[Android] Fix new pylint errors in build/android/.

build/android/provision_devices.py

 #!/usr/bin/env python
 #
 # Copyright (c) 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.
 
 """Provisions Android devices with settings required for bots.
 
 Usage:
   ./provision_devices.py [-d <device serial number>]
@@ skipping 13 matching lines @@
 from pylib.device import device_blacklist
 from pylib.device import device_errors
 from pylib.device import device_utils
 from pylib.utils import run_tests_helper
 
 sys.path.append(os.path.join(constants.DIR_SOURCE_ROOT,
                              'third_party', 'android_testrunner'))
 import errors
 
 def KillHostHeartbeat():
-  ps = subprocess.Popen(['ps', 'aux'], stdout = subprocess.PIPE)
+  ps = subprocess.Popen(['ps', 'aux'], stdout=subprocess.PIPE)
   stdout, _ = ps.communicate()
   matches = re.findall('\\n.*host_heartbeat.*', stdout)
   for match in matches:
     logging.info('An instance of host heart beart running... will kill')
-    pid = re.findall('(\S+)', match)[1]
+    pid = re.findall(r'(\S+)', match)[1]
     subprocess.call(['kill', str(pid)])
 
 
 def LaunchHostHeartbeat():
   # Kill if existing host_heartbeat
   KillHostHeartbeat()
   # Launch a new host_heartbeat
   logging.info('Spawning host heartbeat...')
   subprocess.Popen([os.path.join(constants.DIR_SOURCE_ROOT,
                                  'build/android/host_heartbeat.py')])
@@ skipping 149 matching lines @@
     for prop in props:
       logging.info('  %s' % prop)
     if options.auto_reconnect:
       PushAndLaunchAdbReboot(device, options.target)
   except (errors.WaitForResponseTimedOutError,
           device_errors.CommandTimeoutError):
     logging.info('Timed out waiting for device %s. Adding to blacklist.',
                  str(device))
     # Device black list is reset by bb_device_status_check.py per build.
     device_blacklist.ExtendBlacklist([str(device)])
-  except (device_errors.CommandFailedError):
+  except device_errors.CommandFailedError:
     logging.exception('Failed to provision device %s. Adding to blacklist.',
                       str(device))
     device_blacklist.ExtendBlacklist([str(device)])
 
 
 def ProvisionDevices(options):
   is_perf = 'perf' in os.environ.get('BUILDBOT_BUILDERNAME', '').lower()
   if options.device is not None:
     devices = [options.device]
   else:
@@ skipping 31 matching lines @@
 
   if args:
     print >> sys.stderr, 'Unused args %s' % args
     return 1
 
   return ProvisionDevices(options)
 
 
 if __name__ == '__main__':
   sys.exit(main(sys.argv))