1. Intro to Python Welcome to the Wonderful world of GIS programing!

2. Topics A brief history of GIS programing What is Python? What is PythonWin? Basics of Python

3. Brief history of ESRI’s GIS software evolution Arc/Info Coverage 1980’s Software Data Format Year ArcView Shapefile 1990’s ArcGIS 8 & 9 Geodatabase 2000’s ArcGIS 10 Geodatabase 2010

4. Programming language SML was used for PC ArcInfo AML was used for Arc/INFO 7.x Avenue was used for ArcView 3.x Visual Basic for Application (VBA) is for ArcGIS 8 & 9 & packaged with it Python for ArcGIS10

5. What is Python? An object oriented scripting language Cross-platform: meaning portable & will run on Windows, Unix, and Linux Python is fully embraced by ESRI at ArcGIS 10 Comes bundled with ArcGIS Free

6. Programming Environments Python files are text files (.py extension) Python code can be written in Text Editor IDLE Python Win Python Window PythonWin is the preferred way!

7. PythonWin Interface 1.PyhonWin created specifically for windows with common tools & menus 2.Windows look and feel 3.3 windows: a. Application window b. Script window c. Interactive window

8. PythonWin: Script Window Script window is for writing, saving, & executing code Python scripts are saved with.py extension. Ex: (Test.py)

9. PythonWin: Interactive Window Interactive window is for testing code and report errors messages Also report the output of print statement

10. PythonWin: Application/main window Run ScriptCheck Script Script ran successfully

11. Basic Python syntax Comments Variables Strings Numbers

12. Comments Lines of code that serve as documentation: Non-executable Use a # or ## It’s a must for your lab Block of code can be commented -- Highlight the block of code in the script window -- Right click>Source Code>Comment out region Example: # Name: John Denver # Date: January 2012

13. Python Statements Lines of code that perform a task print- sends output to the interactive window import – import a module Example: print “Welcome to Python world” import math (import math module)

14. Variables Variables store values of different types first = ”Bob” last = “Brown” age = 30 height = 5.6 source = “C:/Exercises/Auburn.gdb” Variables are case sensitive Num = 500 & num = 5000 (2 variables) Variables are dynamically type -- do not have to declare the variable -- don’t have to assign a data type

15. Strings An ordered collection of characters Can be surrounded by double (“”) or single (‘’) quotes message = “Welcome to Python” input = “C:/GIS222/Auburn.gdb/roads”

16. Manipulating Strings Strings can be concatenated f1 = “C:/GIS222/Auburn/roads” f2 = “.shp” Data = f1 + f2 Result= “C:/GIS222/Auburn/roads.shp” Strings can be repeated s1 = “Ha!” s1*3 Result= “Ha!Ha!Ha!”

17. Common String Functions Upper, lower, capitalize,……….. f1 = “AUBURN.shp” f1.upper() Result: “AUBURN.SHP” There are many more; find them by typing object. f1.lower() Result: “auburn.shp” f1.capitalize() Result: “Auburn.shp f1.replace(“AUBURN”, “OWASCO”) Result: “OWASCO.shp”

18. Built-in Python Functions 2. round() returns a rounded number xCoord = 450,000.2345 round(xCoord) Result: 450,000 1. len() returns the length of a string or a list f1 = “AUBURN.shp” len(f1) Result: 10 3.str() converts an integer to a string zone = 18 strzone = str(zone) print “UTM Zone” + strzone

19. Other Functions to convert values 2. int() returns an integer value int(“10”) Result: 10 1. float() returns a floating point value float(“10.0”) Result: 10.0 3.str() converts an integer to a string str(18) Result: “18” print “UTM Zone” + str(18)

20. Getting user input 2. str = raw_input(“Enter your name: “) 1.num = input(“Enter you age: “) You can always check your input with print num Or print str

21. Python Tutorial Search: “What is Python” ArcGIS Resources Center:

22. Let’s try it!