GetApplication() checks for Pro or Desktop as a Python snippet

GetApplication.py

def GetApplication():
    '''Return app environment as ARCMAP, ARCGIS_PRO, OTHER'''
    try:
        from arcpy import mp
        return "ARCGIS_PRO"
    except ImportError:
        try:
            from arcpy import mapping
            mxd = arcpy.mapping.MapDocument("CURRENT")
            return "ARCMAP"
        except:
            return "OTHER"