Open UserPrefs and expand #Blender #BSE

blender-open-user-prefs-and-expand-addon.py

import bpy
import addon_utils

# Set Addon Tab
bpy.context.user_preferences.active_section = 'ADDONS'

# Set Filter
bpy.context.window_manager.addon_search = "Addon Name"

# Get a module reference by name
mod = addon_utils.addons_fake_modules.get("filename")

# If found, expand it
if mod is not None: mod.bl_info['show_expanded'] = True

# Call window
bpy.ops.screen.userpref_show('INVOKE_DEFAULT')