Arcmap Python add-in wizard run code on start-up/open document

Question

I have the following code that I want to run each time a Arcmap is open:

Windows 7 ArcMap 10.3.1

I have followed the instructions here: http://resources.arcgis.com/en/help/main/10.1/index.html#//014p00000018000000

It's suppose to run on an OpenDocument event. However the code does not run. If I copy paste into the python window in Arcmap it works fine, any ideas?

import arcpy
import pythonaddins
import getpass

class OnOpen(object):
    """Implementation for RunOnOpen_addin.OnStart (Extension)"""
    def __init__(self):
        # For performance considerations, please remove all unused methods in this class.
        self.enabled = True
        OnOpen.openDocument(self)
    def openDocument(self):
        mxd = arcpy.mapping.MapDocument("CURRENT")
        text_elements = arcpy.mapping.ListLayoutElements(mxd,"TEXT_ELEMENT")
        username = getpass.getuser()
        initial = username[0]
        lastname = username[1:]
        name = initial.title() + ". " + lastname.title()

        for element in text_elements:
            if element.name == 'Producer':
                element.text = "Producer: " + name

OnOpen()

Answer 1

I played around with this a little bit and could not get the openDocument or newDocument events to fire. I was able to get the startup event to fire and tested by creating a text file. I am on ArcMap 10.3.1 and Win7 x64.

Here is my code:

import arcpy
import pythonaddins

class Py2(object):
    """Implementation for ArcGISAddIns_addin.extension2 (Extension)"""
    def __init__(self):
        # For performance considerations, please remove all unused methods in this class.
        self.enabled = True
    def startup(self):
        open('C:\\Test.txt', 'w')

Instead of creating a text file, I tried editing the MXD properties. It seemed to be hit or miss sometimes. I got it to work once but couldn't repeat it. There may be a chance that the MapDocument instance isn't fully initialized by then? You could try to cross-post this to GeoNet to get an expanded user base to answer. If it comes down to it, contact ESRI support to see if they could be of further assistance.