Intro to Python

Intro to Python

• 1.
  Introduction to PythonIntroductionto 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 ItLook Like?What Does It Look Like?
• 5.
  Parts of aPython 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 proclamationsGoodprogramming 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 moduleis 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 programmingexpression is a combination of symbols to represent a value. • One side of an equation • Ex. • 5+7 • False • print() • led.on()
• 9.
  Printing a Lineof 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 Thetime 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 isan 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