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I am trying change the value of a row for a field whose type is "short" in arcmap using a python script.

with arcpy.da.UpdateCursor(FILENAME, FIELD) as cursor:

    for row in cursor:
        row = 'Center'

with this i receive the error "RuntimeError: The value type is incompatible with the field type."

I know I am giving a string type to a "short" type field. Is there a way around this? There are pre-set values in this field. Do I need to run some other kind of code to create a list of possible values for this field, then select the value based on some kind of list interaction eg row = fieldlist[1]

Please ask me to clarify anything, but this is everything that seems relevant to me at this point.

share|improve this question
You can't change the row object directly. You need to change the field on the row. Short is a number not a string. – Nathan W Aug 6 '13 at 1:44
What do you mean by pre-set values in this field? – Nathan W Aug 6 '13 at 1:48
So if i do this manually in arcmap, when i edit this fc, the field has a dropdown menu of values i can choose. – TheLastGIS Aug 6 '13 at 1:49
Sure. So your goal is to get the number value for 'Center'? Correct? – Nathan W Aug 6 '13 at 1:51
What are your variables FILENAME and FIELD set to? Please edit your question to include that critical information. Try to make clear what your data and field types are. – PolyGeo Aug 6 '13 at 2:05
up vote 5 down vote accepted

Sounds like you have a coded value attribute domain for that field.

Something like the following might give you some ideas.

import arcpy

fieldname='test' #This is a short integer field with a coded value attribute domain
arcpy.env.workspace = fgdb

#Get a reference to the Field object so we can    
#find out what attribute domain it uses

#Find out what the coded values are and make a look up dict for them.
domains = arcpy.da.ListDomains(fgdb)
for domain in domains:
    if == field.domain:
        #assume domain.domainType == 'CodedValue'
        coded_values = domain.codedValues
        #Reverse the coded_values key/values so we can query by the coded value description

#Set field
with arcpy.da.UpdateCursor(featclass, fieldname) as cursor:
    for row in cursor:
        row[0] = lookup_values['Centre']
share|improve this answer
Thanks Luke this looks really helpful. I've been looking through the ESRI docs to find these types of functions to build a solution like this. – TheLastGIS Aug 6 '13 at 3:15
@JackHansen - to find out if you actually do have a coded value domain, rightclick on the featureclass in ArcCatalog (or the layer in ArcMap TOC), select properties->fields tab and click on the field to see its properties. If it has a domain, you should see something like domain (or coded value domain) some_domain_name in the field properties. – Luke Aug 6 '13 at 3:21
It reads under 'Field details' > 'Coded value domain' > 'VerticalAlignment'. 'VerticalAlignment' being the field I am interested in. So I can make the assumption that this is a coded value domain. – TheLastGIS Aug 6 '13 at 3:25

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