Lint bisect-related modules; obey pylint.

scripts/slave/recipe_modules/bisect_tester/perf_test.py

 # Copyright 2015 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 os
 import time
 
 from . import parse_metric
 
 
 def run_perf_test(api, test_config):
   """Runs the command N times and parses a metric from the output."""
   limit = time.time() + test_config['timeout_seconds']
   values = []
   metric = test_config['metric'].split('/')
   for i in range(test_config['repeat_count']):
     if time.time() < limit:
       command_name = "Performance Test %d/%d" % (i + 1,
-                                                test_config['repeat_count'])
+                                                 test_config['repeat_count'])
       if api.m.platform.is_linux:
         os.environ['CHROME_DEVEL_SANDBOX'] = api.m.path.join(
             '/opt', 'chromium', 'chrome_sandbox')
       out, err = _run_command(api, test_config['command'], command_name)
       if out is None and err is None:
-        #dummy value when running test TODO: replace with a mock
+        # dummy value when running test TODO: replace with a mock
         values.append(0)
       else:  # pragma: no cover
         valid_value, value = parse_metric.parse_metric(out, err, metric)
         assert valid_value
         values.extend(value)
     else:  # pragma: no cover
       break
   return values
 
 
 def truncate_and_aggregate(api, values, truncate_percent):
   truncate_proportion = truncate_percent / 100.0
   mean = api.m.math_utils.truncated_mean(values, truncate_proportion)
   std_err = api.m.math_utils.standard_error(values)
   return {'mean': mean, 'std_err': std_err, 'values': values}
 
 
 def _run_command(api, command, command_name):
   command_parts = command.split()
   stdout = api.m.raw_io.output()
   stderr = api.m.raw_io.output()
   step_result = api.m.step(
       command_name,
       command_parts,
       stdout=stdout,
       stderr=stderr)
   return step_result.stdout, step_result.stderr