Fix import order with isort tool.

tools/telemetry/telemetry/page/page_set.py

 # Copyright 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import csv
 import inspect
 import os
 
 from telemetry.core import util
 from telemetry.page import page as page_module
 from telemetry.page import page_set_archive_info
 from telemetry.util import cloud_storage
 
-
 PUBLIC_BUCKET = cloud_storage.PUBLIC_BUCKET
 PARTNER_BUCKET = cloud_storage.PARTNER_BUCKET
 INTERNAL_BUCKET = cloud_storage.INTERNAL_BUCKET
 
 
 class PageSetError(Exception):
   pass
 
 
 class PageSet(object):
@@ skipping 156 matching lines @@
     return self.pages.__iter__()
 
   def __len__(self):
     return len(self.pages)
 
   def __getitem__(self, key):
     return self.pages[key]
 
   def __setitem__(self, key, value):
     self.pages[key] = value