Printing Raster extents but not showing on console

Question

print("Data {0}, xmin{1}, ymin{2}, xmax{3}, ymax{4}".format(ext.Xmin, ext.Xmax, ext.Ymin, ext.Ymax))

The line of code above is not printing out the extent for each raster in my dataset in the code below. It runs without an error, but nothing is displayed.

myRasterList = []
for RAWR in myRasterList:
    ext = arcpy.Describe(RAWR).Extent
    print(ext.Xmin)
    print ("Data extents {4}, Xmin{0}, Xmax{1}, Ymin{2}, Ymax{3}".format(ext.XMin, ext.XMax, ext.YMin, ext.YMax, RAWR))

import arcpy, sys, os
env = arcpy.env
from arcpy import management as DM
from arcpy.sa import *
from arcpy import analysis as AN
from arcpy import conversion as CV

env.workspace = r"F:/Fall 2019/GEOG 625/Exam Data/ExamData/MichaelBreidert/Pen/HMB.gdb"

scriptdir = os.path.dirname(sys.argv[0])
#ws = arcpy.env.workspace = r"F:\Fall 2019\GEOG 625\Exam Data\ExamData\MichaelBreidert"
# creating variable to hold GDB
hmb = scriptdir + "/HMB.gdb"

myRasterList = []
for RAWR in myRasterList:
    ext = arcpy.Describe(RAWR).Extent
    print("Data {0}, xmin{1}, ymin{2}, xmax{3}, ymax{4}".format(ext.Xmin, ext.Xmax, ext.Ymin, ext.Ymax))

How do I print the extents of all data in my HMB.gdb?

Answer 1

Nothing prints because your code never gets to the print() function. Right before the for loop, you explicitly set myRasterList = [] i.e. an empty list, so there's nothing to loop through.

You need to fill myRasterList using the arcpy.ListRasters() function.

You also need to be careful with your (lower and upper) case.

For example (slightly abbreviated from your code above):

import arcpy, sys, os
env = arcpy.env

env.workspace = r"F:/Fall 2019/GEOG 625/Exam Data/ExamData/MichaelBreidert/Pen/HMB.gdb"

myRasterList = arcpy.ListRasters()  # list every raster in env.workspace, 
                                    # i.e. r"F:/Fall 2019/GEOG 625/Exam Data/ExamData/MichaelBreidert/Pen/HMB.gdb"
for RAWR in myRasterList:
    ext = arcpy.Describe(RAWR).extent  # note lower case "extent"
    # note case of "XMin" (not "Xmin") etc.
    print("Data {0}, xmin{1}, ymin{2}, xmax{3}, ymax{4}".format(ext.XMin, ext.XMax, ext.YMin, ext.YMax))