Python Addin: Unbound Method Error

MikeMacRae — Sun, 12 Dec 2021 03:05:43 GMT

Hi folks,

I'm running into an isse trying to build a python with an Extension Class, to be used to do some logic when a layer is added or removed from the mxd (itemAdded(), itemDeleted() built in functions)

So, I had orginally built a toolbar which included 2 comboboxes and a button and then the Extension Class. I wanted to test how the functions worked, so I left the Extension Class functions as the default coding and just threw in a couple print lines to see if they printed out the message in the python console in Arcmap when I added or removed a layer. The problem I am having is, it keeps throwing an error:

TypeError: unbound method itemAdded() must be called with ExtensionClass instance as first argument (got Layer instance instead)

I've been pouring through the net, trying to understand what an unbound method is, but I'm still not at a point where I understand how to resolve this error.

I tested again but simply creating a new addin project with one Extension Class and then the 2 fucntions above (itemAdded(), itemDeleted()). I threw a couple print lines in the functions to see if they fired off properly and success.

Further to that, I commented out all of my code in my original script, except the Extension Class (so that it has the exact same code as my test addin), fired up Arcmap and added a layer and it still throws the error.

Can anyone suggest what I am missing?

Test Addin Code (that works)

import arcpy
import pythonaddins

class ExtensionClass(object):
    """Implementation for Addins_addin.ExtensionClass (Extension)"""
    def __init__(self):
        # For performance considerations, please remove all unused methods in this class.
        self.enabled = True
        print self
    def itemAdded(self, new_item):
        print "Added " + new_item.name
        pass
    def itemDeleted(self, deleted_item):
        print "Deleted " + deleted_item.name
        pass

Original Code here:

import arcpy
import pythonaddins

cboSetup1 = None
cboSetup2 = None
lyr = None

class ExtensionClass(object):
    """Implementation for Build_Definition_Query_from_Selected_Features_addin.ExtensionClass (Extension)"""
    def __init__(self):
        # For performance considerations, please remove all unused methods in this class.
        self.enabled = True
        print self
    def itemAdded(self, new_item):
        print "Added"
        pass
    def itemDeleted(self, deleted_item):
        print "Deleted"
        pass


class btn1(object):
    """Implementation for Build_Definition_Query_from_Selected_Features_addin.btn1 (Button)"""
    def __init__(self):

        mxd = arcpy.mapping.MapDocument("CURRENT")
        self.items = []
        global lyrDefQueryDict
        lyrDefQueryDict = {}
        for layer in arcpy.mapping.ListLayers(mxd):
            if not layer.isGroupLayer:
                self.items.append(layer.name)
                lyrDefQueryDict[layer.name] = layer.definitionQuery
        print lyrDefQueryDict
        self.enabled = True
        self.checked = False
        
        
    def onClick(self):
        combo1 = cbobox1
        combo1.btnPopulate()
        combo1.refresh()
        combo2 = cbobox2
        combo2.value = ''
        combo2.refresh()
        if lyr:
            for lyrName,lyrDefQuery in lyrDefQueryDict.iteritems():             
                if lyr.name == lyrName:
                    print "lyr.name = " + lyr.name
                    print "lyrName = " + lyrName
                    print "lyrDef = " + lyrDefQuery
                    lyr.definitionQuery = lyrDefQuery
        arcpy.RefreshActiveView()
        
class cbobox1(object):
    """Implementation for Build_Definition_Query_from_Selected_Features_addin.cbobox1 (ComboBox)"""
    def __init__(self):
        mxd = arcpy.mapping.MapDocument("CURRENT")
        self.items = []
        for layer in arcpy.mapping.ListLayers(mxd):
            if not layer.isGroupLayer:
                self.items.append(layer.name)
        global cboSetup1
        cboSetup1 = self.items
        self.editable = True
        self.enabled = True
        self.dropdownWidth = 'WWWWWWWWWWWWWWWWWW'
        self.width = 'WWWWWWWWWWWWWWWWW'
        
    def onSelChange(self, selection):
        mxd = arcpy.mapping.MapDocument("CURRENT")
        for layer in arcpy.mapping.ListLayers(mxd):
            if layer.name == selection:
                global lyr
                lyr = layer
                print layer.name
                fieldList = [field.name for field in arcpy.ListFields(layer.name)]
                global cboSetup2
                cboSetup2 = fieldList
                cbobox2.updateFields()
              
    def onFocus(self, focused):
        self.items = cboSetup1
        
    def btnPopulate(self):
        self.value = ''
        mxd = arcpy.mapping.MapDocument("CURRENT")
        self.items = []
        for layer in arcpy.mapping.ListLayers(mxd):
            if not layer.isGroupLayer:
                self.items.append(layer.name)
        global cboSetup1
        cboSetup1 = self.items

class cbobox2(object):
    """Implementation for Build_Definition_Query_from_Selected_Features_addin.cbobox2 (ComboBox)"""
    def __init__(self):
        self.editable = True
        self.enabled = True
        self.dropdownWidth = 'WWWWWWWWWWWWWWWWW'
        self.width = 'WWWWWWWWWWWWWWWWW'
        
    def onFocus(self, focused):
        self.items = cboSetup2

    def onSelChange(self, selection):
        selectionList = []
        for row in arcpy.SearchCursor(lyr):
            selectionList.append(row.getValue(selection))
        if len(selectionList) == 1:
               lyr.definitionQuery = "{0} = {1}".format(selection,selectionList[0])
        else:
               lyr.definitionQuery = "{0} in {1}".format(selection,tuple(selectionList))
        arcpy.RefreshActiveView()

    def updateFields(self):
        self.items = cboSetup2

Re: Python Addin: Unbound Method Error

MikeMacRae — Fri, 31 Jul 2015 22:28:42 GMT

Just to follow up on this topic. I think the error was caused by having too many test addins created in Arcmap. I had a few of them and I went and cleaned out all the addins and then re-initialized my final one. This cleaned up the error message.

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Python Addin: Unbound Method Error

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