Editing of Login Items in user context using PyObjC

EditLoginItems.py

import sys
import Cocoa
import CoreFoundation
from LaunchServices import LSSharedFileListCreate, kLSSharedFileListSessionLoginItems, LSSharedFileListCopySnapshot, kLSSharedFileListItemBeforeFirst, LSSharedFileListItemCopyDisplayName, LSSharedFileListInsertItemURL

TO_ADD_NAME = "YourAppName"
TO_ADD_PATH = "/Applications/YourAppname.app/"

items    = LSSharedFileListCreate(CoreFoundation.kCFAllocatorDefault, kLSSharedFileListSessionLoginItems, None)
snapshot = LSSharedFileListCopySnapshot(items, None)
names    = [LSSharedFileListItemCopyDisplayName(item) for item in snapshot[0]]

if TO_ADD_NAME in names:
	# Item is already a login item...
	sys.exit()

item = Cocoa.NSURL.alloc().init()

name = Cocoa.NSString.alloc().initWithString_(TO_ADD_NAME)
path = "file://localhost%s" % (TO_ADD_PATH)
url = Cocoa.NSString.alloc().initWithString_(path)

item = Cocoa.NSURL.URLWithString_(url.stringByAddingPercentEscapesUsingEncoding_(Cocoa.NSASCIIStringEncoding))

LSSharedFileListInsertItemURL(items, kLSSharedFileListItemBeforeFirst, name, None, item, None, None)
CoreFoundation.CFPreferencesSynchronize(CoreFoundation.kCFPreferencesAnyApplication,CoreFoundation.kCFPreferencesCurrentUser,CoreFoundation.kCFPreferencesCurrentHost)