Fix pylint errors/warnings in tempest modules

JIRA: FUNCTEST-913

Change-Id: I37b25bbcf43fb1d6f7de0c815ad49070d1e1af12
Signed-off-by: Juha Kosonen <juha.kosonen@nokia.com>

2 files changed, 168 insertions, 141 deletions

diff --git a/functest/opnfv_tests/openstack/tempest/conf_utils.py b/functest/opnfv_tests/openstack/tempest/conf_utils.py
index e61ab813..6b35b96e 100644
--- a/functest/opnfv_tests/openstack/tempest/conf_utils.py
+++ b/functest/opnfv_tests/openstack/tempest/conf_utils.py
@@ -7,6 +7,9 @@
 #
 # http://www.apache.org/licenses/LICENSE-2.0
 #
+
+"""Tempest configuration utilities."""
+
 import ConfigParser
 import logging
 import fileinput
@@ -52,31 +55,32 @@ CI_INSTALLER_TYPE = CONST.__getattribute__('INSTALLER_TYPE')
 CI_INSTALLER_IP = CONST.__getattribute__('INSTALLER_IP')
 
 """ logging configuration """
-logger = logging.getLogger(__name__)
+LOGGER = logging.getLogger(__name__)
 
 
 def create_rally_deployment():
+    """Create new rally deployment"""
     # set the architecture to default
     pod_arch = os.getenv("POD_ARCH", None)
     arch_filter = ['aarch64']
 
     if pod_arch and pod_arch in arch_filter:
-        logger.info("Apply aarch64 specific to rally config...")
-        with open(RALLY_AARCH64_PATCH_PATH, "r") as f:
-            rally_patch_conf = f.read()
+        LOGGER.info("Apply aarch64 specific to rally config...")
+        with open(RALLY_AARCH64_PATCH_PATH, "r") as pfile:
+            rally_patch_conf = pfile.read()
 
         for line in fileinput.input(RALLY_CONF_PATH, inplace=1):
             print line,
             if "cirros|testvm" in line:
                 print rally_patch_conf
 
-    logger.info("Creating Rally environment...")
+    LOGGER.info("Creating Rally environment...")
 
     cmd = "rally deployment destroy opnfv-rally"
     ft_utils.execute_command(cmd, error_msg=(
         "Deployment %s does not exist."
         % CONST.__getattribute__('rally_deployment_name')),
-        verbose=False)
+                             verbose=False)
 
     cmd = ("rally deployment create --fromenv --name={0}"
            .format(CONST.__getattribute__('rally_deployment_name')))
@@ -89,13 +93,14 @@ def create_rally_deployment():
 
 
 def create_verifier():
-    logger.info("Create verifier from existing repo...")
+    """Create new verifier"""
+    LOGGER.info("Create verifier from existing repo...")
     cmd = ("rally verify delete-verifier --id '{0}' --force").format(
         CONST.__getattribute__('tempest_verifier_name'))
     ft_utils.execute_command(cmd, error_msg=(
         "Verifier %s does not exist."
         % CONST.__getattribute__('tempest_verifier_name')),
-        verbose=False)
+                             verbose=False)
     cmd = ("rally verify create-verifier --source {0} "
            "--name {1} --type tempest --system-wide"
            .format(CONST.__getattribute__('dir_repo_tempest'),
@@ -113,12 +118,12 @@ def get_verifier_id():
     cmd = ("rally verify list-verifiers | awk '/" +
            CONST.__getattribute__('tempest_verifier_name') +
            "/ {print $2}'")
-    p = subprocess.Popen(cmd, shell=True,
-                         stdout=subprocess.PIPE,
-                         stderr=subprocess.STDOUT)
-    deployment_uuid = p.stdout.readline().rstrip()
+    proc = subprocess.Popen(cmd, shell=True,
+                            stdout=subprocess.PIPE,
+                            stderr=subprocess.STDOUT)
+    deployment_uuid = proc.stdout.readline().rstrip()
     if deployment_uuid == "":
-        logger.error("Tempest verifier not found.")
+        LOGGER.error("Tempest verifier not found.")
         raise Exception('Error with command:%s' % cmd)
     return deployment_uuid
 
@@ -130,12 +135,12 @@ def get_verifier_deployment_id():
     cmd = ("rally deployment list | awk '/" +
            CONST.__getattribute__('rally_deployment_name') +
            "/ {print $2}'")
-    p = subprocess.Popen(cmd, shell=True,
-                         stdout=subprocess.PIPE,
-                         stderr=subprocess.STDOUT)
-    deployment_uuid = p.stdout.readline().rstrip()
+    proc = subprocess.Popen(cmd, shell=True,
+                            stdout=subprocess.PIPE,
+                            stderr=subprocess.STDOUT)
+    deployment_uuid = proc.stdout.readline().rstrip()
     if deployment_uuid == "":
-        logger.error("Rally deployment not found.")
+        LOGGER.error("Rally deployment not found.")
         raise Exception('Error with command:%s' % cmd)
     return deployment_uuid
 
@@ -192,13 +197,14 @@ def configure_tempest(deployment_dir, image_id=None, flavor_id=None,
 
 def configure_tempest_defcore(deployment_dir, image_id, flavor_id,
                               image_id_alt, flavor_id_alt, tenant_id):
+    # pylint: disable=too-many-arguments
     """
     Add/update needed parameters into tempest.conf file
     """
     conf_file = configure_verifier(deployment_dir)
     configure_tempest_update_params(conf_file, image_id, flavor_id)
 
-    logger.debug("Updating selected tempest.conf parameters for defcore...")
+    LOGGER.debug("Updating selected tempest.conf parameters for defcore...")
     config = ConfigParser.RawConfigParser()
     config.read(conf_file)
     config.set('DEFAULT', 'log_file', '{}/tempest.log'.format(deployment_dir))
@@ -227,7 +233,7 @@ def generate_test_accounts_file(tenant_id):
     Add needed tenant and user params into test_accounts.yaml
     """
 
-    logger.debug("Add needed params into test_accounts.yaml...")
+    LOGGER.debug("Add needed params into test_accounts.yaml...")
     accounts_list = [
         {
             'tenant_name':
@@ -239,8 +245,25 @@ def generate_test_accounts_file(tenant_id):
         }
     ]
 
-    with open(TEST_ACCOUNTS_FILE, "w") as f:
-        yaml.dump(accounts_list, f, default_flow_style=False)
+    with open(TEST_ACCOUNTS_FILE, "w") as tfile:
+        yaml.dump(accounts_list, tfile, default_flow_style=False)
+
+
+def update_tempest_conf_file(conf_file, config):
+    """Update defined paramters into tempest config file"""
+    with open(TEMPEST_CONF_YAML) as yfile:
+        conf_yaml = yaml.safe_load(yfile)
+    if conf_yaml:
+        sections = config.sections()
+        for section in conf_yaml:
+            if section not in sections:
+                config.add_section(section)
+            sub_conf = conf_yaml.get(section)
+            for key, value in sub_conf.items():
+                config.set(section, key, value)
+
+    with open(conf_file, 'wb') as config_file:
+        config.write(config_file)
 
 
 def configure_tempest_update_params(tempest_conf_file, image_id=None,
@@ -248,7 +271,7 @@ def configure_tempest_update_params(tempest_conf_file, image_id=None,
     """
     Add/update needed parameters into tempest.conf file
     """
-    logger.debug("Updating selected tempest.conf parameters...")
+    LOGGER.debug("Updating selected tempest.conf parameters...")
     config = ConfigParser.RawConfigParser()
     config.read(tempest_conf_file)
     config.set(
@@ -276,8 +299,9 @@ def configure_tempest_update_params(tempest_conf_file, image_id=None,
                CONST.__getattribute__('OS_REGION_NAME'))
     identity_api_version = os.getenv(
         "OS_IDENTITY_API_VERSION", os.getenv("IDENTITY_API_VERSION"))
-    if (identity_api_version == '3'):
+    if identity_api_version == '3':
         auth_version = 'v3'
+        config.set('identity-feature-enabled', 'api_v2', False)
     else:
         auth_version = 'v2'
     config.set('identity', 'auth_version', auth_version)
@@ -291,9 +315,6 @@ def configure_tempest_update_params(tempest_conf_file, image_id=None,
         config.set('identity', 'v3_endpoint_type',
                    CONST.__getattribute__('OS_ENDPOINT_TYPE'))
 
-    if (identity_api_version == '3'):
-        config.set('identity-feature-enabled', 'api_v2', False)
-
     if CONST.__getattribute__('OS_ENDPOINT_TYPE') is not None:
         sections = config.sections()
         services_list = ['compute',
@@ -309,21 +330,9 @@ def configure_tempest_update_params(tempest_conf_file, image_id=None,
             config.set(service, 'endpoint_type',
                        CONST.__getattribute__('OS_ENDPOINT_TYPE'))
 
-    logger.debug('Add/Update required params defined in tempest_conf.yaml '
+    LOGGER.debug('Add/Update required params defined in tempest_conf.yaml '
                  'into tempest.conf file')
-    with open(TEMPEST_CONF_YAML) as f:
-        conf_yaml = yaml.safe_load(f)
-    if conf_yaml:
-        sections = config.sections()
-        for section in conf_yaml:
-            if section not in sections:
-                config.add_section(section)
-            sub_conf = conf_yaml.get(section)
-            for key, value in sub_conf.items():
-                config.set(section, key, value)
-
-    with open(tempest_conf_file, 'wb') as config_file:
-        config.write(config_file)
+    update_tempest_conf_file(tempest_conf_file, config)
 
     backup_tempest_config(tempest_conf_file)
 
@@ -334,18 +343,18 @@ def configure_verifier(deployment_dir):
     """
     tempest_conf_file = os.path.join(deployment_dir, "tempest.conf")
     if os.path.isfile(tempest_conf_file):
-        logger.debug("Verifier is already configured.")
-        logger.debug("Reconfiguring the current verifier...")
+        LOGGER.debug("Verifier is already configured.")
+        LOGGER.debug("Reconfiguring the current verifier...")
         cmd = "rally verify configure-verifier --reconfigure"
     else:
-        logger.info("Configuring the verifier...")
+        LOGGER.info("Configuring the verifier...")
         cmd = "rally verify configure-verifier"
     ft_utils.execute_command(cmd)
 
-    logger.debug("Looking for tempest.conf file...")
+    LOGGER.debug("Looking for tempest.conf file...")
     if not os.path.isfile(tempest_conf_file):
-        logger.error("Tempest configuration file %s NOT found."
-                     % tempest_conf_file)
+        LOGGER.error("Tempest configuration file %s NOT found.",
+                     tempest_conf_file)
         raise Exception("Tempest configuration file %s NOT found."
                         % tempest_conf_file)
     else:
diff --git a/functest/opnfv_tests/openstack/tempest/tempest.py b/functest/opnfv_tests/openstack/tempest/tempest.py
index e75192b9..c5ad4ecb 100644
--- a/functest/opnfv_tests/openstack/tempest/tempest.py
+++ b/functest/opnfv_tests/openstack/tempest/tempest.py
@@ -8,6 +8,8 @@
 # http://www.apache.org/licenses/LICENSE-2.0
 #
 
+"""Tempest testcases implementation."""
+
 from __future__ import division
 
 import logging
@@ -37,36 +39,68 @@ from snaps.openstack.tests import openstack_tests
 from snaps.openstack.utils import deploy_utils
 
 
-""" logging configuration """
-logger = logging.getLogger(__name__)
+LOGGER = logging.getLogger(__name__)
 
 
 class TempestCommon(testcase.TestCase):
+    # pylint: disable=too-many-instance-attributes
+    """TempestCommon testcases implementation class."""
 
     def __init__(self, **kwargs):
         super(TempestCommon, self).__init__(**kwargs)
         self.resources = TempestResourcesManager(**kwargs)
-        self.MODE = ""
-        self.OPTION = []
-        self.VERIFIER_ID = conf_utils.get_verifier_id()
-        self.VERIFIER_REPO_DIR = conf_utils.get_verifier_repo_dir(
-            self.VERIFIER_ID)
-        self.DEPLOYMENT_ID = conf_utils.get_verifier_deployment_id()
-        self.DEPLOYMENT_DIR = conf_utils.get_verifier_deployment_dir(
-            self.VERIFIER_ID, self.DEPLOYMENT_ID)
-        self.VERIFICATION_ID = None
+        self.mode = ""
+        self.option = []
+        self.verifier_id = conf_utils.get_verifier_id()
+        self.verifier_repo_dir = conf_utils.get_verifier_repo_dir(
+            self.verifier_id)
+        self.deployment_id = conf_utils.get_verifier_deployment_id()
+        self.deployment_dir = conf_utils.get_verifier_deployment_dir(
+            self.verifier_id, self.deployment_id)
+        self.verification_id = None
 
     @staticmethod
     def read_file(filename):
+        """Read file and return content as a stripped list."""
         with open(filename) as src:
             return [line.strip() for line in src.readlines()]
 
+    @staticmethod
+    def get_verifier_result(verif_id):
+        """Retrieve verification results."""
+        result = {
+            'num_tests': 0,
+            'num_success': 0,
+            'num_failures': 0,
+            'num_skipped': 0
+        }
+        cmd = ["rally", "verify", "show", "--uuid", verif_id]
+        LOGGER.info("Showing result for a verification: '%s'.", cmd)
+        proc = subprocess.Popen(cmd,
+                                stdout=subprocess.PIPE,
+                                stderr=subprocess.STDOUT)
+        for line in proc.stdout:
+            new_line = line.replace(' ', '').split('|')
+            if 'Tests' in new_line:
+                break
+            LOGGER.info(line)
+            if 'Testscount' in new_line:
+                result['num_tests'] = int(new_line[2])
+            elif 'Success' in new_line:
+                result['num_success'] = int(new_line[2])
+            elif 'Skipped' in new_line:
+                result['num_skipped'] = int(new_line[2])
+            elif 'Failures' in new_line:
+                result['num_failures'] = int(new_line[2])
+        return result
+
     def generate_test_list(self, verifier_repo_dir):
-        logger.debug("Generating test case list...")
-        if self.MODE == 'defcore':
+        """Generate test list based on the test mode."""
+        LOGGER.debug("Generating test case list...")
+        if self.mode == 'defcore':
             shutil.copyfile(
                 conf_utils.TEMPEST_DEFCORE, conf_utils.TEMPEST_RAW_LIST)
-        elif self.MODE == 'custom':
+        elif self.mode == 'custom':
             if os.path.isfile(conf_utils.TEMPEST_CUSTOM):
                 shutil.copyfile(
                     conf_utils.TEMPEST_CUSTOM, conf_utils.TEMPEST_RAW_LIST)
@@ -74,12 +108,12 @@ class TempestCommon(testcase.TestCase):
                 raise Exception("Tempest test list file %s NOT found."
                                 % conf_utils.TEMPEST_CUSTOM)
         else:
-            if self.MODE == 'smoke':
+            if self.mode == 'smoke':
                 testr_mode = "smoke"
-            elif self.MODE == 'full':
+            elif self.mode == 'full':
                 testr_mode = ""
             else:
-                testr_mode = 'tempest.api.' + self.MODE
+                testr_mode = 'tempest.api.' + self.mode
             cmd = ("cd {0};"
                    "testr list-tests {1} > {2};"
                    "cd -;".format(verifier_repo_dir,
@@ -88,14 +122,15 @@ class TempestCommon(testcase.TestCase):
             ft_utils.execute_command(cmd)
 
     def apply_tempest_blacklist(self):
-        logger.debug("Applying tempest blacklist...")
+        """Exclude blacklisted test cases."""
+        LOGGER.debug("Applying tempest blacklist...")
         cases_file = self.read_file(conf_utils.TEMPEST_RAW_LIST)
         result_file = open(conf_utils.TEMPEST_LIST, 'w')
         black_tests = []
         try:
             installer_type = CONST.__getattribute__('INSTALLER_TYPE')
             deploy_scenario = CONST.__getattribute__('DEPLOY_SCENARIO')
-            if (bool(installer_type) * bool(deploy_scenario)):
+            if bool(installer_type) * bool(deploy_scenario):
                 # if INSTALLER_TYPE and DEPLOY_SCENARIO are set we read the
                 # file
                 black_list_file = open(conf_utils.TEMPEST_BLACKLIST)
@@ -110,9 +145,9 @@ class TempestCommon(testcase.TestCase):
                         for test in tests:
                             black_tests.append(test)
                         break
-        except Exception:
+        except Exception:  # pylint: disable=broad-except
             black_tests = []
-            logger.debug("Tempest blacklist file does not exist.")
+            LOGGER.debug("Tempest blacklist file does not exist.")
 
         for cases_line in cases_file:
             for black_tests_line in black_tests:
@@ -123,10 +158,11 @@ class TempestCommon(testcase.TestCase):
         result_file.close()
 
     def run_verifier_tests(self):
+        """Execute tempest test cases."""
         cmd = ["rally", "verify", "start", "--load-list",
                conf_utils.TEMPEST_LIST]
-        cmd.extend(self.OPTION)
-        logger.info("Starting Tempest test suite: '%s'." % cmd)
+        cmd.extend(self.option)
+        LOGGER.info("Starting Tempest test suite: '%s'.", cmd)
 
         header = ("Tempest environment:\n"
                   "  SUT: %s\n  Scenario: %s\n  Node: %s\n  Date: %s\n" %
@@ -144,63 +180,45 @@ class TempestCommon(testcase.TestCase):
                                   "environment.log"), 'w+')
         f_env.write(header)
 
-        p = subprocess.Popen(
+        proc = subprocess.Popen(
             cmd,
             stdout=subprocess.PIPE,
             stderr=f_stderr,
             bufsize=1)
 
-        with p.stdout:
-            for line in iter(p.stdout.readline, b''):
-                if re.search("\} tempest\.", line):
-                    logger.info(line.replace('\n', ''))
+        with proc.stdout:
+            for line in iter(proc.stdout.readline, b''):
+                if re.search(r"\} tempest\.", line):
+                    LOGGER.info(line.replace('\n', ''))
                 elif re.search('Starting verification', line):
-                    logger.info(line.replace('\n', ''))
+                    LOGGER.info(line.replace('\n', ''))
                     first_pos = line.index("UUID=") + len("UUID=")
                     last_pos = line.index(") for deployment")
-                    self.VERIFICATION_ID = line[first_pos:last_pos]
-                    logger.debug('Verification UUID: %s', self.VERIFICATION_ID)
+                    self.verification_id = line[first_pos:last_pos]
+                    LOGGER.debug('Verification UUID: %s', self.verification_id)
                 f_stdout.write(line)
-        p.wait()
+        proc.wait()
 
         f_stdout.close()
         f_stderr.close()
         f_env.close()
 
     def parse_verifier_result(self):
-        if self.VERIFICATION_ID is None:
+        """Parse and save test results."""
+        if self.verification_id is None:
             raise Exception('Verification UUID not found')
 
-        cmd = ["rally", "verify", "show", "--uuid", self.VERIFICATION_ID]
-        logger.info("Showing result for a verification: '%s'." % cmd)
-        p = subprocess.Popen(cmd,
-                             stdout=subprocess.PIPE,
-                             stderr=subprocess.STDOUT)
-        for line in p.stdout:
-            new_line = line.replace(' ', '').split('|')
-            if 'Tests' in new_line:
-                break
-
-            logger.info(line)
-            if 'Testscount' in new_line:
-                num_tests = new_line[2]
-            elif 'Success' in new_line:
-                num_success = new_line[2]
-            elif 'Skipped' in new_line:
-                num_skipped = new_line[2]
-            elif 'Failures' in new_line:
-                num_failures = new_line[2]
-
+        stat = self.get_verifier_result(self.verification_id)
         try:
-            num_executed = int(num_tests) - int(num_skipped)
+            num_executed = stat['num_tests'] - stat['num_skipped']
             try:
-                self.result = 100 * int(num_success) / int(num_executed)
+                self.result = 100 * stat['num_success'] / num_executed
             except ZeroDivisionError:
                 self.result = 0
-                if int(num_tests) > 0:
-                    logger.info("All tests have been skipped")
+                if stat['num_tests'] > 0:
+                    LOGGER.info("All tests have been skipped")
                 else:
-                    logger.error("No test has been executed")
+                    LOGGER.error("No test has been executed")
                     return
 
             with open(os.path.join(conf_utils.TEMPEST_RESULTS_DIR,
@@ -208,25 +226,25 @@ class TempestCommon(testcase.TestCase):
                 output = logfile.read()
 
             success_testcases = []
-            for match in re.findall('.*\{0\} (.*?)[. ]*success ', output):
+            for match in re.findall(r'.*\{0\} (.*?)[. ]*success ', output):
                 success_testcases.append(match)
             failed_testcases = []
-            for match in re.findall('.*\{0\} (.*?)[. ]*fail ', output):
+            for match in re.findall(r'.*\{0\} (.*?)[. ]*fail ', output):
                 failed_testcases.append(match)
             skipped_testcases = []
-            for match in re.findall('.*\{0\} (.*?)[. ]*skip:', output):
+            for match in re.findall(r'.*\{0\} (.*?)[. ]*skip:', output):
                 skipped_testcases.append(match)
 
-            self.details = {"tests": int(num_tests),
-                            "failures": int(num_failures),
+            self.details = {"tests": stat['num_tests'],
+                            "failures": stat['num_failures'],
                             "success": success_testcases,
-                            "errors": failed_testcases,
-                            "skipped": skipped_testcases}
-        except Exception:
+                            "skipped": skipped_testcases,
+                            "errors": failed_testcases}
+        except Exception:  # pylint: disable=broad-except
             self.result = 0
 
-        logger.info("Tempest %s success_rate is %s%%"
-                    % (self.case_name, self.result))
+        LOGGER.info("Tempest %s success_rate is %s%%",
+                    self.case_name, self.result)
 
     def run(self):
 
@@ -238,17 +256,17 @@ class TempestCommon(testcase.TestCase):
             compute_cnt = snaps_utils.get_active_compute_cnt(
                 self.resources.os_creds)
             conf_utils.configure_tempest(
-                self.DEPLOYMENT_DIR,
+                self.deployment_dir,
                 image_id=resources.get("image_id"),
                 flavor_id=resources.get("flavor_id"),
                 compute_cnt=compute_cnt)
-            self.generate_test_list(self.VERIFIER_REPO_DIR)
+            self.generate_test_list(self.verifier_repo_dir)
             self.apply_tempest_blacklist()
             self.run_verifier_tests()
             self.parse_verifier_result()
             res = testcase.TestCase.EX_OK
-        except Exception as e:
-            logger.error('Error with run: %s' % e)
+        except Exception as err:  # pylint: disable=broad-except
+            LOGGER.error('Error with run: %s', err)
             res = testcase.TestCase.EX_RUN_ERROR
         finally:
             self.resources.cleanup()
@@ -258,55 +276,55 @@ class TempestCommon(testcase.TestCase):
 
 
 class TempestSmokeSerial(TempestCommon):
-
+    """Tempest smoke serial testcase implementation."""
     def __init__(self, **kwargs):
         if "case_name" not in kwargs:
             kwargs["case_name"] = 'tempest_smoke_serial'
         TempestCommon.__init__(self, **kwargs)
-        self.MODE = "smoke"
-        self.OPTION = ["--concurrency", "1"]
+        self.mode = "smoke"
+        self.option = ["--concurrency", "1"]
 
 
 class TempestSmokeParallel(TempestCommon):
-
+    """Tempest smoke parallel testcase implementation."""
     def __init__(self, **kwargs):
         if "case_name" not in kwargs:
             kwargs["case_name"] = 'tempest_smoke_parallel'
         TempestCommon.__init__(self, **kwargs)
-        self.MODE = "smoke"
+        self.mode = "smoke"
 
 
 class TempestFullParallel(TempestCommon):
-
+    """Tempest full parallel testcase implementation."""
     def __init__(self, **kwargs):
         if "case_name" not in kwargs:
             kwargs["case_name"] = 'tempest_full_parallel'
         TempestCommon.__init__(self, **kwargs)
-        self.MODE = "full"
+        self.mode = "full"
 
 
 class TempestCustom(TempestCommon):
-
+    """Tempest custom testcase implementation."""
     def __init__(self, **kwargs):
         if "case_name" not in kwargs:
             kwargs["case_name"] = 'tempest_custom'
         TempestCommon.__init__(self, **kwargs)
-        self.MODE = "custom"
-        self.OPTION = ["--concurrency", "1"]
+        self.mode = "custom"
+        self.option = ["--concurrency", "1"]
 
 
 class TempestDefcore(TempestCommon):
-
+    """Tempest Defcore testcase implementation."""
     def __init__(self, **kwargs):
         if "case_name" not in kwargs:
             kwargs["case_name"] = 'tempest_defcore'
         TempestCommon.__init__(self, **kwargs)
-        self.MODE = "defcore"
-        self.OPTION = ["--concurrency", "1"]
+        self.mode = "defcore"
+        self.option = ["--concurrency", "1"]
 
 
 class TempestResourcesManager(object):
-
+    """Tempest resource manager."""
     def __init__(self, **kwargs):
         self.os_creds = kwargs.get('os_creds') or snaps_utils.get_credentials()
         self.guid = '-' + str(uuid.uuid4())
@@ -423,34 +441,34 @@ class TempestResourcesManager(object):
         project_name = None
 
         if create_project:
-            logger.debug("Creating project and user for Tempest suite")
+            LOGGER.debug("Creating project and user for Tempest suite")
             project_name = CONST.__getattribute__(
                 'tempest_identity_tenant_name') + self.guid
             result['project_id'] = self._create_project()
             result['user_id'] = self._create_user()
             result['tenant_id'] = result['project_id']  # for compatibility
 
-        logger.debug("Creating private network for Tempest suite")
+        LOGGER.debug("Creating private network for Tempest suite")
         self._create_network(project_name)
 
-        logger.debug("Creating image for Tempest suite")
+        LOGGER.debug("Creating image for Tempest suite")
         image_name = CONST.__getattribute__('openstack_image_name') + self.guid
         result['image_id'] = self._create_image(image_name)
 
         if use_custom_images:
-            logger.debug("Creating 2nd image for Tempest suite")
+            LOGGER.debug("Creating 2nd image for Tempest suite")
             image_name = CONST.__getattribute__(
                 'openstack_image_name_alt') + self.guid
             result['image_id_alt'] = self._create_image(image_name)
 
         if (CONST.__getattribute__('tempest_use_custom_flavors') == 'True' or
                 use_custom_flavors):
-            logger.info("Creating flavor for Tempest suite")
+            LOGGER.info("Creating flavor for Tempest suite")
             name = CONST.__getattribute__('openstack_flavor_name') + self.guid
             result['flavor_id'] = self._create_flavor(name)
 
         if use_custom_flavors:
-            logger.info("Creating 2nd flavor for Tempest suite")
+            LOGGER.info("Creating 2nd flavor for Tempest suite")
             scenario = CONST.__getattribute__('DEPLOY_SCENARIO')
             if 'ovs' in scenario or 'fdio' in scenario:
                 CONST.__setattr__('openstack_flavor_ram', 1024)
@@ -467,5 +485,5 @@ class TempestResourcesManager(object):
         for creator in reversed(self.creators):
             try:
                 creator.clean()
-            except Exception as e:
-                logger.error('Unexpected error cleaning - %s', e)
+            except Exception as err:  # pylint: disable=broad-except
+                LOGGER.error('Unexpected error cleaning - %s', err)