1 of 22 Tough love Grandma

2 of 22 Extraordinary People Iceman Blind painter Human calculator Human camera Human compass Spiderman Roofballers

3 of 22 Overview gp.Describe(object)  Describe object gp.List*  Python list of objects ArcGIS 9.3 ArcGIS 10 arcpy.Describe(object) arcpy.List*

4 of Evolution Describe Object Properties An example of how Python is evolving with 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 not arcpy.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 Overvie w 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 that is returned by Fields property of 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 folder If 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