"up-to-date" should only use hyphens when used as compound modifier of a noun

chrome/common/extensions/docs/server2/new_github_file_system.py

 # Copyright 2013 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 json
 import logging
 from cStringIO import StringIO
 import posixpath
 import traceback
 from zipfile import ZipFile
@@ skipping 108 matching lines @@
         repo,
         object_store_creator or ObjectStoreCreator.ForTest(),
         fake_fetcher)
 
   def __init__(self, base_url, owner, repo, object_store_creator, Fetcher):
     self._repo_key = posixpath.join(owner, repo)
     self._repo_url = posixpath.join(base_url, owner, repo)
     self._username, self._password = _LoadCredentials(object_store_creator)
     self._blobstore = blobstore.AppEngineBlobstore()
     self._fetcher = Fetcher(self._repo_url)
-    # Stores whether the github is up-to-date. This will either be True or
+    # Stores whether the github is up to date. This will either be True or
     # empty, the emptiness most likely due to this being a cron run.
     self._up_to_date_cache = object_store_creator.Create(
         GithubFileSystem, category='up-to-date')
     # Caches the zip file's stat. Overrides start_empty=False and use
     # |self._up_to_date_cache| to determine whether we need to refresh.
     self._stat_cache = object_store_creator.Create(
         GithubFileSystem, category='stat-cache', start_empty=False)
 
     # Created lazily in |_EnsureRepoZip|.
     self._repo_zip = None
@@ skipping 145 matching lines @@
                                       for p in repo_zip.List(path))
     return stat_info
 
   def GetIdentity(self):
     return '%s' % StringIdentity(self.__class__.__name__ + self._repo_key)
 
   def __repr__(self):
     return '%s(key=%s, url=%s)' % (type(self).__name__,
                                    self._repo_key,
                                    self._repo_url)