Hello everyone,
I have been searching around these forums for awhile now trying to track something down that could help me solve the problem that I am having.
Basically I have 800~ rasters that I can get an output for in the correct order in a list. I need to then take these 800 rasters and multiply each one by a value in a shapefiles attribute table under the field Sum_Count.
I was able to get a printed list of the values that I wanted by using a SearchCursor and a rows.next() function. The issue is that this was only printing out the values for me and not creating a list from these values that I can then use in a calculation.
My code is very sloppy right now as I am VERY new with python so I apologize. My boss just asked me to help him with this and I have been going off things I have found on the internet.
This script gives me the output as follows:
>> ================================ RESTART ================================
>>>
Successfully created list1
[u'E:\\Models_Ken\\PSI_Outputs\\Test_Small_Run\\PSI_Census_SourceCalculation_0_step1_minus.tif']
Successfully created list1
[u'E:\\Models_Ken\\PSI_Outputs\\Test_Small_Run\\PSI_Census_SourceCalculation_0_step1_minus.tif', u'E:\\Models_Ken\\PSI_Outputs\\Test_Small_Run\\PSI_Census_SourceCalculation_1_step1_minus.tif']
Successfully created list1
[u'E:\\Models_Ken\\PSI_Outputs\\Test_Small_Run\\PSI_Census_SourceCalculation_0_step1_minus.tif', u'E:\\Models_Ken\\PSI_Outputs\\Test_Small_Run\\PSI_Census_SourceCalculation_1_step1_minus.tif', u'E:\\Models_Ken\\PSI_Outputs\\Test_Small_Run\\PSI_Census_SourceCalculation_2_step1_minus.tif']
Successfully created list1
[u'E:\\Models_Ken\\PSI_Outputs\\Test_Small_Run\\PSI_Census_SourceCalculation_0_step1_minus.tif', u'E:\\Models_Ken\\PSI_Outputs\\Test_Small_Run\\PSI_Census_SourceCalculation_1_step1_minus.tif', u'E:\\Models_Ken\\PSI_Outputs\\Test_Small_Run\\PSI_Census_SourceCalculation_2_step1_minus.tif', u'E:\\Models_Ken\\PSI_Outputs\\Test_Small_Run\\PSI_Census_SourceCalculation_3_step1_minus.tif']
Successfully created list1
[u'E:\\Models_Ken\\PSI_Outputs\\Test_Small_Run\\PSI_Census_SourceCalculation_0_step1_minus.tif', u'E:\\Models_Ken\\PSI_Outputs\\Test_Small_Run\\PSI_Census_SourceCalculation_1_step1_minus.tif', u'E:\\Models_Ken\\PSI_Outputs\\Test_Small_Run\\PSI_Census_SourceCalculation_2_step1_minus.tif', u'E:\\Models_Ken\\PSI_Outputs\\Test_Small_Run\\PSI_Census_SourceCalculation_3_step1_minus.tif', u'E:\\Models_Ken\\PSI_Outputs\\Test_Small_Run\\PSI_Census_SourceCalculation_4_step1_minus.tif']
Successfully created list1
[u'E:\\Models_Ken\\PSI_Outputs\\Test_Small_Run\\PSI_Census_SourceCalculation_0_step1_minus.tif', u'E:\\Models_Ken\\PSI_Outputs\\Test_Small_Run\\PSI_Census_SourceCalculation_1_step1_minus.tif', u'E:\\Models_Ken\\PSI_Outputs\\Test_Small_Run\\PSI_Census_SourceCalculation_2_step1_minus.tif', u'E:\\Models_Ken\\PSI_Outputs\\Test_Small_Run\\PSI_Census_SourceCalculation_3_step1_minus.tif', u'E:\\Models_Ken\\PSI_Outputs\\Test_Small_Run\\PSI_Census_SourceCalculation_4_step1_minus.tif', u'E:\\Models_Ken\\PSI_Outputs\\Test_Small_Run\\PSI_Census_SourceCalculation_5_step1_minus.tif']
0
6
164
122
9
0
Traceback (most recent call last):
File "E:\Models_Ken\PSI_Outputs\Scripts\PSI_Multiply.py", line 41, in <module>
inParcelNumber = row.Sum_Count
AttributeError: 'NoneType' object has no attribute 'Sum_Count'
--------------------------------------------------------------------------------------------------------------------------------------------------------
As you can see, my list 1 is populated with the rasters I specified. The last set of numbers being 0,6,164,122,9,0 are the values that I am pulling out of the shapefiles Sum_Count field. These would be the values that I am looking to do my multiplication by, but instead of these values being stored in a list I am only able to print them out in this fashion.
Sorry if this is confusing what I am trying to do by how I am describing it here, if anyone has any thoughts or questions about what I am trying to do I would really appreciate the feedback.
Thanks,
Zach Ancona
I have been searching around these forums for awhile now trying to track something down that could help me solve the problem that I am having.
Basically I have 800~ rasters that I can get an output for in the correct order in a list. I need to then take these 800 rasters and multiply each one by a value in a shapefiles attribute table under the field Sum_Count.
I was able to get a printed list of the values that I wanted by using a SearchCursor and a rows.next() function. The issue is that this was only printing out the values for me and not creating a list from these values that I can then use in a calculation.
My code is very sloppy right now as I am VERY new with python so I apologize. My boss just asked me to help him with this and I have been going off things I have found on the internet.
Code:
import arcpy, os
from arcpy import env
from arcpy.sa import *
arcpy.CheckOutExtension("Spatial")
env.workspace = r"E:\Models_Ken\PSI_Outputs\Test_Small_Run"
list1 = []
lstRasters = arcpy.ListRasters("*")
for raster in lstRasters:
list1.append(env.workspace + os.sep + raster)
print 'Successfully created list1'
print list1
#env.workspace = r"E:\Models_Ken\PSI_Outputs\Test_Small_Run"
featureClass = r"E:\Models_Ken\PSI_Outputs\Test_Small_Run\Tract_Centroids_Test.shp"
list2 = []
#fclist = arcpy.ListFeatureClasses("*","Point")
#for fc in fclist:
#list2.append(env.workspace + os.sep + raster)
#print 'Successfully created list2'
rows = arcpy.SearchCursor(featureClass)
row = rows.next()
while row:
print row.Sum_Count
row = rows.next()
count = len(list1)
x = 0
while x < count:
raster = list1[x]
name = raster.split("\\")[-1]
inParcelNumber = row.Sum_Count
outTimes = raster * inParcelNumber
outTimes.save(r"E:\Models_Ken\PSI_Outputs\Test_Small_Run_Output" + os.sep + name.split(".")[0] + "_minus.tif")
print 'Successfully created raster'
x += 1
del list1, row.Sum_Count>> ================================ RESTART ================================
>>>
Successfully created list1
[u'E:\\Models_Ken\\PSI_Outputs\\Test_Small_Run\\PSI_Census_SourceCalculation_0_step1_minus.tif']
Successfully created list1
[u'E:\\Models_Ken\\PSI_Outputs\\Test_Small_Run\\PSI_Census_SourceCalculation_0_step1_minus.tif', u'E:\\Models_Ken\\PSI_Outputs\\Test_Small_Run\\PSI_Census_SourceCalculation_1_step1_minus.tif']
Successfully created list1
[u'E:\\Models_Ken\\PSI_Outputs\\Test_Small_Run\\PSI_Census_SourceCalculation_0_step1_minus.tif', u'E:\\Models_Ken\\PSI_Outputs\\Test_Small_Run\\PSI_Census_SourceCalculation_1_step1_minus.tif', u'E:\\Models_Ken\\PSI_Outputs\\Test_Small_Run\\PSI_Census_SourceCalculation_2_step1_minus.tif']
Successfully created list1
[u'E:\\Models_Ken\\PSI_Outputs\\Test_Small_Run\\PSI_Census_SourceCalculation_0_step1_minus.tif', u'E:\\Models_Ken\\PSI_Outputs\\Test_Small_Run\\PSI_Census_SourceCalculation_1_step1_minus.tif', u'E:\\Models_Ken\\PSI_Outputs\\Test_Small_Run\\PSI_Census_SourceCalculation_2_step1_minus.tif', u'E:\\Models_Ken\\PSI_Outputs\\Test_Small_Run\\PSI_Census_SourceCalculation_3_step1_minus.tif']
Successfully created list1
[u'E:\\Models_Ken\\PSI_Outputs\\Test_Small_Run\\PSI_Census_SourceCalculation_0_step1_minus.tif', u'E:\\Models_Ken\\PSI_Outputs\\Test_Small_Run\\PSI_Census_SourceCalculation_1_step1_minus.tif', u'E:\\Models_Ken\\PSI_Outputs\\Test_Small_Run\\PSI_Census_SourceCalculation_2_step1_minus.tif', u'E:\\Models_Ken\\PSI_Outputs\\Test_Small_Run\\PSI_Census_SourceCalculation_3_step1_minus.tif', u'E:\\Models_Ken\\PSI_Outputs\\Test_Small_Run\\PSI_Census_SourceCalculation_4_step1_minus.tif']
Successfully created list1
[u'E:\\Models_Ken\\PSI_Outputs\\Test_Small_Run\\PSI_Census_SourceCalculation_0_step1_minus.tif', u'E:\\Models_Ken\\PSI_Outputs\\Test_Small_Run\\PSI_Census_SourceCalculation_1_step1_minus.tif', u'E:\\Models_Ken\\PSI_Outputs\\Test_Small_Run\\PSI_Census_SourceCalculation_2_step1_minus.tif', u'E:\\Models_Ken\\PSI_Outputs\\Test_Small_Run\\PSI_Census_SourceCalculation_3_step1_minus.tif', u'E:\\Models_Ken\\PSI_Outputs\\Test_Small_Run\\PSI_Census_SourceCalculation_4_step1_minus.tif', u'E:\\Models_Ken\\PSI_Outputs\\Test_Small_Run\\PSI_Census_SourceCalculation_5_step1_minus.tif']
0
6
164
122
9
0
Traceback (most recent call last):
File "E:\Models_Ken\PSI_Outputs\Scripts\PSI_Multiply.py", line 41, in <module>
inParcelNumber = row.Sum_Count
AttributeError: 'NoneType' object has no attribute 'Sum_Count'
--------------------------------------------------------------------------------------------------------------------------------------------------------
As you can see, my list 1 is populated with the rasters I specified. The last set of numbers being 0,6,164,122,9,0 are the values that I am pulling out of the shapefiles Sum_Count field. These would be the values that I am looking to do my multiplication by, but instead of these values being stored in a list I am only able to print them out in this fashion.
Sorry if this is confusing what I am trying to do by how I am describing it here, if anyone has any thoughts or questions about what I am trying to do I would really appreciate the feedback.
Thanks,
Zach Ancona