I have a Python script which I want to execute using Python Add-In button class. Right now, I am using following:

class child(object):
    """Implementation for Toolbar_addin.button2 (Button)"""
    def __init__(self):
        self.enabled = True
        self.checked = False
    def onClick(self):

but it returns nothing when I click Python Add-In button as part of sub-menu. Is it the right way to fire child scripts using button class?

Note: child script works perfectly as a stand alone script

  • 2
    Why not import the python module and just call methods on it?
    – Nathan W
    Commented May 20, 2013 at 10:46
  • If I understand your suggestion correctly: I imported modules and generated few outputs using python Add-In. This final step will use outputs from previous steps and do some random calculations. So it has to be fired from a button.
    – Ibe
    Commented May 20, 2013 at 10:53
  • Just put child.py somewhere you Add-in can see it. In the same folder should work and just do import child and then you can call any of the methods.
    – Nathan W
    Commented May 20, 2013 at 10:58
  • child is in the same folder as Add-In logic script. Importing it gives an error (no such module exists -- since it is not a library). I tried following but no avail: subprocess.call(['C:/Python27/ArcGIS10.1/python.exe','C:/temp/child.py'])
    – Ibe
    Commented May 20, 2013 at 11:09
  • 1
    You can always import any Python file, Python just needs to see where it is. Try sys.path.append("C:\\Temp") then import child
    – Nathan W
    Commented May 20, 2013 at 11:12

3 Answers 3


@NathanW's suggestion works for me and is what I would suggest doing as well.

I have in the Install folder within my Python Add-in directory:

  • child.py:

    import os, datetime
    def writeDummyFile(path):
        with open(path, "w") as f:
    if __name__ == "__main__":
        with open(r"C:\temp\test.txt", "r") as f:
            print f.readline()

    (when run standalone prints the current time as read from the just-written file)

  • TestChildScriptAddin.py:

    import arcpy
    import pythonaddins
    import sys
    import os
    import child
    class LaunchChildScriptButton(object):
        """Implementation for LaunchChildScript.button (Button)"""
        def __init__(self):
            self.enabled = True
            self.checked = False
        def onClick(self):

    (when clicked, the current time is written to the file)

This works fine for me at 10.1 SP1. Have you tried doing something similar (barebones test)?

  • I have tried similar text writing under button and within child script as well before posting question -- works in both cases. It seems that the problem is occurring due to the declaration of global variables in the child script. I will comment them out to test further.
    – Ibe
    Commented May 21, 2013 at 4:26
  • 1
    Post a complete code sample that reproduces the problem otherwise we are getting nowhere.
    – blah238
    Commented May 21, 2013 at 5:20
  • Main error source was: saving raster data with FGDBR or GRID format. So I changed environmental settings and set scratch workspace as an intermediate folder on hard disk, instead of "Default.gdb". It solved the issue. Thanks everyone for answers.
    – Ibe
    Commented May 23, 2013 at 16:05

you may want to change




this should run the script.


Both suggestions by Hotpepper worked for me. Perhaps you should consider:



I mean (\\) instead to (/)

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