1 of 22

Tough love Grandma

2 of 22

Extraordinary People

Iceman

Blind painter

Human calculator

Human camera

Human compassSpiderman Roofballers

3 of 22

Overview

gp.Describe(object) Describe object

gp.List* Python list of objects

ArcGIS 9.3

ArcGIS 10arcpy.Describe(object)arcpy.List*

4 of 22

9.2 9.3

Evolution Describe Object Properties

An example of how Python is evolvingwith ArcGIS

5 of 22

Describing data

6 of 22

Describe Example (feature class)

… if you plan to do multiples in same workspace

7 of 22

Describe a Feature Class

8 of 22

Describe a Geodatabase

some are case sensitive, others notarcpy.env.workspace is

9 of 22

Fields in a Feature Class via Describe

ArcGIS 8.x, 9.x

ArcGIS 10

10 of 22

Describe a Raster

11 of 22

Overview

gp.Describe(object) Describe object

arcpy.List* Python list of objects

12 of 22

Lists of Objects in Geoprocessing OMD

13 of 22

Listing Data

List*: Python List (i.e. returns a Python List)

Know number of * in a Python list

Use a for loop

14 of 22

ListFields(pInputValue, [wild card], [FieldType])

Same Field object as each Field object in list thatis returned by Fields propertyof the Describe Object

15 of 22

ListFields examples

16 of 22

ListFeatureClasses([wildCard], [FeatureType])

17 of 22

ListFeatureClasses examples

18 of 22

os.walk(top, topdown, onerror)

19 of 22

os.walk() simple example

20 of 22

os.walk() not-so-simple example

Find all Flash videos (SWF) in the entire tree under a given root folderIf the SWF file has the “slide”, and not “group”, as part of its name convert the first frame of the video to a JPG with the name of the SWF

21 of 22

os.walk() not-so-simple example

22 of 22

There’s an app for that