Checks to see if a license is available to be checked out for a specific type of extension.
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 to the License Manager so other applications can use it. All checked-out extension licenses and set product licenses are returned to the License Manager when a script completes.
Keyword for the extension product that is being checked.
There are four possible returned values for CheckExtension:
Check for availability of 3D Analyst extension before checking it out.
class LicenseError(Exception): pass import arcview import arcpy from arcpy import env try: if arcpy.CheckExtension("3D") == "Available": arcpy.CheckOutExtension("3D") else: # raise a custom exception # raise LicenseError env.workspace = "D:/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: print arcpy.GetMessages(2)