How can I use arcpy.Dissolve_management inside PythonCaller?

Hi iwem,

Unfortunately, this isn't going to work. The FME "feature" object isn't compatible with the feature class reference that Dissolve_management() expects.

In short, you'll have to write all your FME features to a separate feature class and then run Dissolve_management() on that feature class after all the features have been written. The easiest may be to use a FeatureWriter followed by a PythonCaller.

Jeroen is right about test_output being undefined, but that isn't the main problem.

Hi there!  To use Python and ArcPy within FME you should use the fmeobject Library :

import fmeobjects

import arcpy

It allow you to use attribute and any value on the feature you are using.

feature.getAttribute('your attribute name here')

feature.setAttribute("New attribute name here", value from python here)

Once you get the wright syntax in python code, FME will execute the code perfectly...

I use a lot of python, arcpy and FME together and It's very usefull!

Thanks a lot for your answers!

I tried to insert a FeatureWriter.

Now my workbench looks like:

In the feature writer I took the input-data and wrote all the Features to a local ESRI File Geodatabase.

Then I changed my python script to:

Now I get the following Error Message:

Python Exception <RuntimeError>: Object: Error in executing tool

What's wrong?

As mentioned, you cannot pass the "feature" object to Dissolve_management, it expects a string with the fully qualified name of the feature class

test_output = 'c:/temp/temp.gdb/test_output'
test_input = 'c:/temp/temp.gdb/test_input_iwem'
arcpy.Dissolve_management(test_input, test_output, 'Gemeindename', '', 'SINGLEPART')

As you can see, the first parameter to Dissolve_management is a string, not an instance of fmeobjects.FMEFeature.

You should probably also delete the last line of your python script, "pyoutput(test_output)"

test_output = 'c:/temp/temp.gdb/test_output'
test_input = 'c:/temp/temp.gdb/test_input_iwem'
arcpy.Dissolve_management(test_input, test_output, 'Gemeindename', '', 'SINGLEPART')

Thanks a lot for your anwer david_r!

Now it works! :)