fix pylint warnings

native_client_sdk/src/build_tools/sdk_tools/sdk_update.py

 #!/usr/bin/env python
 # Copyright (c) 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.
 
 """Shim script for the SDK updater, to allow automatic updating.
 
 The purpose of this script is to be a shim which automatically updates
 sdk_tools (the bundle containing the updater scripts) whenever this script is
 run.
 
 When the sdk_tools bundle has been updated to the most recent version, this
 script forwards its arguments to sdk_updater_main.py.
 """
 
 import os
 import subprocess
-from sdk_update_common import *
+from sdk_update_common import RenameDir, RemoveDir, Error
 import sys
 import tempfile
 
 
 SCRIPT_DIR = os.path.dirname(os.path.abspath(__file__))
 SDK_UPDATE_MAIN = os.path.join(SCRIPT_DIR, 'sdk_update_main.py')
 SDK_ROOT_DIR = os.path.dirname(SCRIPT_DIR)
 NACLSDK_SHELL_SCRIPT = os.path.join(SDK_ROOT_DIR, 'naclsdk')
 if sys.platform.startswith('win'):
   NACLSDK_SHELL_SCRIPT += '.bat'
@@ skipping 47 matching lines @@
           ' viewing or accessing this directory and try again.\n' % (
           SDK_TOOLS_DIR,))
       sys.exit(1)
 
     try:
       RenameDir(SDK_TOOLS_UPDATE_DIR, SDK_TOOLS_DIR)
     except Error:
       # Failed for some reason, move the old dir back.
       try:
         RenameDir(temp_sdktools, SDK_TOOLS_DIR)
-      except:
+      except Error:
         # Not much to do here. sdk_tools won't exist, but sdk_tools_update
         # should. Hopefully running the batch script again will move
         # sdk_tools_update -> sdk_tools and it will work this time...
         sys.stderr.write('Unable to restore directory "%s" while auto-updating.'
             'Make sure no programs are viewing or accessing this directory and'
             'try again.\n' % (SDK_TOOLS_DIR,))
         sys.exit(1)
   finally:
     RemoveDir(tempdir)
 
 
 def main():
   args = sys.argv[1:]
   if UpdateSDKTools(args):
     RenameSdkToolsDirectory()
     # Call the shell script, just in case this script was updated in the next
     # version of sdk_tools
     return subprocess.call([NACLSDK_SHELL_SCRIPT] + args)
   else:
     return subprocess.call(MakeSdkUpdateMainCmd(args))
-    
+
 
 if __name__ == '__main__':
   sys.exit(main())