diff --git a/exchanger/engine.py b/exchanger/engine.py
index 0351ae3..a48a068 100644
--- a/exchanger/engine.py
+++ b/exchanger/engine.py
@@ -247,9 +247,8 @@ def _extract_email(self, msg: Dict[str, Any]) -> str:
         """
         headers = msg['payload']['headers']
         sender = next(x for x in headers if x['name'] == 'From')['value']
-        match = re.search('.*<(?P<email>.*)>.*', sender)
-        if match:
-            sender = match.group('email')
+        if match := re.search('.*<(?P<email>.*)>.*', sender):
+            sender = match['email']
         logger.debug(f'Sender email "{sender}" was extracted '
                      f'from the message with id "{msg["id"]}".')
         return sender
@@ -265,10 +264,10 @@ def _extract_lesson_name(self, msg: Dict[str, Any]) -> str:
         """
         headers = msg['payload']['headers']
         subject = next(x for x in headers if x['name'] == 'Subject')['value']
-        match = re.search('^(?P<label>.*)/(?P<lesson>.*)$', subject)
-        les_name = ''
-        if match:
-            les_name = match.group('lesson')
+        if match := re.search('^(?P<label>.*)/(?P<lesson>.*)$', subject):
+            les_name = match['lesson']
+        else:
+            les_name = ''
         logger.debug(f'Lesson name "{les_name}" extracted '
                      f'from the message with id "{msg["id"]}".')
         return les_name
@@ -381,18 +380,21 @@ def _get_label_id(self, label_name: str) -> str:
         :return: label id.
         """
         all_labels = self._gmail.users().labels().list(userId='me').execute()
-        label_info = {}
-        for label in all_labels['labels']:
-            if label['name'] == label_name:
-                label_info = label
-                break
+        label_info = next(
+            (
+                label
+                for label in all_labels['labels']
+                if label['name'] == label_name
+            ),
+            {},
+        )
         if label_info:
             logger.debug(f'Gmail label "{label_info}" already exists.')
         else:
             body = {'name': label_name, 'messageListVisibility': 'show',
                     'labelListVisibility': 'labelShow'}
             label_info = self._gmail.users().labels() \
-                .create(userId='me', body=body).execute()
+                    .create(userId='me', body=body).execute()
             logger.debug(f'New label "{label_info}" was created.')
         return label_info['id']
 
@@ -408,23 +410,24 @@ def _create_filter(self, label_id: str, fetch_keyword: str,
         """
         # List all filters
         filters = self._gmail.users().settings().filters() \
-            .list(userId='me').execute()
+                .list(userId='me').execute()
 
         # Find if already exist
         criteria = {'to': fetch_alias, 'subject': fetch_keyword}
         action = {'addLabelIds': [label_id],
                   'removeLabelIds': ['INBOX', 'SPAM']}
-        filter_info = {}
-        for gmail_filter in filters['filter']:
-            if (gmail_filter['criteria'] == criteria) \
-                    and (gmail_filter['action'] == action):
-                filter_info = gmail_filter
-                break
-
-        if filter_info:
+        if filter_info := next(
+            (
+                gmail_filter
+                for gmail_filter in filters['filter']
+                if (gmail_filter['criteria'] == criteria)
+                and (gmail_filter['action'] == action)
+            ),
+            {},
+        ):
             logger.debug(f'Filter {filter_info} already exists.')
         else:
             body = {'criteria': criteria, 'action': action}
             self._gmail.users().settings().filters() \
-                .create(userId='me', body=body).execute()
+                    .create(userId='me', body=body).execute()
             logger.debug(f'Filter {filter_info} has been created.')
diff --git a/exchanger/feedback.py b/exchanger/feedback.py
index acb0643..945e942 100644
--- a/exchanger/feedback.py
+++ b/exchanger/feedback.py
@@ -75,9 +75,9 @@ def _get_success_feedback(self, grade_result: GradeResult) -> (str, str):
         """
         timestamp = grade_result.timestamp.strftime(DATE_FORMAT)
         subject = f'{self._course_name} / {grade_result.lesson_name} ' \
-                  f'/ {timestamp}'
-        score = sum([task.score for task in grade_result.task_grades])
-        max_score = sum([task.max_score for task in grade_result.task_grades])
+                      f'/ {timestamp}'
+        score = sum(task.score for task in grade_result.task_grades)
+        max_score = sum(task.max_score for task in grade_result.task_grades)
         body = self._grades_body.format(
             first_name=grade_result.first_name,
             lesson_name=grade_result.lesson_name,
diff --git a/grader/database.py b/grader/database.py
index d055f12..c956e9f 100644
--- a/grader/database.py
+++ b/grader/database.py
@@ -68,10 +68,10 @@ def get_lesson_info(self, lesson_name: str) -> Dict[str, Any]:
             les_tab = self._meta.tables['assignment']
             q_filter = func.lower(les_tab.c.name) == lesson_name.lower()
             lesson_sql = select(['*']).where(q_filter)
-            result = connection.execute(lesson_sql).first()
-            les_info = {}
-            if result:
+            if result := connection.execute(lesson_sql).first():
                 les_info = dict(result)
+            else:
+                les_info = {}
             logger.debug(f'The following information about lesson with '
                          f'name "{lesson_name}" was loaded: {les_info}.')
             return les_info
@@ -87,10 +87,10 @@ def get_user_info(self, email: str) -> Dict[str, Any]:
             users_table = self._meta.tables['student']
             q_filter = func.lower(users_table.c.email) == email.lower()
             user_sql = select(['*']).where(q_filter)
-            result = connection.execute(user_sql).first()
-            user_info = {}
-            if result:
+            if result := connection.execute(user_sql).first():
                 user_info = dict(result)
+            else:
+                user_info = {}
             logger.debug(f'The following information about user with '
                          f'email "{email}" was loaded: {user_info}.')
             return user_info
diff --git a/grader/engine.py b/grader/engine.py
index e524eb4..fd61aec 100644
--- a/grader/engine.py
+++ b/grader/engine.py
@@ -225,10 +225,11 @@ def _is_notebook_valid(self, path: str, lesson_name: str) -> bool:
                 all_cells = json.load(file).get('cells', [])
 
             # Get only nbgrader cells
-            for cell in all_cells:
-                if 'nbgrader' in cell['metadata'].keys():
-                    nb_cells.append(
-                        cell['metadata']['nbgrader'].get('grade_id'))
+            nb_cells.extend(
+                cell['metadata']['nbgrader'].get('grade_id')
+                for cell in all_cells
+                if 'nbgrader' in cell['metadata'].keys()
+            )
         except (JSONDecodeError, UnicodeDecodeError):
             logger.debug(f'File "{path}" does not have a json structure.')
             return False
@@ -236,7 +237,7 @@ def _is_notebook_valid(self, path: str, lesson_name: str) -> bool:
         # Get valid cells
         with self._nb_grader.gradebook as gb:
             origin_cells = gb.find_notebook(lesson_name, lesson_name) \
-                .source_cells
+                    .source_cells
         true_cells = [cell.name for cell in origin_cells]
         return Counter(nb_cells) == Counter(true_cells)
 
@@ -306,20 +307,17 @@ def _get_lesson_tasks(self, lesson_name: str) -> List[Task]:
         tasks = []
         task = None
         for cell in notebook['cells']:
-            nb_data = cell['metadata'].get('nbgrader')
-            if nb_data:
+            if nb_data := cell['metadata'].get('nbgrader'):
                 # If it is a task name cell
                 if cell['cell_type'] == 'markdown':
-                    is_todo = re.match(pat, cell['source'][0])
-                    if is_todo:
-                        task = Task(name=is_todo.group('name'))
+                    if is_todo := re.match(pat, cell['source'][0]):
+                        task = Task(name=is_todo['name'])
                     continue
 
                 # If it is a test cell
-                if cell['cell_type'] == 'code':
-                    if nb_data['grade']:
-                        task.test_cell = nb_data['grade_id']
-                        tasks.append(task)
+                if cell['cell_type'] == 'code' and nb_data['grade']:
+                    task.test_cell = nb_data['grade_id']
+                    tasks.append(task)
         logger.debug(f'Task names were extracted for lesson "{lesson_name}".')
         return tasks
 
diff --git a/publisher/engine.py b/publisher/engine.py
index 368118e..e21df83 100644
--- a/publisher/engine.py
+++ b/publisher/engine.py
@@ -40,13 +40,13 @@ def connect(self) -> None:
 
         # Get id of cloud folder
         query = f"mimeType = 'application/vnd.google-apps.folder' " \
-                f"and name = '{self.cloud_root_name}' " \
-                f"and trashed != True"
-        cloud_file_id = self._find_cloud_files(query, attributes=['id'])
-        if not cloud_file_id:
+                    f"and name = '{self.cloud_root_name}' " \
+                    f"and trashed != True"
+        if cloud_file_id := self._find_cloud_files(query, attributes=['id']):
+            self._cloud_root_id = cloud_file_id[0]['id']
+        else:
             raise ValueError('The root cloud folder for publishing must be '
                              'pre created.')
-        self._cloud_root_id = cloud_file_id[0]['id']
 
     def _create_cloud_path(self, cloud_path: str) -> str:
         """Create all intermediate folders on the way to the cloud path.
@@ -60,12 +60,13 @@ def _create_cloud_path(self, cloud_path: str) -> str:
             return parent_id
         for name in cloud_path.split(os.sep):
             query = f"name = '{name}' and '{parent_id}' in parents " \
-                    f"and trashed != True"
+                        f"and trashed != True"
             folder = self._find_cloud_files(query, ['id'])
-            if not folder:
-                parent_id = self._create_cloud_folder(name, parent_id)
-            else:
-                parent_id = folder[0]['id']
+            parent_id = (
+                folder[0]['id']
+                if folder
+                else self._create_cloud_folder(name, parent_id)
+            )
         return parent_id
 
     def sync(self, local_file: str, cloud_folder_path: str = '.',
@@ -96,17 +97,16 @@ def sync(self, local_file: str, cloud_folder_path: str = '.',
 
         # Find the file and sync it
         query = f"name = '{local_name}' and '{parent_id}' in parents " \
-                f"and trashed != True"
-        cloud_file = self._find_cloud_files(query, ['id'])
-        if not cloud_file:
-            logger.debug(f'File or folder "{local_name}" does not exist '
-                         f'in the cloud path "{cloud_folder_path}".')
-            cloud_file_id = self._upload_file(local_file, parent_id)
-        else:
+                    f"and trashed != True"
+        if cloud_file := self._find_cloud_files(query, ['id']):
             cloud_file_id = cloud_file[0]['id']
             logger.debug(f'File or folder "{local_name}" exists '
                          f'in the cloud path "{cloud_folder_path}".')
             self._update_cloud_file(cloud_file_id, local_file)
+        else:
+            logger.debug(f'File or folder "{local_name}" does not exist '
+                         f'in the cloud path "{cloud_folder_path}".')
+            cloud_file_id = self._upload_file(local_file, parent_id)
         logger.debug(f'Content of the local object "{local_file}" was '
                      f'synchronized with the cloud file "{cloud_name}".')
 
@@ -115,15 +115,15 @@ def sync(self, local_file: str, cloud_folder_path: str = '.',
             file_params = self._get_cloud_file(
                 cloud_file_id, ['permissions', 'name'])
             file_params[link_type] = f'http://drive.google.com/' \
-                                     f'thumbnail?id={cloud_file_id}'
+                                         f'thumbnail?id={cloud_file_id}'
         else:
             file_params = self._get_cloud_file(
                 cloud_file_id, ['permissions', link_type, 'name'])
         if to_share:
-            is_shared = False
-            for p in file_params['permissions']:
-                if (p['id'] == 'anyoneWithLink') and (p['role'] == 'reader'):
-                    is_shared = True
+            is_shared = any(
+                (p['id'] == 'anyoneWithLink') and (p['role'] == 'reader')
+                for p in file_params['permissions']
+            )
             if is_shared:
                 logger.debug(f'File or folder "{file_params["name"]}" with '
                              f'id "{cloud_file_id}" is already shared.')
@@ -297,8 +297,7 @@ def _find_cloud_files(self, query: str, attributes: Iterable[str]) \
             results['files'] += next_page['files']
         return results['files']
 
-    def _get_cloud_file(self, file_id: str, attributes: Iterable[str]) \
-            -> Dict[str, Any]:
+    def _get_cloud_file(self, file_id: str, attributes: Iterable[str]) -> Dict[str, Any]:
         """Get attributes of cloud file.
 
         :param file_id: if of file.
@@ -306,9 +305,7 @@ def _get_cloud_file(self, file_id: str, attributes: Iterable[str]) \
         :return: dict with attributes.
         """
         fields = f'{", ".join(attributes)}'
-        results = self._gdrive.files().get(
-            fileId=file_id, fields=fields).execute()
-        return results
+        return self._gdrive.files().get(fileId=file_id, fields=fields).execute()
 
     def _get_ignore_files(self) -> List[str]:
         """Get file patterns to ignore when publishing.
@@ -318,8 +315,8 @@ def _get_ignore_files(self) -> List[str]:
         patterns = []
         path = os.path.join(os.path.dirname(__file__), '.publishignore')
         with open(path, 'r') as file:
-            for line in file.readlines():
-                if line.strip() and not line.startswith('#'):
-                    patterns.append(line)
+            patterns.extend(
+                line for line in file if line.strip() and not line.startswith('#')
+            )
         logger.debug('Publish ignore files were loaded.')
         return patterns
diff --git a/utils/app_logger.py b/utils/app_logger.py
index 898d820..1413323 100644
--- a/utils/app_logger.py
+++ b/utils/app_logger.py
@@ -33,9 +33,7 @@ def formatTime(self, record: logging.LogRecord,
         :return: time in string format.
         """
         dt = self.converter(record.created)
-        if datefmt:
-            return dt.strftime(datefmt)
-        return dt.isoformat()
+        return dt.strftime(datefmt) if datefmt else dt.isoformat()
 
 
 def _get_file_handler(path: str) -> logging.FileHandler:
diff --git a/utils/smtp_sender.py b/utils/smtp_sender.py
index 49b5198..56231cf 100644
--- a/utils/smtp_sender.py
+++ b/utils/smtp_sender.py
@@ -58,8 +58,9 @@ def send(self, destination: str, subject: str,
                     file_attachment.set_payload(file_obj.read())
                     encoders.encode_base64(file_attachment)
                     file_attachment.add_header(
-                        f'Content-Disposition',
-                        f'attachment; filename="{file_name}"')
+                        'Content-Disposition',
+                        f'attachment; filename="{file_name}"',
+                    )
                     message.attach(file_attachment)
         text = message.as_string()