By Laura Tateosian

This e-book introduces Python scripting for geographic details technological know-how (GIS) workflow optimization utilizing ArcGIS. It builds crucial programming abilities for automating GIS research. Over 2 hundred pattern Python scripts and a hundred seventy five classroom-tested workouts strengthen the educational targets. Readers will discover ways to: • Write and run Python within the ArcGIS Python Window, the PythonWin IDE, and the PyScripter IDE • paintings with Python syntax and knowledge forms • name ArcToolbox instruments, batch procedure GIS datasets, and control map records utilizing the arcpy package deal • learn and alter proprietary and ASCII textual content GIS information • Parse HTML web content and KML datasets • Create web content and fetch GIS facts from net resources. • construct user-interfaces with the local Python dossier conversation toolkit or the ArcGIS Script instruments and PyToolboxes Python for ArcGIS is designed as a major textbook for advanced-level scholars in GIS. Researchers, govt experts and execs operating in GIS also will locate this ebook invaluable as a reference.

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3 Slice Strings Indexing can be thought of as getting a substring which is only one character long. To get more than one character, use slicing instead of indexing. Slicing gets a substring (a slice) of a string. Slicing uses square brackets with a colon inside. A number on either side of the colon indicates the starting and ending index of the desired slice. The left number is inclusive, the right is exclusive. >>> fieldName = 'COVER' >>> fieldName[1:3] 'OV' The letter O is the index 1 character in the string 'COVER' and the letter E is the index 3 character, so the slice starts at the letter O and ends just before the letter E.

4. Customize menu > ArcCatalog Options > File Types tab > New Type Enter Python for Description and py for File extension Import File Type From Registry… Click ‘OK’ to complete the process. It may be necessary to restart ArcCatalog in order to view the python files. 2 How to Run Code in PythonWin and PyScripter 19 II. By default, Windows® operating system users can see Python scripts in Windows Explorer, but the file extension may be hidden. py’ extension on Python files, change the settings under the Windows Explorer tools menu.

Python statements in the window labeled ‘Interactive Window’ are executed as soon as you 16 2 Beginning Python finish typing the line of code and press the ‘Enter’ key. The >>> symbol in the Interactive Window is the Python prompt. Just like the prompt in the ArcGIS Python Window, it indicates that Python is waiting for input. Type something at the Python prompt and press the ‘Enter’ key. On the following line, Python displays the result. Enter print "GIS rules" and it displays ‘GIS rules’. Enter 1 + 1 and Python displays 2.

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