Intro to Python
- 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: s ◦ Setup pins as inputs or outputs ◦ Read inputs ◦ Set output levels However, gpiozero is a wrapper library that is built on top of RPi.GPIO to provide a simpler interface to manipulate the pins. Code: ◦ Importing gpiozero module import gpiozero ◦ Using led functions and objects LED(pin#).on() LED(pin#).off() LED(pin#).blink()
- 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