[dovetail_tool] Fix the python style scanned by flake8

JIRA: DOVETAIL-34

Change-Id: Ib9a6dd254f1d77b0cbbfa66e8e1e44df1ce14a4b
Signed-off-by: xudan <xudan16@huawei.com>

9 files changed, 142 insertions, 103 deletions

diff --git a/dovetail/conf/dovetail_config.py b/dovetail/conf/dovetail_config.py
index f822d3ad..6f3eebf2 100644
--- a/dovetail/conf/dovetail_config.py
+++ b/dovetail/conf/dovetail_config.py
@@ -7,13 +7,13 @@
 # http://www.apache.org/licenses/LICENSE-2.0
 #
 
+import yaml
+import os
+
 CERT_PATH = './cert/'
 TESTCASE_PATH = './testcase/'
 SCENARIO_NAMING_FMT = 'certification_%s'
 
-import yaml
-import os
-
 curr_path = os.path.dirname(os.path.abspath(__file__))
 with open(os.path.join(curr_path, 'dovetail_config.yml')) as f:
     dovetail_config = yaml.safe_load(f)
diff --git a/dovetail/container.py b/dovetail/container.py
index 918edb33..54c43adc 100644
--- a/dovetail/container.py
+++ b/dovetail/container.py
@@ -9,14 +9,14 @@
 
 import utils.dovetail_logger as dt_logger
 import utils.dovetail_utils as dt_utils
-from conf.dovetail_config import *
-
+from conf.dovetail_config import dovetail_config
 logger = dt_logger.Logger('container.py').getLogger()
 
+
 class Container:
 
     container_list = {}
-    has_pull_latest_image = {'yardstick':False, 'functest':False}
+    has_pull_latest_image = {'yardstick': False, 'functest': False}
 
     def __init__(cls):
         pass
@@ -30,40 +30,45 @@ class Container:
 
     @classmethod
     def get_docker_image(cls, type):
-        return '%s:%s' % (dovetail_config[type]['image_name'], dovetail_config[type]['docker_tag'])
+        return '%s:%s' % (dovetail_config[type]['image_name'],
+                          dovetail_config[type]['docker_tag'])
 
     @classmethod
     def create(cls, type):
-        #sshkey="-v /root/.ssh/id_rsa:/root/.ssh/id_rsa "
+        # sshkey="-v /root/.ssh/id_rsa:/root/.ssh/id_rsa "
         docker_image = cls.get_docker_image(type)
         envs = dovetail_config[type]['envs']
         opts = dovetail_config[type]['opts']
         sshkey = ''
-        result_volume = ' -v %s:%s ' % (dovetail_config['result_dir'],dovetail_config[type]['result']['dir'])
-        cmd = 'sudo docker run %s %s %s %s %s /bin/bash' % (opts, envs, sshkey, result_volume, docker_image)
-        dt_utils.exec_cmd(cmd,logger)
-        ret, container_id=dt_utils.exec_cmd("sudo docker ps | grep "+ docker_image + " | awk '{print $1}' | head -1",logger)
+        result_volume = ' -v %s:%s ' % (dovetail_config['result_dir'],
+                                        dovetail_config[type]['result']['dir'])
+        cmd = 'sudo docker run %s %s %s %s %s /bin/bash' % \
+              (opts, envs, sshkey, result_volume, docker_image)
+        dt_utils.exec_cmd(cmd, logger)
+        ret, container_id = \
+            dt_utils.exec_cmd("sudo docker ps | grep " + docker_image +
+                              " | awk '{print $1}' | head -1", logger)
         cls.container_list[type] = container_id
         return container_id
 
     @classmethod
     def pull_image(cls, type):
         docker_image = cls.get_docker_image(type)
-        if cls.has_pull_latest_image[type] == True:
+        if cls.has_pull_latest_image[type] is True:
             logger.debug('%s is already the newest version.' % (docker_image))
         else:
             cmd = 'sudo docker pull %s' % (docker_image)
-            dt_utils.exec_cmd(cmd,logger)
+            dt_utils.exec_cmd(cmd, logger)
             cls.has_pull_latest_image[type] = True
 
     @classmethod
     def clean(cls, container_id):
         cmd1 = 'sudo docker stop %s' % (container_id)
-        dt_utils.exec_cmd(cmd1,logger)
+        dt_utils.exec_cmd(cmd1, logger)
         cmd2 = 'sudo docker rm %s' % (container_id)
-        dt_utils.exec_cmd(cmd2,logger)
+        dt_utils.exec_cmd(cmd2, logger)
 
     @classmethod
     def exec_cmd(cls, container_id, sub_cmd, exit_on_error=False):
         cmd = 'sudo docker exec %s /bin/bash -c "%s"' % (container_id, sub_cmd)
-        dt_utils.exec_cmd(cmd,logger,exit_on_error)
+        dt_utils.exec_cmd(cmd, logger, exit_on_error)
diff --git a/dovetail/parser.py b/dovetail/parser.py
index 1c0c0450..a9edb36e 100644
--- a/dovetail/parser.py
+++ b/dovetail/parser.py
@@ -12,10 +12,10 @@ import jinja2
 
 import utils.dovetail_logger as dt_logger
 import utils.dovetail_utils as dt_utils
+from conf.dovetail_config import dovetail_config
 
 logger = dt_logger.Logger('parser.py').getLogger()
 
-from conf.dovetail_config import *
 
 class Parser:
     '''preprocess configuration files'''
@@ -29,9 +29,10 @@ class Parser:
             for arg in dovetail_config['parameters']:
                 path = eval(arg['path'])
                 logger.debug('name: %s, eval path: %s ' % (arg['name'], path))
-                kwargs[arg['name']] = dt_utils.get_obj_by_path(testcase.testcase,path)
+                kwargs[arg['name']] = \
+                    dt_utils.get_obj_by_path(testcase.testcase, path)
 
-            logger.debug('kwargs: %s' %  kwargs)
+            logger.debug('kwargs: %s' % kwargs)
             cmd_lines = template.render(**kwargs)
         except Exception as e:
             logger.error('failed to parse cmd %s, exception:%s' % (cmd, e))
diff --git a/dovetail/prepare_env.py b/dovetail/prepare_env.py
index bd484302..785d5c3d 100644
--- a/dovetail/prepare_env.py
+++ b/dovetail/prepare_env.py
@@ -7,8 +7,6 @@
 # http://www.apache.org/licenses/LICENSE-2.0
 #
 
-import os
-
 import utils.dovetail_logger as dt_logger
 import utils.dovetail_utils as dt_utils
 
@@ -20,4 +18,3 @@ dt_utils.exec_cmd(cmd, logger)
 
 cmd = "sudo pip install click pyyaml jinja2"
 dt_utils.exec_cmd(cmd, logger)
-
diff --git a/dovetail/report.py b/dovetail/report.py
index 5dfa5890..c937011f 100644
--- a/dovetail/report.py
+++ b/dovetail/report.py
@@ -9,24 +9,26 @@
 import json
 import urllib2
 import re
+import os
 
 import utils.dovetail_logger as dt_logger
-import utils.dovetail_utils as dt_utils
 
-from conf.dovetail_config import *
-from testcase import *
+from conf.dovetail_config import dovetail_config
+from testcase import Testcase
 
 logger = dt_logger.Logger('report.py').getLogger()
 
+
 def get_pass_str(passed):
     if passed:
         return 'PASS'
     else:
         return 'FAIL'
 
+
 class Report:
 
-    results = {'functest':{},'yardstick':{}}
+    results = {'functest': {}, 'yardstick': {}}
 
     @classmethod
     def check_result(cls, testcase, db_result):
@@ -38,32 +40,37 @@ class Report:
         report = ''
 
         report += '\n\
-+=============================================================================+\n\
-|                                   report                                    | \n\
-+-----------------------------------------------------------------------------+\n'
++==========================================================================+\n\
+|                                   report                                 |\n\
++--------------------------------------------------------------------------+\n'
         report += '|scenario: %s\n' % scenario_yaml['name']
         for testcase_name in scenario_yaml['testcase_list']:
             testcase = Testcase.get(testcase_name)
-            report += '|   [testcase]: %s\t\t\t\t[%s]\n' % (testcase_name, get_pass_str(testcase.passed()))
+            report += '|   [testcase]: %s\t\t\t\t[%s]\n' % \
+                (testcase_name, get_pass_str(testcase.passed()))
             report += '|   |-objective: %s\n' % testcase.objective()
             if testcase.sub_testcase() is not None:
                 for subtest in testcase.sub_testcase():
-                    report += '|       |-%s \t\t [%s]\n' % (subtest, get_pass_str(testcase.sub_testcase_passed(subtest)))
-            report += '+-----------------------------------------------------------------------------+\n'
+                    report += '|       |-%s \t\t [%s]\n' % \
+                        (subtest,
+                         get_pass_str(testcase.sub_testcase_passed(subtest)))
+            report += '+-----------------------------------------------------'
+            report += '---------------------+\n'
 
         logger.info(report)
         cls.save(report)
         return report
 
-    #save to disk as default
+    # save to disk as default
     @classmethod
     def save(cls, report):
         report_file_path = dovetail_config['report_file']
         try:
-            with open(os.path.join(dovetail_config['result_dir'], report_file_path),'w') as report_file:
+            with open(os.path.join(dovetail_config['result_dir'],
+                      report_file_path), 'w') as report_file:
                 report_file.write(report)
             logger.info('save report to %s' % report_file_path)
-        except Exception as e:
+        except Exception:
             logger.error('Failed to save: %s' % report_file_path)
 
     @classmethod
@@ -83,9 +90,11 @@ class Report:
             logger.debug('testcase: %s -> result acquired' % script_testcase)
         else:
             retry = testcase.increase_retry()
-            logger.debug('testcase: %s -> result acquired retry:%d' % (script_testcase, retry))
+            logger.debug('testcase: %s -> result acquired retry:%d' %
+                         (script_testcase, retry))
         return result
 
+
 class CrawlerFactory:
 
     @classmethod
@@ -98,6 +107,7 @@ class CrawlerFactory:
 
         return None
 
+
 class FunctestCrawler:
 
     def __init__(self):
@@ -112,7 +122,9 @@ class FunctestCrawler:
             return self.crawl_from_url(testcase)
 
     def crawl_from_file(self, testcase=None):
-        file_path = os.path.join(dovetail_config['result_dir'],dovetail_config[self.type]['result']['file_path'])
+        file_path = \
+            os.path.join(dovetail_config['result_dir'],
+                         dovetail_config[self.type]['result']['file_path'])
         if not os.path.exists(file_path):
             logger.info('result file not found: %s' % file_path)
             return None
@@ -130,15 +142,17 @@ class FunctestCrawler:
             if failed_num != 0:
                 criteria = 'FAIL'
 
-            match =  re.findall('Ran: (\d*) tests in (\d*)\.\d* sec.', output)
+            match = re.findall('Ran: (\d*) tests in (\d*)\.\d* sec.', output)
             num_tests, dur_sec_int = match[0]
-            json_results = {'criteria':criteria,'details':{"timestart": '', "duration": int(dur_sec_int),
+            json_results = {'criteria': criteria, 'details': {"timestart": '',
+                            "duration": int(dur_sec_int),
                             "tests": int(num_tests), "failures": failed_num,
                             "errors": error_logs}}
             logger.debug('Results: %s' % str(json_results))
             return json_results
         except Exception as e:
-            logger.error('Cannot read content from the file: %s, exception: %s' % (file_path, e))
+            logger.error('Cannot read content from the file: %s, exception: %s'
+                         % (file_path, e))
             return None
 
     def crawl_from_url(self, testcase=None):
@@ -148,9 +162,11 @@ class FunctestCrawler:
             data = json.load(urllib2.urlopen(url))
             return data['results'][0]
         except Exception as e:
-            logger.error("Cannot read content from the url: %s, exception: %s" % (url, e))
+            logger.error("Cannot read content from the url: %s, exception: %s"
+                         % (url, e))
             return None
 
+
 class YardstickCrawler:
 
     def __init__(self):
@@ -165,28 +181,31 @@ class YardstickCrawler:
             return self.crawl_from_url(testcase)
 
     def crawl_from_file(self, testcase=None):
-        file_path = os.path.join(dovetail_config['result_dir'], testcase+'.out')
+        file_path = os.path.join(dovetail_config['result_dir'],
+                                 testcase+'.out')
         if not os.path.exists(file_path):
             logger.info('result file not found: %s' % file_path)
             return None
         try:
             with open(file_path, 'r') as myfile:
-                output = myfile.read()
+                myfile.read()
             criteria = 'PASS'
-            json_results = {'criteria':criteria}
+            json_results = {'criteria': criteria}
             logger.debug('Results: %s' % str(json_results))
             return json_results
         except Exception as e:
-            logger.error('Cannot read content from the file: %s, exception: %s' % (file_path, e))
+            logger.error('Cannot read content from the file: %s, exception: %s'
+                         % (file_path, e))
             return None
 
     def crawl_from_url(self, testcase=None):
         return None
 
+
 class CheckerFactory:
 
     @classmethod
-    def create(cls,type):
+    def create(cls, type):
         if type == 'functest':
             return FunctestChecker()
 
@@ -195,17 +214,19 @@ class CheckerFactory:
 
         return None
 
+
 class ResultChecker:
 
     def check(cls):
         return 'PASS'
 
+
 class FunctestChecker:
 
     def check(cls, testcase, db_result):
         if not db_result:
             for sub_testcase in testcase.sub_testcase():
-                testcase.sub_testcase_passed(sub_testcase,False)
+                testcase.sub_testcase_passed(sub_testcase, False)
             return
 
         testcase.passed(db_result['criteria'] == 'PASS')
@@ -213,7 +234,7 @@ class FunctestChecker:
         if testcase.sub_testcase() is None:
             return
 
-        if testcase.testcase['passed'] == True:
+        if testcase.testcase['passed'] is True:
             for sub_testcase in testcase.sub_testcase():
                 testcase.sub_testcase_passed(sub_testcase, True)
             return
@@ -229,6 +250,7 @@ class FunctestChecker:
 
         testcase.passed(all_passed)
 
+
 class YardstickChecker:
 
     def check(cls, testcase, result):
diff --git a/dovetail/run.py b/dovetail/run.py
index 85871fab..8fe27c59 100755
--- a/dovetail/run.py
+++ b/dovetail/run.py
@@ -9,28 +9,28 @@
 
 
 import click
-import yaml
-import os
-import time
 
 import utils.dovetail_logger as dt_logger
-import utils.dovetail_utils as dt_utils
 
 
 from container import Container
-from testcase import *
-from report import *
-from conf.dovetail_config import *
+from testcase import Testcase
+from testcase import Scenario
+from report import Report
+from conf.dovetail_config import SCENARIO_NAMING_FMT
 
 logger = dt_logger.Logger('run.py').getLogger()
 
+
 def load_scenario(scenario):
     Scenario.load()
     return Scenario.get(SCENARIO_NAMING_FMT % scenario)
 
+
 def load_testcase():
     Testcase.load()
 
+
 def run_test(scenario):
     for testcase_name in scenario['testcase_list']:
         logger.info('>>[testcase]: %s' % (testcase_name))
@@ -49,11 +49,12 @@ def run_test(scenario):
             logger.debug('container id:%s' % container_id)
 
             if not Testcase.prepared(testcase.script_type()):
-                cmds = Testcase.pre_condition(testcase.script_type())['cmds']
+                cmds = \
+                    Testcase.pre_condition_cls(testcase.script_type())['cmds']
                 if cmds:
                     for cmd in cmds:
                         Container.exec_cmd(container_id, cmd)
-                Testcase.prepared(testcase.script_type(),True)
+                Testcase.prepared(testcase.script_type(), True)
 
             if not testcase.prepare_cmd():
                 logger.error('failed to prepare testcase:%s' % testcase.name())
@@ -61,13 +62,14 @@ def run_test(scenario):
                 for cmd in testcase.cmds:
                     Container.exec_cmd(container_id, cmd)
 
-            #testcase.post_condition()
+            # testcase.post_condition()
 
             Container.clean(container_id)
 
         db_result = Report.get_result(testcase)
         Report.check_result(testcase, db_result)
 
+
 @click.command()
 @click.option('--scenario', default='basic', help='certification scenario')
 def main(scenario):
diff --git a/dovetail/testcase.py b/dovetail/testcase.py
index 4deabe2e..51714e37 100644
--- a/dovetail/testcase.py
+++ b/dovetail/testcase.py
@@ -7,16 +7,18 @@
 # http://www.apache.org/licenses/LICENSE-2.0
 #
 
-import jinja2
+import os
+import yaml
 
 import utils.dovetail_logger as dt_logger
-import utils.dovetail_utils as dt_utils
 
-from  parser import *
+from parser import Parser
+from conf.dovetail_config import CERT_PATH
+from conf.dovetail_config import TESTCASE_PATH
+from conf.dovetail_config import dovetail_config
 
 logger = dt_logger.Logger('testcase.py').getLogger()
 
-from conf.dovetail_config import *
 
 class Testcase:
 
@@ -25,11 +27,12 @@ class Testcase:
         self.testcase['passed'] = False
         self.cmds = []
         self.sub_testcase_status = {}
-        Testcase.update_script_testcase(self.script_type(), self.script_testcase())
+        Testcase.update_script_testcase(self.script_type(),
+                                        self.script_testcase())
 
     def prepare_cmd(self):
         for cmd in dovetail_config[self.script_type()]['testcase']['cmds']:
-            cmd_lines = Parser.parse_cmd(cmd,self)
+            cmd_lines = Parser.parse_cmd(cmd, self)
             if not cmd_lines:
                 return False
             self.cmds.append(cmd_lines)
@@ -61,33 +64,35 @@ class Testcase:
         return self.testcase['scripts']['testcase']
 
     def exceed_max_retry_times(self):
-        #logger.debug('retry times:%d' % self.testcase['retry'])
-        return Testcase._exceed_max_retry_times(self.script_type(), self.script_testcase())
+        # logger.debug('retry times:%d' % self.testcase['retry'])
+        return Testcase._exceed_max_retry_times(self.script_type(),
+                                                self.script_testcase())
 
     def increase_retry(self):
-        #self.testcase['retry'] = self.testcase['retry'] + 1
-        #return self.testcase['retry']
-        return Testcase._increase_retry(self.script_type(), self.script_testcase())
+        # self.testcase['retry'] = self.testcase['retry'] + 1
+        # return self.testcase['retry']
+        return Testcase._increase_retry(self.script_type(),
+                                        self.script_testcase())
 
-    def passed(self, passed = None):
+    def passed(self, passed=None):
         if passed is not None:
             self.testcase['passed'] = passed
         return self.testcase['passed']
 
     def script_result_acquired(self, acquired=None):
-        return Testcase._result_acquired(self.script_type(), self.script_testcase(), acquired)
+        return Testcase._result_acquired(self.script_type(),
+                                         self.script_testcase(), acquired)
 
     def pre_condition(self):
-        return Testcase.pre_condition(self.script_type())
+        return Testcase.pre_condition_cls(self.script_type())
 
     def post_condition(self):
-        return Testcase.post_condition(self.script_type())
+        return Testcase.post_condition_cls(self.script_type())
 
+    # testcase in upstream testing project
+    script_testcase_list = {'functest': {}, 'yardstick': {}}
 
-    #testcase in upstream testing project
-    script_testcase_list = {'functest':{}, 'yardstick':{}}
-
-    #testcase in dovetail
+    # testcase in dovetail
     testcase_list = {}
 
     @classmethod
@@ -103,23 +108,24 @@ class Testcase:
         return cls.script_testcase_list[script_type]['cleaned']
 
     @classmethod
-    def pre_condition(cls, script_type):
+    def pre_condition_cls(cls, script_type):
         return dovetail_config[script_type]['pre_condition']
 
-    def post_condition(cls, script_type):
+    def post_condition_cls(cls, script_type):
         return dovetail_config[script_type]['post_condition']
 
-
     @classmethod
-    def update_script_testcase(cls,script_type, script_testcase):
+    def update_script_testcase(cls, script_type, script_testcase):
         if script_testcase not in cls.script_testcase_list[script_type]:
-            cls.script_testcase_list[script_type][script_testcase] = {'retry':0, 'acquired':False}
+            cls.script_testcase_list[script_type][script_testcase] = \
+                {'retry': 0, 'acquired': False}
             cls.script_testcase_list[script_type]['prepared'] = False
             cls.script_testcase_list[script_type]['cleaned'] = False
 
     @classmethod
-    def _exceed_max_retry_times(cls, script_type, script_testcase ):
-        return cls.script_testcase_list[script_type][script_testcase]['retry'] > 1
+    def _exceed_max_retry_times(cls, script_type, script_testcase):
+        retry = cls.script_testcase_list[script_type][script_testcase]['retry']
+        return retry > 1
 
     @classmethod
     def _increase_retry(cls, script_type, script_testcase):
@@ -127,10 +133,11 @@ class Testcase:
         return cls.script_testcase_list[script_type][script_testcase]['retry']
 
     @classmethod
-    def _result_acquired(cls, script_type, script_testcase, acquired=None):
+    def _result_acquired(cls, script_type, testcase, acquired=None):
         if acquired is not None:
-            cls.script_testcase_list[script_type][script_testcase]['acquired'] = acquired
-        return cls.script_testcase_list[script_type][script_testcase]['acquired']
+            cls.script_testcase_list[script_type][testcase]['acquired'] = \
+                acquired
+        return cls.script_testcase_list[script_type][testcase]['acquired']
 
     @classmethod
     def load(cls):
@@ -138,8 +145,9 @@ class Testcase:
             for testcase_file in files:
                 with open(os.path.join(root, testcase_file)) as f:
                     testcase_yaml = yaml.safe_load(f)
-                    cls.testcase_list[testcase_yaml.keys()[0]] = Testcase(testcase_yaml)
-        logger.debug( cls.testcase_list )
+                    cls.testcase_list[testcase_yaml.keys()[0]] = \
+                        Testcase(testcase_yaml)
+        logger.debug(cls.testcase_list)
 
     @classmethod
     def get(cls, testcase_name):
@@ -160,6 +168,7 @@ class Scenario:
         return None
 
     scenario_list = {}
+
     @classmethod
     def load(cls):
         for root, dirs, files in os.walk(CERT_PATH):
@@ -175,4 +184,3 @@ class Scenario:
         if scenario_name in cls.scenario_list:
             return cls.scenario_list[scenario_name]
         return None
-
diff --git a/dovetail/utils/dovetail_logger.py b/dovetail/utils/dovetail_logger.py
index 9b20225c..bd13508d 100644
--- a/dovetail/utils/dovetail_logger.py
+++ b/dovetail/utils/dovetail_logger.py
@@ -24,6 +24,7 @@
 import logging
 import os
 
+
 class Logger:
     def __init__(self, logger_name):
 
@@ -52,4 +53,3 @@ class Logger:
 
     def getLogger(self):
         return self.logger
-
diff --git a/dovetail/utils/dovetail_utils.py b/dovetail/utils/dovetail_utils.py
index 4c671552..2e33b53a 100644
--- a/dovetail/utils/dovetail_utils.py
+++ b/dovetail/utils/dovetail_utils.py
@@ -11,12 +11,11 @@
 
 import sys
 import subprocess
+from collections import Mapping, Set, Sequence
+
 
-def exec_cmd(cmd, logger=None,
-                    exit_on_error=True,
-                    info=False,
-                    error_msg="",
-                    verbose=True):
+def exec_cmd(cmd, logger=None, exit_on_error=True, info=False,
+             error_msg="", verbose=True):
     if not error_msg:
         error_msg = ("The command '%s' failed." % cmd)
     msg_exec = ("Executing command: '%s'" % cmd)
@@ -55,12 +54,16 @@ def exec_cmd(cmd, logger=None,
     return returncode, output[0].strip()
 
 
-#walkthrough the object, yield path and value
-from collections import Mapping, Set, Sequence
+# walkthrough the object, yield path and value
 
 # dual python 2/3 compatability, inspired by the "six" library
 string_types = (str, unicode) if str is bytes else (str, bytes)
-iteritems = lambda mapping: getattr(mapping, 'iteritems', mapping.items)()
+# iteritems = lambda mapping: getattr(mapping, 'iteritems', mapping.items)()
+
+
+def iteritems(mapping):
+    return getattr(mapping, 'iteritems', mapping.items)()
+
 
 def objwalk(obj, path=(), memo=None):
     if memo is None:
@@ -68,7 +71,8 @@ def objwalk(obj, path=(), memo=None):
     iterator = None
     if isinstance(obj, Mapping):
         iterator = iteritems
-    elif isinstance(obj, (Sequence, Set)) and not isinstance(obj, string_types):
+    elif isinstance(obj, (Sequence, Set)) and not isinstance(obj,
+                                                             string_types):
         iterator = enumerate
     if iterator:
         if id(obj) not in memo:
@@ -80,8 +84,8 @@ def objwalk(obj, path=(), memo=None):
     else:
         yield path, obj
 
-def get_obj_by_path(obj,dst_path):
+
+def get_obj_by_path(obj, dst_path):
     for path, obj in objwalk(obj):
         if path == dst_path:
             return obj
-