Output raster from IDW interpolation tool is from 3.40282e+038 to -3.40282e+038 in ArcPy

I am not familiar with Python in ArcGIS, so I used ModelBuilder first to set the environment and put the tool in. The model worked right and the output raster seemed good.

Then I exported the model to a Python script. The raster output is generated, but the value of raster is from from 3.40282e+038 to -3.40282e+038. Why did this happen and how can I fix it?

My script is like this:

# Import arcpy module
import arcpy

# Check out any necessary licenses
arcpy.CheckOutExtension("3D")

# Set Geoprocessing environments
arcpy.env.scratchWorkspace = "C:\Documents\ArcGIS\biomass.gdb"
arcpy.env.outputCoordinateSystem = "PROJCS['WGS_1984_Plate_Carree',GEOGCS['GCS_WGS_1984',DATUM['D_WGS_1984',SPHEROID['WGS_1984',6378137.0,298.257223563]],PRIMEM['Greenwich',0.0],UNIT['Degree',0.0174532925199433]],PROJECTION['Plate_Carree'],PARAMETER['False_Easting',0.0],PARAMETER['False_Northing',0.0],PARAMETER['Central_Meridian',0.0],UNIT['Meter',1.0]]"

arcpy.env.extent = "60.8785969898536 -11.0048500049116 148.898540012983 53.560734"
arcpy.env.cellSize = "MAXOF"
arcpy.env.workspace = "C:\Desktop\shape"
arcpy.env.mask = "newasia.shp"
# Local variables:
xyz_shp = "xyz.shp"
b1_ald22222 = "C:\Documents\ArcGIS\mass.gdb\b1_ald22222"
# Process: IDW
arcpy.Idw_3d(xyz_shp, "ALDX", b1_ald22222, "27000", "2", "VARIABLE 8", "")