topic Re: NoneType object is not iterable in Python Questions

NoneType object is not iterable

JeremiahGbolagun1 — Tue, 18 Sep 2018 22:51:27 GMT

Hi there, when I run this code in PyScripter IDE I received this error 'NoneType is not iterable'.

Can you please help to address this problem.

Regards,

import arcpy

#Set geoprocessing environments
arcpy.env.workspace = ("C:\EsriTraining\Python10_0\Data\SanJuan.gdb")
arcpy.env.overwriteOutput = True
#Create list of feature classes in SanJuan.gdb
fcList = arcpy.ListFeatureClasses()
#Create a loop to buffer Lakes and Streams
bufferList = []
for fc in fcList:
if fc == "Lakes" or fc == "Streams":
arcpy.Buffer()
arcpy.Buffer_analysis(fc, fc + "Buffer", "1000 meters")
bufferList.append(fc + "Buffer")
arcpy.Union_analysis(bufferList, "WaterBuffers")

Re: NoneType object is not iterable

DarrenWiens2 — Tue, 18 Sep 2018 22:57:22 GMT

Please format your code for readability: /blogs/dan_patterson/2016/08/14/script-formatting

I assume your code is failing at:

for fc in fcList:‍‍‍

Try printing fcList to see if it's empty. I suspect it's because your path isn't a raw string (backslashes in paths are bad). Try:

arcpy.env.workspace = r"C:\EsriTraining\Python10_0\Data\SanJuan.gdb"‍‍‍

If none of this helps, please format your code and indicate where the error occurs.

edit: this line is surely wrong:

arcpy.Buffer()‍

Re: NoneType object is not iterable

JeremiahGbolagun1 — Tue, 18 Sep 2018 23:08:58 GMT

I added r and yet the same error occurred.

Re: NoneType object is not iterable

DanPatterson_Retired — Tue, 18 Sep 2018 23:17:22 GMT

adding the r is a start, but you didn't see Darren's statement

arcpy.Buffer()

that line will fail. In fact, in its current state you code will fail because it is not formatted properly.

Now the error message indicates that there are no featureclasses in your featureclass list

ListFeatureClasses—ArcPy Functions | ArcGIS Desktop

or it failed because of the arcpy.Buffer() line,

Re: NoneType object is not iterable

JeremiahGbolagun1 — Tue, 18 Sep 2018 23:32:22 GMT

This code was written in one of your online courses called “Python Scripting for Geoprocessing Workflows” Can you please help to rewrite the code.

Re: NoneType object is not iterable

JeremiahGbolagun1 — Tue, 18 Sep 2018 23:38:22 GMT

When I removed the ‘arcpy.Buffer() the code failed at “for fc in fcList:

Re: NoneType object is not iterable

DanPatterson_Retired — Tue, 18 Sep 2018 23:40:47 GMT

put a print statement before that line and see if there is anything there to cycle through

print("found.... {}".format(fcList))

Re: NoneType object is not iterable

JeremiahGbolagun1 — Tue, 18 Sep 2018 23:50:58 GMT

This is the outcome Dan.

Re: NoneType object is not iterable

DanPatterson_Retired — Tue, 18 Sep 2018 23:57:33 GMT

so the print statement? did you put it in?

Re: NoneType object is not iterable

JeremiahGbolagun1 — Wed, 19 Sep 2018 00:01:46 GMT

Yes I did. Did you see the print screen image I sent to you Dan.

Re: NoneType object is not iterable

DanPatterson_Retired — Wed, 19 Sep 2018 00:04:50 GMT

found it.

try just one line

import arcpy

does it error out? It never makes it to the print statement which suggests something else

Re: NoneType object is not iterable

DarrenWiens2 — Wed, 19 Sep 2018 01:50:57 GMT

What's in the previous 9 lines?

Re: NoneType object is not iterable

DanielJones6 — Fri, 15 Feb 2019 22:51:05 GMT

from arcpy import env ?