LITE-27567 Add black

* Double quotes replaced with single quotes

README.md

@@ -275,8 +275,9 @@ Development
 1. Python 3.8+
 2. Install poetry: `pip install poetry`
 3. Install dependencies: `poetry install`
-4. We use `isort` library to order and format our imports, and we check it using `flake8-isort` library (automatically on `flake8` run).  
-For convenience you may run `isort .` to order imports.
+4. We use `isort` library to order and format our imports, and `black` - to format the code. 
+We check it using `flake8-isort` and `flake8-black` libraries (automatically on `flake8` run).  
+For convenience you may run `isort . && black .` to format the code.
 5. Run flake8: `poetry run flake8`
 
 Testing

dj_rql/_dataclasses.py

@@ -21,8 +21,9 @@ def __init__(self, queryset, select_data, filter_tree, filter_node=None, filter_
 
 
 class FilterArgs:
-    def __init__(self, filter_name, operator, str_value, list_operator=None,
-                 namespace=None, **kwargs):
+    def __init__(
+        self, filter_name, operator, str_value, list_operator=None, namespace=None, **kwargs
+    ):
         """
         :param str filter_name: Full filter name (f.e. ns1.ns2.filter1)
         :param str operator: RQL operator (f.e. eq, like, etc.)

dj_rql/constants.py

@@ -48,7 +48,8 @@ class FilterTypes(FT):
     def field_filter_type(cls, field):
         return next(
             (
-                filter_type for base_cls, filter_type in cls.mapper
+                filter_type
+                for base_cls, filter_type in cls.mapper
                 if issubclass(field.__class__, base_cls)
             ),
             cls.STRING,

dj_rql/drf/backend.py

@@ -46,6 +46,7 @@ def get_rql_filter_class(self):
                 return ModelFilterClass
     ```
     """
+
     OPENAPI_RETRIEVE_SPECIFICATION = False
 
     _CACHES = {}
@@ -59,11 +60,13 @@ def filter_queryset(self, request, queryset, view):
         filter_instance = self._get_filter_instance(filter_class, queryset, view)
         query = self.get_query(filter_instance, request, view)
 
-        can_query_be_cached = all((
-            filter_class.QUERIES_CACHE_BACKEND,
-            filter_class.QUERIES_CACHE_SIZE,
-            request.method in ('GET', 'HEAD', 'OPTIONS'),
-        ))
+        can_query_be_cached = all(
+            (
+                filter_class.QUERIES_CACHE_BACKEND,
+                filter_class.QUERIES_CACHE_SIZE,
+                request.method in ('GET', 'HEAD', 'OPTIONS'),
+            ),
+        )
         if can_query_be_cached:
             # We must use the combination of queryset and query to make a cache key as
             #  queryset can already contain some filters (e.x. based on authentication)
@@ -117,7 +120,8 @@ def get_query(cls, filter_instance, request, view):
     def _get_or_init_cache(cls, filter_class, view):
         qual_name = cls._get_filter_cls_qual_name(view, filter_class)
         return cls._CACHES.setdefault(
-            qual_name, filter_class.QUERIES_CACHE_BACKEND(int(filter_class.QUERIES_CACHE_SIZE)),
+            qual_name,
+            filter_class.QUERIES_CACHE_BACKEND(int(filter_class.QUERIES_CACHE_SIZE)),
         )
 
     @classmethod
@@ -135,6 +139,8 @@ def _get_filter_instance(cls, filter_class, queryset, view):
     @staticmethod
     def _get_filter_cls_qual_name(view, filter_class):
         return '{0}.{1}+{2}.{3}'.format(
-            view.__class__.__module__, view.__class__.__name__,
-            filter_class.__module__, filter_class.__name__,
+            view.__class__.__module__,
+            view.__class__.__name__,
+            filter_class.__module__,
+            filter_class.__name__,
         )

dj_rql/drf/compat.py

@@ -28,6 +28,7 @@ class CompatibilityRQLFilterBackend(RQLFilterBackend):
     filter backend (without raising API version number or losing compatibility), this base
     compatibility DRF backend must be inherited from.
     """
+
     @classmethod
     def get_query(cls, filter_instance, request, view):
         try:
@@ -70,6 +71,7 @@ class DjangoFiltersRQLFilterBackend(CompatibilityRQLFilterBackend):
         * ?&& syntax in queries;
         * etc.
     """
+
     RESERVED_ORDERING_WORDS = {'order_by', 'ordering'}
 
     _POSSIBLE_DF_LOOKUPS = DJL.all()
@@ -161,7 +163,9 @@ def get_rql_query(cls, filter_instance, request, query_string):
             one_filter_value_pairs = []
             for value in request.query_params.getlist(filter_name):
                 name_value_pair = cls._get_one_filter_value_pair(
-                    filter_instance, filter_name, value,
+                    filter_instance,
+                    filter_name,
+                    value,
                 )
                 if name_value_pair is not None:
                     one_filter_value_pairs.append(name_value_pair)
@@ -202,7 +206,8 @@ def _convert_filter_to_rql(cls, filter_name, value):
 
         if lookup == DJL.IN:
             return 'in({0},({1}))'.format(
-                filter_base, ','.join(cls._add_quotes_to_value(v) for v in value.split(',') if v),
+                filter_base,
+                ','.join(cls._add_quotes_to_value(v) for v in value.split(',') if v),
             )
 
         if lookup == DJL.NULL:

dj_rql/drf/paginations.py

@@ -13,7 +13,7 @@
 
 
 class RQLLimitOffsetPagination(LimitOffsetPagination):
-    """ RQL limit offset pagination. """
+    """RQL limit offset pagination."""
 
     def __init__(self, *args, **kwargs):
         super(RQLLimitOffsetPagination, self).__init__(*args, **kwargs)
@@ -37,9 +37,11 @@ def paginate_queryset(self, queryset, request, view=None):
             try:
                 self._rql_limit, self._rql_offset = RQLLimitOffsetTransformer().transform(rql_ast)
             except LarkError:
-                raise RQLFilterParsingError(details={
-                    'error': 'Limit and offset are set incorrectly.',
-                })
+                raise RQLFilterParsingError(
+                    details={
+                        'error': 'Limit and offset are set incorrectly.',
+                    },
+                )
 
         self.limit = self.get_limit(request)
         if self.limit == 0:
@@ -62,7 +64,7 @@ def paginate_queryset(self, queryset, request, view=None):
         if self.limit + self.offset > self.count:
             self.limit = self.count - self.offset
 
-        return list(queryset[self.offset:self.offset + self.limit])
+        return list(queryset[self.offset : self.offset + self.limit])
 
     def get_limit(self, *args):
         if self._rql_limit is not None:
@@ -82,7 +84,7 @@ def get_offset(self, *args):
 
 
 class RQLContentRangeLimitOffsetPagination(RQLLimitOffsetPagination):
-    """ RQL RFC2616 limit offset pagination.
+    """RQL RFC2616 limit offset pagination.
 
     Examples:
         ```
@@ -96,6 +98,8 @@ class RQLContentRangeLimitOffsetPagination(RQLLimitOffsetPagination):
     def get_paginated_response(self, data):
         length = len(data) - 1 if data else 0
         content_range = 'items {0}-{1}/{2}'.format(
-            self.offset, self.offset + length, self.count,
+            self.offset,
+            self.offset + length,
+            self.count,
         )
         return Response(data, headers={'Content-Range': content_range})

dj_rql/drf/serializers.py

@@ -19,7 +19,7 @@ def apply_rql_select(self):
 
         for field_name, is_included in rql_select['select'].items():
             split_field_name = field_name.split('.')
-            is_current_level_field = (len(split_field_name) == 1)
+            is_current_level_field = len(split_field_name) == 1
             current_depth_field_name = split_field_name[0]
 
             if is_current_level_field:
@@ -48,8 +48,11 @@ def _get_deeper_rql_select(self):
 
     def _get_field_rql_select(self, field):
         take_parent = bool(
-            field.parent and getattr(field.parent, 'many', False) and isinstance(
-                field, field.parent.child.__class__,
+            field.parent
+            and getattr(field.parent, 'many', False)
+            and isinstance(
+                field,
+                field.parent.child.__class__,
             ),
         )
         if take_parent: