diff --git a/.vscode/settings.json b/.vscode/settings.json
index 057963ff..222fdba3 100644
--- a/.vscode/settings.json
+++ b/.vscode/settings.json
@@ -4,6 +4,7 @@
     ".pytest_cache/": true
   },
   "typescript.tsdk": "rsconcept/frontend/node_modules/typescript/lib",
+  "eslint.workingDirectories": ["rsconcept/frontend"],
   "isort.args": [
     "--line-length",
     "100",
@@ -12,10 +13,16 @@
     "--project",
     "apps"
   ],
-  "eslint.workingDirectories": ["rsconcept/frontend"],
+  "autopep8.args": [
+    "--max-line-length",
+    "120",
+    "--aggressive",
+    "--ignore",
+    "E303"
+  ],
   "[python]": {
-    "editor.formatOnSave": false,
     "editor.defaultFormatter": "ms-python.autopep8",
+    "editor.formatOnSave": true,
     "editor.tabSize": 4,
     "editor.insertSpaces": true,
     "editor.codeActionsOnSave": {
diff --git a/rsconcept/backend/apps/rsform/graph.py b/rsconcept/backend/apps/rsform/graph.py
index 30ea144f..4177840d 100644
--- a/rsconcept/backend/apps/rsform/graph.py
+++ b/rsconcept/backend/apps/rsform/graph.py
@@ -7,13 +7,14 @@ ItemType = TypeVar("ItemType")
 
 class Graph(Generic[ItemType]):
     ''' Directed graph. '''
-    def __init__(self, graph: Optional[dict[ItemType, list[ItemType]]]=None):
+
+    def __init__(self, graph: Optional[dict[ItemType, list[ItemType]]] = None):
         if graph is None:
             self.outputs: dict[ItemType, list[ItemType]] = {}
             self.inputs: dict[ItemType, list[ItemType]] = {}
         else:
             self.outputs = graph
-            self.inputs: dict[ItemType, list[ItemType]] = {id : [] for id in graph.keys()} #type: ignore[no-redef]
+            self.inputs: dict[ItemType, list[ItemType]] = {id: [] for id in graph.keys()}  # type: ignore[no-redef]
             for parent in graph.keys():
                 for child in graph[parent]:
                     self.inputs[child].append(parent)
diff --git a/rsconcept/backend/apps/rsform/messages.py b/rsconcept/backend/apps/rsform/messages.py
index d65d2b9a..16e47b69 100644
--- a/rsconcept/backend/apps/rsform/messages.py
+++ b/rsconcept/backend/apps/rsform/messages.py
@@ -1,41 +1,54 @@
 ''' Utility: Text messages. '''
 # pylint: skip-file
 
+
 def constituentaNotOwned(title: str):
     return f'Конституента не принадлежит схеме: {title}'
 
+
 def substitutionNotInList():
     return 'Отождествляемая конституента отсутствует в списке'
 
+
 def schemaNotOwned():
     return 'Нет доступа к схеме'
 
+
 def renameTrivial(name: str):
     return f'Имя должно отличаться от текущего: {name}'
 
+
 def substituteTrivial(name: str):
     return f'Отождествление конституенты с собой не корректно: {name}'
 
+
 def substituteDouble(name: str):
     return f'Повторное отождествление: {name}'
 
+
 def aliasTaken(name: str):
     return f'Имя уже используется: {name}'
 
+
 def pyconceptFailure():
     return 'Invalid data response from pyconcept'
 
+
 def typificationInvalidStr():
     return 'Invalid typification string'
 
+
 def libraryTypeUnexpected():
     return 'Attempting to use invalid adaptor for non-RSForm item'
 
+
 def exteorFileVersionNotSupported():
     return 'Некорректный формат файла Экстеор. Сохраните файл в новой версии'
 
+
 def invalidPosition():
     return 'Invalid position: should be positive integer'
 
+
 def constituentaNoStructure():
     return 'Указанная конституента не обладает теоретико-множественной типизацией'
diff --git a/rsconcept/backend/apps/rsform/models/Constituenta.py b/rsconcept/backend/apps/rsform/models/Constituenta.py
index 840b4d70..fe09a12f 100644
--- a/rsconcept/backend/apps/rsform/models/Constituenta.py
+++ b/rsconcept/backend/apps/rsform/models/Constituenta.py
@@ -17,7 +17,7 @@ from django.urls import reverse
 from ..utils import apply_pattern
 
 _REF_ENTITY_PATTERN = re.compile(r'@{([^0-9\-].*?)\|.*?}')
-_GLOBAL_ID_PATTERN = re.compile(r'([XCSADFPT][0-9]+)') # cspell:disable-line
+_GLOBAL_ID_PATTERN = re.compile(r'([XCSADFPT][0-9]+)')  # cspell:disable-line
 
 
 def _empty_forms():
diff --git a/rsconcept/backend/apps/rsform/models/api_RSForm.py b/rsconcept/backend/apps/rsform/models/api_RSForm.py
index f2af6014..e0c03e12 100644
--- a/rsconcept/backend/apps/rsform/models/api_RSForm.py
+++ b/rsconcept/backend/apps/rsform/models/api_RSForm.py
@@ -29,6 +29,7 @@ _INSERT_LAST: int = -1
 
 class RSForm:
     ''' RSForm is math form of conceptual schema. '''
+
     def __init__(self, item: LibraryItem):
         if item.item_type != LibraryItemType.RSFORM:
             raise ValueError(msg.libraryTypeUnexpected())
@@ -144,7 +145,7 @@ class RSForm:
         for (value, _) in CstType.choices:
             indices[value] = self.get_max_index(cast(CstType, value))
 
-        mapping: dict[str, str]  = {}
+        mapping: dict[str, str] = {}
         for cst in items:
             indices[cst.cst_type] = indices[cst.cst_type] + 1
             newAlias = f'{get_type_prefix(cst.cst_type)}{indices[cst.cst_type]}'
@@ -195,7 +196,7 @@ class RSForm:
         self.item.save()
 
     @transaction.atomic
-    def create_cst(self, data: dict, insert_after: Optional[str]=None) -> Constituenta:
+    def create_cst(self, data: dict, insert_after: Optional[str] = None) -> Constituenta:
         ''' Create new cst from data. '''
         resolver = self.resolver()
         cst = self._insert_new(data, insert_after)
@@ -224,7 +225,7 @@ class RSForm:
     ):
         ''' Execute constituenta substitution. '''
         assert original.pk != substitution.pk
-        mapping = { original.alias: substitution.alias }
+        mapping = {original.alias: substitution.alias}
         self.apply_mapping(mapping)
         if transfer_term:
             substitution.term_raw = original.term_raw
@@ -331,8 +332,8 @@ class RSForm:
             return
         update_list = \
             Constituenta.objects \
-                .only('id', 'order', 'schema') \
-                .filter(schema=self.item, order__gte=start)
+            .only('id', 'order', 'schema') \
+            .filter(schema=self.item, order__gte=start)
         for cst in update_list:
             cst.order += shift
         Constituenta.objects.bulk_update(update_list, ['order'])
@@ -350,7 +351,7 @@ class RSForm:
         if position == _INSERT_LAST:
             position = lastPosition + 1
         else:
-            position =  max(1, min(position, lastPosition + 1))
+            position = max(1, min(position, lastPosition + 1))
         return position
 
     @transaction.atomic
@@ -362,7 +363,7 @@ class RSForm:
                 cst.save()
             order += 1
 
-    def _insert_new(self, data: dict, insert_after: Optional[str]=None) -> Constituenta:
+    def _insert_new(self, data: dict, insert_after: Optional[str] = None) -> Constituenta:
         if insert_after is not None:
             cst_after = Constituenta.objects.get(pk=insert_after)
             return self.insert_new(data['alias'], data['cst_type'], cst_after.order + 1)
@@ -426,21 +427,22 @@ class RSForm:
 
 class SemanticInfo:
     ''' Semantic information derived from constituents. '''
+
     def __init__(self, schema: RSForm):
         self._graph = schema._graph_formal()
         self._items = list(
-            schema.constituents() \
-                .only('id', 'alias', 'cst_type', 'definition_formal') \
-                .order_by('order')
+            schema.constituents()
+            .only('id', 'alias', 'cst_type', 'definition_formal')
+            .order_by('order')
         )
-        self._cst_by_alias = { cst.alias : cst for cst in self._items }
-        self._cst_by_ID = { cst.id : cst for cst in self._items }
+        self._cst_by_alias = {cst.alias: cst for cst in self._items}
+        self._cst_by_ID = {cst.id: cst for cst in self._items}
         self.info = {
             cst.id: {
-                'is_simple' : False, \
-                'is_template' : False, \
-                'parent' : cst.id, \
-                'children' : [] 
+                'is_simple': False,
+                'is_template': False,
+                'parent': cst.id,
+                'children': []
             }
             for cst in self._items
         }
@@ -483,8 +485,8 @@ class SemanticInfo:
 
         dependencies = self._graph.inputs[target.id]
         has_complex_dependency = any(
-            self.is_template(cst_id) and \
-                not self.is_simple_expression(cst_id) for cst_id in dependencies
+            self.is_template(cst_id) and
+            not self.is_simple_expression(cst_id) for cst_id in dependencies
         )
         if has_complex_dependency:
             return False
@@ -534,11 +536,11 @@ class SemanticInfo:
 
                 parent_info = self[parent.id]
                 if not is_base_set(parent.cst_type) and \
-                    (not parent_info['is_template'] or not parent_info['is_simple']):
+                        (not parent_info['is_template'] or not parent_info['is_simple']):
                     sources.add(parent_info['parent'])
         return sources
 
-    def _need_check_head(self, sources: set[int], head: str)-> bool:
+    def _need_check_head(self, sources: set[int], head: str) -> bool:
         if len(sources) == 0:
             return True
         elif len(sources) != 1:
@@ -551,15 +553,16 @@ class SemanticInfo:
 
 class _OrderManager:
     ''' Ordering helper class '''
+
     def __init__(self, schema: RSForm):
         self._semantic = schema.semantic()
         self._graph = schema._graph_formal()
         self._items = list(
-            schema.constituents() \
-                .only('id', 'order', 'alias', 'cst_type', 'definition_formal') \
-                .order_by('order')
+            schema.constituents()
+            .only('id', 'order', 'alias', 'cst_type', 'definition_formal')
+            .order_by('order')
         )
-        self._cst_by_ID = { cst.id : cst for cst in self._items }
+        self._cst_by_ID = {cst.id: cst for cst in self._items}
 
     def restore_order(self) -> None:
         ''' Implement order restoration process. '''
@@ -579,9 +582,9 @@ class _OrderManager:
         result = [cst for cst in self._items if cst.cst_type == CstType.BASE]
         result = result + [cst for cst in self._items if cst.cst_type == CstType.CONSTANT]
         kernel = [
-            cst.id for cst in self._items if \
-                cst.cst_type in [CstType.STRUCTURED, CstType.AXIOM] or \
-                    self._cst_by_ID[self._semantic.parent(cst.id)].cst_type == CstType.STRUCTURED
+            cst.id for cst in self._items if
+            cst.cst_type in [CstType.STRUCTURED, CstType.AXIOM] or
+            self._cst_by_ID[self._semantic.parent(cst.id)].cst_type == CstType.STRUCTURED
         ]
         kernel = kernel + self._graph.expand_inputs(kernel)
         result = result + [cst for cst in self._items if result.count(cst) == 0 and cst.id in kernel]
@@ -604,7 +607,6 @@ class _OrderManager:
                     result.append(child)
         self._items = result
 
-
     @transaction.atomic
     def _save_order(self) -> None:
         order = 1
diff --git a/rsconcept/backend/apps/rsform/models/api_RSLanguage.py b/rsconcept/backend/apps/rsform/models/api_RSLanguage.py
index c92493b9..d32a8c4e 100644
--- a/rsconcept/backend/apps/rsform/models/api_RSLanguage.py
+++ b/rsconcept/backend/apps/rsform/models/api_RSLanguage.py
@@ -9,7 +9,7 @@ import pyconcept
 from .. import messages as msg
 from .Constituenta import CstType
 
-_RE_GLOBALS = r'[XCSADFPT]\d+' # cspell:disable-line
+_RE_GLOBALS = r'[XCSADFPT]\d+'  # cspell:disable-line
 _RE_TEMPLATE = r'R\d+'
 _RE_COMPLEX_SYMBOLS = r'[∀∃×ℬ;|:]'
 
@@ -34,7 +34,7 @@ def get_type_prefix(cst_type: CstType) -> str:
         case CstType.STRUCTURED: return 'S'
         case CstType.AXIOM: return 'A'
         case CstType.TERM: return 'D'
-        case CstType.FUNCTION:  return 'F'
+        case CstType.FUNCTION: return 'F'
         case CstType.PREDICATE: return 'P'
         case CstType.THEOREM: return 'T'
     return 'X'
@@ -140,9 +140,9 @@ def generate_structure(alias: str, expression: str, parse: dict) -> list:
     for (n, item) in enumerate(ast):
         if n == 0:
             generated.append({
-                'text': link, # generated text
-                'operation': None, # applied operation. None if text should be skipped
-                'is_boolean': False # is the result of operation has an additional boolean
+                'text': link,  # generated text
+                'operation': None,  # applied operation. None if text should be skipped
+                'is_boolean': False  # is the result of operation has an additional boolean
             })
             continue
 
@@ -150,7 +150,7 @@ def generate_structure(alias: str, expression: str, parse: dict) -> list:
         parent_type = ast[parent_index]['typeID']
         parent_text = generated[parent_index]['text']
         parent_is_boolean = generated[parent_index]['is_boolean']
-        assert(parent_type in [TokenType.BOOLEAN, TokenType.DECART])
+        assert parent_type in [TokenType.BOOLEAN, TokenType.DECART]
 
         if parent_is_boolean:
             if parent_type == TokenType.BOOLEAN:
diff --git a/rsconcept/backend/apps/rsform/serializers/basics.py b/rsconcept/backend/apps/rsform/serializers/basics.py
index c6980e19..40afd0a5 100644
--- a/rsconcept/backend/apps/rsform/serializers/basics.py
+++ b/rsconcept/backend/apps/rsform/serializers/basics.py
@@ -65,6 +65,7 @@ class ErrorDescriptionSerializer(serializers.Serializer):
         child=serializers.CharField()
     )
 
+
 class NodeDataSerializer(serializers.Serializer):
     ''' Serializer: Node data. '''
     dataType = serializers.CharField()
@@ -74,11 +75,11 @@ class NodeDataSerializer(serializers.Serializer):
 class ASTNodeSerializer(serializers.Serializer):
     ''' Serializer: Syntax tree node. '''
     uid = serializers.IntegerField()
-    parent = serializers.IntegerField() # type: ignore
+    parent = serializers.IntegerField()  # type: ignore
     typeID = serializers.IntegerField()
     start = serializers.IntegerField()
     finish = serializers.IntegerField()
-    data = NodeDataSerializer() # type: ignore
+    data = NodeDataSerializer()  # type: ignore
 
 
 class ExpressionParseSerializer(serializers.Serializer):
@@ -91,7 +92,7 @@ class ExpressionParseSerializer(serializers.Serializer):
     ast = serializers.ListField(
         child=ASTNodeSerializer()
     )
-    errors = serializers.ListField( # type: ignore
+    errors = serializers.ListField(  # type: ignore
         child=ErrorDescriptionSerializer()
     )
     args = serializers.ListField(
@@ -116,7 +117,7 @@ class ReferenceDataSerializer(serializers.Serializer):
 class ReferenceSerializer(serializers.Serializer):
     ''' Serializer: Language reference. '''
     type = serializers.CharField()
-    data = ReferenceDataSerializer() # type: ignore
+    data = ReferenceDataSerializer()  # type: ignore
     pos_input = TextPositionSerializer()
     pos_output = TextPositionSerializer()
 
diff --git a/rsconcept/backend/apps/rsform/serializers/data_access.py b/rsconcept/backend/apps/rsform/serializers/data_access.py
index 7b37b787..fe8c9ee4 100644
--- a/rsconcept/backend/apps/rsform/serializers/data_access.py
+++ b/rsconcept/backend/apps/rsform/serializers/data_access.py
@@ -88,12 +88,12 @@ class CstSerializer(serializers.ModelSerializer):
         read_only_fields = ('id', 'order', 'alias', 'cst_type', 'definition_resolved', 'term_resolved')
 
     def update(self, instance: Constituenta, validated_data) -> Constituenta:
-        data = validated_data # Note: use alias for better code readability
+        data = validated_data  # Note: use alias for better code readability
         schema = RSForm(instance.schema)
         definition: Optional[str] = data['definition_raw'] if 'definition_raw' in data else None
         term: Optional[str] = data['term_raw'] if 'term_raw' in data else None
         term_changed = 'term_forms' in data
-        if definition is not None and definition != instance.definition_raw :
+        if definition is not None and definition != instance.definition_raw:
             data['definition_resolved'] = schema.resolver().resolve(definition)
         if term is not None and term != instance.term_raw:
             data['term_resolved'] = schema.resolver().resolve(term)
@@ -368,7 +368,7 @@ class CstSubstituteSerializer(serializers.Serializer):
 class InlineSynthesisSerializer(serializers.Serializer):
     ''' Serializer: Inline synthesis operation input. '''
     receiver = PKField(many=False, queryset=LibraryItem.objects.all())
-    source = PKField(many=False, queryset=LibraryItem.objects.all()) # type: ignore
+    source = PKField(many=False, queryset=LibraryItem.objects.all())  # type: ignore
     items = PKField(many=True, queryset=Constituenta.objects.all())
     substitutions = serializers.ListField(
         child=CstSubstituteSerializerBase()
diff --git a/rsconcept/backend/apps/rsform/serializers/io_files.py b/rsconcept/backend/apps/rsform/serializers/io_files.py
index d2e906d3..8dc3783a 100644
--- a/rsconcept/backend/apps/rsform/serializers/io_files.py
+++ b/rsconcept/backend/apps/rsform/serializers/io_files.py
@@ -12,6 +12,7 @@ _TRS_VERSION_MIN = 16
 _TRS_VERSION = 16
 _TRS_HEADER = 'Exteor 4.8.13.1000 - 30/05/2022'
 
+
 class FileSerializer(serializers.Serializer):
     ''' Serializer: File input. '''
     file = serializers.FileField(allow_empty_file=False)
@@ -25,6 +26,7 @@ class RSFormUploadSerializer(serializers.Serializer):
 
 class RSFormTRSSerializer(serializers.Serializer):
     ''' Serializer: TRS file production and loading for RSForm. '''
+
     def to_representation(self, instance: RSForm) -> dict:
         result = self._prepare_json_rsform(instance)
         items = instance.constituents().order_by('order')
@@ -115,7 +117,7 @@ class RSFormTRSSerializer(serializers.Serializer):
         if self.context['load_meta']:
             result['title'] = data.get('title', 'Без названия')
             result['alias'] = data.get('alias', '')
-            result['comment']= data.get('comment', '')
+            result['comment'] = data.get('comment', '')
         if 'id' in data:
             result['id'] = data['id']
             self.instance = RSForm(LibraryItem.objects.get(pk=result['id']))
diff --git a/rsconcept/backend/apps/rsform/serializers/io_pyconcept.py b/rsconcept/backend/apps/rsform/serializers/io_pyconcept.py
index cad69f3a..1aa79820 100644
--- a/rsconcept/backend/apps/rsform/serializers/io_pyconcept.py
+++ b/rsconcept/backend/apps/rsform/serializers/io_pyconcept.py
@@ -10,6 +10,7 @@ from ..models import RSForm
 
 class PyConceptAdapter:
     ''' RSForm adapter for interacting with pyconcept module. '''
+
     def __init__(self, data: Union[RSForm, dict]):
         try:
             if 'items' in cast(dict, data):
diff --git a/rsconcept/backend/apps/rsform/serializers/schema_typing.py b/rsconcept/backend/apps/rsform/serializers/schema_typing.py
index 0f70c5d4..43ff4e53 100644
--- a/rsconcept/backend/apps/rsform/serializers/schema_typing.py
+++ b/rsconcept/backend/apps/rsform/serializers/schema_typing.py
@@ -14,6 +14,7 @@ class NewCstResponse(serializers.Serializer):
     new_cst = serializers.IntegerField()
     schema = RSFormParseSerializer()
 
+
 class NewMultiCstResponse(serializers.Serializer):
     ''' Serializer: Create multiple cst response. '''
     cst_list = serializers.ListField(
@@ -21,6 +22,7 @@ class NewMultiCstResponse(serializers.Serializer):
     )
     schema = RSFormParseSerializer()
 
+
 class NewVersionResponse(serializers.Serializer):
     ''' Serializer: Create cst response. '''
     version = serializers.IntegerField()
diff --git a/rsconcept/backend/apps/rsform/tests/s_models/t_Constituenta.py b/rsconcept/backend/apps/rsform/tests/s_models/t_Constituenta.py
index 83b722a7..fe22be46 100644
--- a/rsconcept/backend/apps/rsform/tests/s_models/t_Constituenta.py
+++ b/rsconcept/backend/apps/rsform/tests/s_models/t_Constituenta.py
@@ -8,6 +8,7 @@ from apps.rsform.models import Constituenta, CstType, LibraryItem, LibraryItemTy
 
 class TestConstituenta(TestCase):
     ''' Testing Constituenta model. '''
+
     def setUp(self):
         self.schema1 = LibraryItem.objects.create(item_type=LibraryItemType.RSFORM, title='Test1')
         self.schema2 = LibraryItem.objects.create(item_type=LibraryItemType.RSFORM, title='Test2')
diff --git a/rsconcept/backend/apps/rsform/tests/s_models/t_LibraryItem.py b/rsconcept/backend/apps/rsform/tests/s_models/t_LibraryItem.py
index bfcdbf30..8b35e29d 100644
--- a/rsconcept/backend/apps/rsform/tests/s_models/t_LibraryItem.py
+++ b/rsconcept/backend/apps/rsform/tests/s_models/t_LibraryItem.py
@@ -6,6 +6,7 @@ from apps.rsform.models import LibraryItem, LibraryItemType, Subscription, User
 
 class TestLibraryItem(TestCase):
     ''' Testing LibraryItem model. '''
+
     def setUp(self):
         self.user1 = User.objects.create(username='User1')
         self.user2 = User.objects.create(username='User2')
diff --git a/rsconcept/backend/apps/rsform/tests/s_models/t_RSForm.py b/rsconcept/backend/apps/rsform/tests/s_models/t_RSForm.py
index a6f4a369..c7cc2fff 100644
--- a/rsconcept/backend/apps/rsform/tests/s_models/t_RSForm.py
+++ b/rsconcept/backend/apps/rsform/tests/s_models/t_RSForm.py
@@ -7,6 +7,7 @@ from apps.rsform.models import Constituenta, CstType, RSForm, User
 
 class TestRSForm(TestCase):
     ''' Testing RSForm wrapper. '''
+
     def setUp(self):
         self.user1 = User.objects.create(username='User1')
         self.user2 = User.objects.create(username='User2')
@@ -81,7 +82,7 @@ class TestRSForm(TestCase):
     def test_insert_at_reorder(self):
         self.schema.insert_new('X1')
         d1 = self.schema.insert_new('D1')
-        d2 = self.schema.insert_new('D2',position=1)
+        d2 = self.schema.insert_new('D2', position=1)
         d1.refresh_from_db()
         self.assertEqual(d1.order, 3)
         self.assertEqual(d2.order, 1)
@@ -108,7 +109,7 @@ class TestRSForm(TestCase):
             definition_raw='@{X1|datv} @{X2|datv}'
         )
         x2 = self.schema.create_cst({
-            'alias': 'X2', 
+            'alias': 'X2',
             'cst_type': CstType.BASE,
             'term_raw': 'слон',
             'definition_raw': '@{X1|plur} @{X2|plur}'
@@ -161,7 +162,7 @@ class TestRSForm(TestCase):
             convention='X1',
             term_raw='@{X1|plur}'
         )
-    
+
         self.schema.apply_mapping({x1.alias: 'X3', x2.alias: 'X4'})
         d1.refresh_from_db()
         self.assertEqual(d1.definition_formal, 'X3 = X4 = X2', msg='Map IDs in expression')
@@ -260,7 +261,7 @@ class TestRSForm(TestCase):
             alias='F2',
             definition_formal=r'[α∈ℬ(X1)] X1\α',
         )
-        
+
         self.schema.restore_order()
         x1.refresh_from_db()
         x2.refresh_from_db()
@@ -345,8 +346,8 @@ class TestRSForm(TestCase):
             definition_resolved='очень сильный человек'
         )
 
-        x1.term_raw='слон'
-        x1.term_resolved='слон'
+        x1.term_raw = 'слон'
+        x1.term_resolved = 'слон'
         x1.save()
 
         self.schema.on_term_change([x1.id])
diff --git a/rsconcept/backend/apps/rsform/tests/t_graph.py b/rsconcept/backend/apps/rsform/tests/t_graph.py
index 314e6dac..63713f95 100644
--- a/rsconcept/backend/apps/rsform/tests/t_graph.py
+++ b/rsconcept/backend/apps/rsform/tests/t_graph.py
@@ -6,7 +6,7 @@ from apps.rsform.graph import Graph
 
 class TestGraph(unittest.TestCase):
     ''' Test class for graph. '''
-    
+
     def test_construction(self):
         graph = Graph()
         self.assertFalse(graph.contains(1))
diff --git a/rsconcept/backend/apps/rsform/tests/t_utils.py b/rsconcept/backend/apps/rsform/tests/t_utils.py
index d59d3d71..27f0d1de 100644
--- a/rsconcept/backend/apps/rsform/tests/t_utils.py
+++ b/rsconcept/backend/apps/rsform/tests/t_utils.py
@@ -8,7 +8,6 @@ from apps.rsform.utils import apply_pattern, fix_old_references
 class TestUtils(unittest.TestCase):
     ''' Test various utility functions. '''
 
-
     def test_apply_mapping_patter(self):
         mapping = {'X101': 'X20'}
         pattern = re.compile(r'(X[0-9]+)')
diff --git a/rsconcept/backend/apps/rsform/utils.py b/rsconcept/backend/apps/rsform/utils.py
index 2b37d33a..b5e73e1f 100644
--- a/rsconcept/backend/apps/rsform/utils.py
+++ b/rsconcept/backend/apps/rsform/utils.py
@@ -15,16 +15,18 @@ _REF_OLD_PATTERN = re.compile(r'@{([^0-9\-][^\}\|\{]*?)\|([^\}\|\{]*?)\|([^\}\|\
 
 class ObjectOwnerOrAdmin(BasePermission):
     ''' Permission for object ownership restriction '''
+
     def has_object_permission(self, request, view, obj):
         if request.user == obj.owner:
             return True
         if not hasattr(request.user, 'is_staff'):
             return False
-        return request.user.is_staff # type: ignore
+        return request.user.is_staff  # type: ignore
 
 
 class IsClaimable(IsAuthenticated):
     ''' Permission for object ownership restriction '''
+
     def has_object_permission(self, request, view, obj):
         if not super().has_permission(request, view):
             return False
@@ -33,22 +35,24 @@ class IsClaimable(IsAuthenticated):
 
 class SchemaOwnerOrAdmin(BasePermission):
     ''' Permission for object ownership restriction '''
+
     def has_object_permission(self, request, view, obj):
         if request.user == obj.schema.owner:
             return True
         if not hasattr(request.user, 'is_staff'):
             return False
-        return request.user.is_staff # type: ignore
+        return request.user.is_staff  # type: ignore
 
 
 class ItemOwnerOrAdmin(BasePermission):
     ''' Permission for object ownership restriction '''
+
     def has_object_permission(self, request, view, obj):
         if request.user == obj.item.owner:
             return True
         if not hasattr(request.user, 'is_staff'):
             return False
-        return request.user.is_staff # type: ignore
+        return request.user.is_staff  # type: ignore
 
 
 def read_zipped_json(data, json_filename: str) -> dict:
@@ -77,11 +81,11 @@ def apply_pattern(text: str, mapping: dict[str, str], pattern: re.Pattern[str])
     for segment in re.finditer(pattern, text):
         entity = segment.group(1)
         if entity in mapping:
-            output += text[pos_input : segment.start(1)]
+            output += text[pos_input: segment.start(1)]
             output += mapping[entity]
-            output += text[segment.end(1) : segment.end(0)]
+            output += text[segment.end(1): segment.end(0)]
             pos_input = segment.end(0)
-    output += text[pos_input : len(text)]
+    output += text[pos_input: len(text)]
     return output
 
 
@@ -92,10 +96,10 @@ def fix_old_references(text: str) -> str:
     pos_input: int = 0
     output: str = ''
     for segment in re.finditer(_REF_OLD_PATTERN, text):
-        output += text[pos_input : segment.start(0)]
+        output += text[pos_input: segment.start(0)]
         output += f'@{{{segment.group(1)}|{segment.group(2)},{segment.group(3)}}}'
         pos_input = segment.end(0)
-    output += text[pos_input : len(text)]
+    output += text[pos_input: len(text)]
     return output
 
 
diff --git a/rsconcept/backend/apps/rsform/views/rsforms.py b/rsconcept/backend/apps/rsform/views/rsforms.py
index f8a7b56d..c206828a 100644
--- a/rsconcept/backend/apps/rsform/views/rsforms.py
+++ b/rsconcept/backend/apps/rsform/views/rsforms.py
@@ -90,12 +90,12 @@ class RSFormViewSet(viewsets.GenericViewSet, generics.ListAPIView, generics.Retr
         cst = cast(m.Constituenta, serializer.validated_data['target'])
 
         schema_details = s.RSFormParseSerializer(schema.item).data['items']
-        cst_parse = next(item for item in schema_details if item['id']==cst.id)['parse']
+        cst_parse = next(item for item in schema_details if item['id'] == cst.id)['parse']
         if not cst_parse['typification']:
             return Response(
-            status=c.HTTP_400_BAD_REQUEST,
-            data={f'{cst.id}': msg.constituentaNoStructure()}
-        )
+                status=c.HTTP_400_BAD_REQUEST,
+                data={f'{cst.id}': msg.constituentaNoStructure()}
+            )
 
         result = schema.produce_structure(cst, cst_parse)
         return Response(
@@ -131,7 +131,7 @@ class RSFormViewSet(viewsets.GenericViewSet, generics.ListAPIView, generics.Retr
         cst.cst_type = serializer.validated_data['cst_type']
         cst.save()
 
-        mapping = { old_alias: cst.alias }
+        mapping = {old_alias: cst.alias}
         schema.apply_mapping(mapping, change_aliases=False)
         schema.item.refresh_from_db()
         cst.refresh_from_db()
@@ -350,7 +350,7 @@ class RSFormViewSet(viewsets.GenericViewSet, generics.ListAPIView, generics.Retr
         serializer = s.ExpressionSerializer(data=request.data)
         serializer.is_valid(raise_exception=True)
         expression = serializer.validated_data['expression']
-        schema =  s.PyConceptAdapter(self._get_schema())
+        schema = s.PyConceptAdapter(self._get_schema())
         result = pyconcept.check_expression(json.dumps(schema.data), expression)
         return Response(
             status=c.HTTP_200_OK,
diff --git a/rsconcept/backend/apps/rsform/views/versions.py b/rsconcept/backend/apps/rsform/views/versions.py
index 3159444e..bf7e21d6 100644
--- a/rsconcept/backend/apps/rsform/views/versions.py
+++ b/rsconcept/backend/apps/rsform/views/versions.py
@@ -121,14 +121,14 @@ def retrieve_version(request: Request, pk_item: int, pk_version: int):
 
 
 @extend_schema(
-        summary='export versioned data as file',
-        tags=['Version'],
-        request=None,
-        responses={
-            (c.HTTP_200_OK, 'application/zip'): bytes,
-            c.HTTP_404_NOT_FOUND: None
-        }
-    )
+    summary='export versioned data as file',
+    tags=['Version'],
+    request=None,
+    responses={
+        (c.HTTP_200_OK, 'application/zip'): bytes,
+        c.HTTP_404_NOT_FOUND: None
+    }
+)
 @api_view(['GET'])
 def export_file(request: Request, pk: int):
     ''' Endpoint: Download Exteor compatible file for versioned data. '''
diff --git a/rsconcept/backend/apps/users/messages.py b/rsconcept/backend/apps/users/messages.py
index b4d6fc2d..a99495fb 100644
--- a/rsconcept/backend/apps/users/messages.py
+++ b/rsconcept/backend/apps/users/messages.py
@@ -1,8 +1,10 @@
 ''' Utility: Text messages. '''
 # pylint: skip-file
 
+
 def passwordAuthFailed():
     return 'Неизвестное сочетание имени пользователя и пароля'
 
+
 def passwordsNotMatch():
     return 'Введенные пароли не совпадают'
diff --git a/rsconcept/backend/apps/users/models.py b/rsconcept/backend/apps/users/models.py
index 8bf01a73..510b504b 100644
--- a/rsconcept/backend/apps/users/models.py
+++ b/rsconcept/backend/apps/users/models.py
@@ -1,4 +1,4 @@
-''' Models: User profile and Authentification. '''
+''' Models: User profile and Authorization. '''
 
 # Note: using User import to isolate original
 # pylint: disable=unused-import,ungrouped-imports
diff --git a/rsconcept/backend/project/settings.py b/rsconcept/backend/project/settings.py
index 86f5fa1f..7abd0854 100644
--- a/rsconcept/backend/project/settings.py
+++ b/rsconcept/backend/project/settings.py
@@ -23,6 +23,7 @@ def _get_secret(key: str, default):
             return f.read()
     return value
 
+
 _TRUE_VARIANTS = [True, 'True', '1']
 
 # Build paths inside the project like this: BASE_DIR / 'subdir'.