CheckOutExtension

Summary

Retrieves the license from the License Manager.

License:

CheckOutExtension is only needed when using a Concurrent Use license; for all other cases, it has no effect. When using a Concurrent Use license, once the extension license has been retrieved by the script, tools using that extension can be used. Once a script is finished with an extension's tools, the CheckInExtension function should be used to return the license so other applications can use it. All checked-out extension licenses and set product licenses are returned when a script completes.

Syntax

CheckOutExtension (extension_code)

Parameter	Explanation	Data Type
extension_code	Specifies the extension product to be 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 Learn more about accessing licenses and extensions in Python	String

Return Value

Data Type	Explanation
String	The function returns a string indicating the success or failure of the checkout. NotInitialized—No desktop license has been set. Unavailable—The requested license is unavailable to be set. CheckedOut—The license has been set successfully.

Code sample

CheckOutExtension example

Checks out the ArcGIS 3D Analyst extension for use by tools.

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))