diff --git a/fuelweb_test/helpers/checkers.py b/fuelweb_test/helpers/checkers.py
index 90cd57c5e..cc5254b1f 100644
--- a/fuelweb_test/helpers/checkers.py
+++ b/fuelweb_test/helpers/checkers.py
@@ -508,7 +508,7 @@ def check_stats_on_collector(collector_remote, postgres_actions, master_uuid):
 
     # Check that important data (clusters number, nodes number, nodes roles,
     # user's email, used operation system, OpenStack stats) is saved correctly
-    for stat_type in general_stats.keys():
+    for stat_type in general_stats:
         assert_true(
             isinstance(summ_stats[stat_type], general_stats[stat_type]),
             "Installation structure in Collector's DB doesn't contain"
@@ -568,7 +568,7 @@ def check_stats_private_info(collector_remote, postgres_actions,
         _has_private_data = False
         # Check that stats doesn't contain private data (e.g.
         # specific passwords, settings, emails)
-        for _private in private_data.keys():
+        for _private in private_data:
             _regex = r'(?P<key>"\S+"): (?P<value>[^:]*"{0}"[^:]*)'.format(
                 private_data[_private])
             for _match in re.finditer(_regex, data):
@@ -584,7 +584,7 @@ def check_stats_private_info(collector_remote, postgres_actions,
                 _has_private_data = True
         # Check that stats doesn't contain private types of data (e.g. any kind
         # of passwords)
-        for _data_type in secret_data_types.keys():
+        for _data_type in secret_data_types:
             _regex = (r'(?P<secret>"[^"]*{0}[^"]*": (\{{[^\}}]+\}}|\[[^\]+]\]|'
                       r'"[^"]+"))').format(secret_data_types[_data_type])
 
diff --git a/fuelweb_test/helpers/patching.py b/fuelweb_test/helpers/patching.py
index bc8e3e585..62e7b2b6b 100644
--- a/fuelweb_test/helpers/patching.py
+++ b/fuelweb_test/helpers/patching.py
@@ -396,7 +396,7 @@ def get_slaves_ids_by_role(slaves, role=None):
 
 def verify_fix_apply_step(apply_step):
     validation_schema = patching_validation_schema
-    for key in validation_schema.keys():
+    for key in validation_schema:
         if key in apply_step.keys():
             is_exists = apply_step[key] is not None
         else:
diff --git a/fuelweb_test/testrail/generate_failure_group_statistics.py b/fuelweb_test/testrail/generate_failure_group_statistics.py
index 451d42394..57cf710b0 100644
--- a/fuelweb_test/testrail/generate_failure_group_statistics.py
+++ b/fuelweb_test/testrail/generate_failure_group_statistics.py
@@ -440,7 +440,8 @@ def get_global_failure_group_list(
                 failure_group_dict[key] = []
             failure_group_dict[key].append(failure)
     # let's find Levenshtein distance and update failure_group_dict
-    for num1, key1 in enumerate(failure_group_dict.keys()):
+    for num1, key1 in enumerate(failure_group_dict):
+        # pylint: disable=C0201
         for key2 in failure_group_dict.keys()[num1 + 1:]:
             # let's skip grouping if len are different more 10%
             if key1 == key2 or abs(float(len(key1) / len(key2))) >\
diff --git a/fuelweb_test/testrail/report.py b/fuelweb_test/testrail/report.py
index f3142f721..90a075b5d 100755
--- a/fuelweb_test/testrail/report.py
+++ b/fuelweb_test/testrail/report.py
@@ -73,7 +73,7 @@ class TestResult(object):
 
     @property
     def status(self):
-        for s in self.available_statuses.keys():
+        for s in self.available_statuses:
             if self._status in self.available_statuses[s]:
                 return s
         logger.error('Unsupported result status: "{0}"!'.format(self._status))