIO.LOW)

12. CheckpointCheckpoint
1. What is an IDE?
2. What is a comment and its importance?
3. How is white space used in
programming?
4. What are modules?
5. Name 2 modules