[python] помогите поймать ошибку

#!/usr/bin/env python3

from gi.repository import Gtk
import os
import subprocess

class Parser():
    def __init__(self):
        self.cpu_info = []
        self.os_info = []
        self.kernel_info = []
        self.users_info = []
    def parse_cpu_info(self):
        pipe = subprocess.Popen(['hardinform', '-c'], 0, None, None,subprocess.PIPE)
        test = lambda x,y: x[:len(y)] == y
        access_count = 0
        cpu_info = self.cpu_info
        cpu_info.append({})
        x = 0
        a = pipe.stdout.readline()
        while a:
            if access_count == 8:
                access_count = 0
                x += 1
                cpu_info.append({})
            if test(a, '\tCPU:'):
                cpu_info[x]['CPU'] = a[len('\tCPU:'):]
                print("CPU number parsed successfully")
                access_count += 1
            elif test(a, '\t\tModel name:'):
                cpu_info[x]['Model name'] = a[len('\t\tModel name:'):]
                access_count += 1
            elif test(a, '\t\tCurrent processor speed in MHz:'):
                cpu_info[x]['Current speed in MHz'] = a[len('\t\tCurrent processor speed in MHz:'):]
                access_count += 1
            elif test(a, '\t\tProcessor cache size:'):
                cpu_info[x]['Cache size'] = a[len('\t\tProcessor cache size:'):]
                access_count += 1
            elif test(a, '\t\tProcessor speed in Bogomips:'):
                cpu_info[x]['Speed in bgmps'] = a[len('\t\tProcessor speed in Bogomips:'):]
                access_count += 1
            elif test(a, '\t\tTemperature:'):
                cpu_info[x]['Temperature'] = a[len('\t\tTemperature:'):]
                access_count += 1
            elif test(a, '\t\tCritical temperature:'):
                cpu_info[x]['Crit temperature'] = a[len('\t\tCritical temperature:'):]
                access_count += 1
            a = pipe.stdout.readline()
    def parse_os_info(self):
        pipe = subprocess.Popen(['hardinform', '-c'])
        test = lambda x,y: x[len(y):] == y
        a = str()
        while a == pipe.communicate()[0]:
            if test.call(a, '\t\tOS version:'):
                pass
            elif test.call(a, '\t\tUptime:'):
                pass
    def parse(self):
        self.parse_cpu_info() 
        #return self.cpu_info
        
class Handler():
    def __init__(self, user_data):
        self.data = user_data
    def add_items_to_categories_tree(self, widget):
        treestore = self.data['categories_tree_store']
        cpu = treestore.append(None, ('CPU',)) 
        os = treestore.append(None, ('OS',))
        users = treestore.append(os, ('Users',))
        kernel = treestore.append(os, ('Kernel',))
    def on_status_icon_activated(self):
        pass
    def on_status_icon_popup_menu(self, status_icon, button, activate_time):
        self.data['status_icon_context_menu'].popup(None, None , self.data['status_icon'].position_menu, self.data['status_icon'], button, activate_time)
    def on_main_window_delete(self, widget, event):
        widget.hide()
    def cpu_item_selected(self):
        pass
    def os_item_selected(self):
        pass
    def kernel_item_selected(self):
        pass
    def users_item_selected(self):
        pass
    def on_categories_tree_row_activated(self, a, v, f):
        text = self.data['categories_tree_curr_text'].props.text
        if text == 'CPU':
            self.cpu_item_selected()
        elif text == 'OS':
            self.os_item_selected()
        elif text == 'Kernel':
            self.kernel_item_selected()
        elif text == 'Users':
            self.users_item_selected()

class Main():
    def __init__(self):
        parser = Parser()
        cpu_data = parser.cpu_info
        print(cpu_data[0]['CPU'])  # вот тут ошибка
        user_data = {}
        gtk_builder = Gtk.Builder()
        gtk_builder.add_from_file("/home/inish777/hardinform/share/hardinform-gui.ui")
        user_data['main_window'] = main_window = gtk_builder.get_object("main_window")
        user_data['categories_tree_curr_text'] = gtk_builder.get_object('curr_categories_tree_text')
        user_data['categories_tree_store'] = gtk_builder.get_object('categories_tree_store')
        user_data['information_tree_store'] = gtk_builder.get_object('information_tree_store')
        user_data['place_for_widgets'] = gtk_builder.get_object('place_for_widgets')
        user_data['status_icon'] = gtk_builder.get_object('hardinform_status_icon')
        user_data['status_icon_context_menu'] = gtk_builder.get_object('status_icon_context_menu')
        user_data['main_hbox'] = gtk_builder.get_object('main_hbox')
        gtk_builder.connect_signals(Handler(user_data))
        main_window.show_all()
        Gtk.main()
Main()