CheckExtension

Summary

Checks to see if a license is available to be checked out for a specific type of extension.

Syntax

CheckExtension (extension_code)

Parameter	Explanation	Data Type
extension_code	Keyword for the extension product that is being checked. 3D—ArcGIS 3D Analyst extension Aeronautical—ArcGIS Aviation Charting Airports—ArcGIS Aviation Airports ArcScan—ArcScan Bathymetry—ArcGIS Bathymetry DataReviewer—ArcGIS Data Reviewer DataInteroperability—ArcGIS Data Interoperability extension for Desktop Defense—ArcGIS Defense Mapping Foundation—ArcGIS Production Mapping GeoStats—ArcGIS Geostatistical Analyst extension JTX—ArcGIS Workflow Manager (Classic) Desktop LocationReferencing Nautical—ArcGIS Maritime Network—ArcGIS Network Analyst extension Publisher—ArcGIS Publisher Schematics—ArcGIS Schematics extension SMPAsiaPacific—StreetMap Premium Asia Pacific SMPEurope—StreetMap Premium Europe SMPJapan—StreetMap Premium Japan SMPLatinAmerica—StreetMap Premium Latin America SMPMiddleEastAfrica—StreetMap Premium Middle East Africa SMPNorthAmerica—StreetMap Premium North America Spatial—ArcGIS Spatial Analyst extension Tracking—ArcGIS Tracking Analyst extension	String

Return Value

Data Type	Explanation
String	There are four possible returned values for CheckExtension: Available—The requested license is available to be set. Unavailable—The requested license is unavailable to be set. NotLicensed—The requested license is not valid. Failed—A system failure occurred during request.

Code sample

CheckExtension example

Check for availability of ArcGIS 3D Analyst extension before checking it out.

import arcpy

class LicenseError(Exception):
    pass

try:
    if arcpy.CheckExtension("3D") == "Available":
        arcpy.CheckOutExtension("3D")
    else:
        # raise a custom exception
        raise LicenseError

    arcpy.env.workspace = "c:/GrosMorne"
    arcpy.HillShade_3d("WesternBrook", "wbrook_hill", 300)
    arcpy.Aspect_3d("WesternBrook", "wbrook_aspect")
    arcpy.CheckInExtension("3D")

except LicenseError:
    print("3D Analyst license is unavailable")
except arcpy.ExecuteError:
    print(arcpy.GetMessages(2))