diff --git a/Makefile b/Makefile
index ac230122a7932654a09de9acd50aed37086df30a..b47f12f811b7bdc9f56dcc6b0f50242d17526810 100644
--- a/Makefile
+++ b/Makefile
@@ -20,9 +20,9 @@ mypy:
 
 # check code errors
 pylint:
-	pylint --disable=C,R0902,R0903,R0904,R0912,R0913,R0914,R0915,W0613 --enable=C0121,C0202,C0321 --jobs=0 duniterpy/
-	pylint --disable=C,R0902,R0903,R0904,R0912,R0913,R0914,R0915,W0613 --enable=C0121,C0202,C0321 --jobs=0 tests/
-	pylint --disable=C,R0902,R0903,R0904,R0912,R0913,R0914,R0915,W0613 --enable=C0121,C0202,C0321 --jobs=0 examples/
+	pylint --disable=C,R0902,R0903,R0904,R0912,R0913,R0914,R0915,W1202,W0613 --enable=C0121,C0202,C0321 --jobs=0 duniterpy/
+	pylint --disable=C,R0902,R0903,R0904,R0912,R0913,R0914,R0915,W1202,W0613 --enable=C0121,C0202,C0321 --jobs=0 tests/
+	pylint --disable=C,R0902,R0903,R0904,R0912,R0913,R0914,R0915,W1202,W0613 --enable=C0121,C0202,C0321 --jobs=0 examples/
 
 # check format
 check-format:
diff --git a/duniterpy/api/client.py b/duniterpy/api/client.py
index 922346a6390520301cb64f39556c5d8afea689ff..4644e932184d3f9fb84bcede7ccecedd8d8ce52f 100644
--- a/duniterpy/api/client.py
+++ b/duniterpy/api/client.py
@@ -274,12 +274,20 @@ class API:
                 error_data = parse_error(await response.text())
                 raise DuniterError(error_data)
             except (TypeError, jsonschema.ValidationError):
-                raise ValueError('status code != 200 => %d (%s)' % (response.status, (await response.text())))
+                raise ValueError(
+                    "status code != 200 => %d (%s)"
+                    % (response.status, (await response.text()))
+                )
 
         return response
 
-    async def requests(self, method: str = 'GET', path: str = '', data: Optional[dict] = None,
-                       _json: Optional[dict] = None) -> ClientResponse:
+    async def requests(
+        self,
+        method: str = "GET",
+        path: str = "",
+        data: Optional[dict] = None,
+        _json: Optional[dict] = None,
+    ) -> ClientResponse:
         """
         Generic requests wrapper on aiohttp
 
@@ -292,13 +300,13 @@ class API:
         url = self.reverse_url(self.connection_handler.http_scheme, path)
 
         if data is not None:
-            logging.debug("{0} : {1}, data={2}".format(method, url, data))
+            logging.debug("%s : %s, data=%s", method, url, data)
         elif _json is not None:
-            logging.debug("{0} : {1}, json={2}".format(method, url, _json))
+            logging.debug("%s : %s, json=%s", method, url, _json)
             # http header to send json body
-            self.headers['Content-Type'] = 'application/json; charset=utf-8'
+            self.headers["Content-Type"] = "application/json; charset=utf-8"
         else:
-            logging.debug("{0} : {1}".format(method, url))
+            logging.debug("%s : %s", method, url)
 
         response = await self.connection_handler.session.request(
             method,
@@ -307,7 +315,7 @@ class API:
             json=_json,
             headers=self.headers,
             proxy=self.connection_handler.proxy,
-            timeout=15
+            timeout=15,
         )
         return response
 
@@ -342,8 +350,12 @@ class Client:
     Main class to create an API client
     """
 
-    def __init__(self, _endpoint: Union[str, endpoint.Endpoint], session: Optional[ClientSession] = None,
-                 proxy: Optional[str] = None) -> None:
+    def __init__(
+        self,
+        _endpoint: Union[str, endpoint.Endpoint],
+        session: Optional[ClientSession] = None,
+        proxy: Optional[str] = None,
+    ) -> None:
         """
         Init Client instance
 
@@ -370,8 +382,13 @@ class Client:
             self.session = session
         self.proxy = proxy
 
-    async def get(self, url_path: str, params: Optional[dict] = None, rtype: str = RESPONSE_JSON,
-                  schema: Optional[dict] = None) -> Any:
+    async def get(
+        self,
+        url_path: str,
+        params: Optional[dict] = None,
+        rtype: str = RESPONSE_JSON,
+        schema: Optional[dict] = None,
+    ) -> Any:
         """
         GET request on endpoint host + url_path
 
@@ -403,8 +420,13 @@ class Client:
 
         return result
 
-    async def post(self, url_path: str, params: Optional[dict] = None, rtype: str = RESPONSE_JSON,
-                   schema: Optional[dict] = None) -> Any:
+    async def post(
+        self,
+        url_path: str,
+        params: Optional[dict] = None,
+        rtype: str = RESPONSE_JSON,
+        schema: Optional[dict] = None,
+    ) -> Any:
         """
         POST request on endpoint host + url_path
 
@@ -428,15 +450,21 @@ class Client:
             await parse_response(response, schema)
 
         # return the chosen type
-        if rtype == RESPONSE_AIOHTTP:
-            return response
-        elif rtype == RESPONSE_TEXT:
-            return await response.text()
+        result = response  # type: Any
+        if rtype == RESPONSE_TEXT:
+            result = await response.text()
         elif rtype == RESPONSE_JSON:
-            return await response.json()
+            result = await response.json()
+
+        return result
 
-    async def query(self, query: str, variables: Optional[dict] = None, rtype: str = RESPONSE_JSON,
-                    schema: Optional[dict] = None) -> Any:
+    async def query(
+        self,
+        query: str,
+        variables: Optional[dict] = None,
+        rtype: str = RESPONSE_JSON,
+        schema: Optional[dict] = None,
+    ) -> Any:
         """
         GraphQL query or mutation request on endpoint
 
@@ -446,17 +474,15 @@ class Client:
         :param schema: Json Schema to validate response (optional, default None)
         :return:
         """
-        payload = {
-            'query': query
-        }  # type: Dict[str, Union[str, dict]]
+        payload = {"query": query}  # type: Dict[str, Union[str, dict]]
 
         if variables is not None:
-            payload['variables'] = variables
+            payload["variables"] = variables
 
         client = API(self.endpoint.conn_handler(self.session, self.proxy))
 
         # get aiohttp response
-        response = await client.requests('POST', _json=payload)
+        response = await client.requests("POST", _json=payload)
 
         # if schema supplied...
         if schema is not None: